Need java help
hi, i hope this is the right place to put this question. i have a optiplex gxi with a 3geg. hardrive. and 64mb of ram.with windows me. when i download java to play on pogo the games will load but they drag and freeze up. the only java download i can get is jre 5.0 update 16 i think i have uninstalled it compleatly.because i keep getting all kinds of errors one i get is ie6 will hang and i get a send to microsoft error report. when i try to update java i get an error number 1723 windows installer error. i can not update the windows installer or even download net framework. please can someone help. (i miss pogo) i have tried to install msjvm but that doesn't work either. sorry for my typeing skills i hope you can help thank you.
brightsmile29 wrote:
thank you for your reply however my computer is not compatable with ie7 i have windows me. whice is not supported. and i can not download java so therefore i have no java installed. any help would be gratefull.That ME based system is beyond it's life span at this point in time. You can use JRE's that were developed about that time--Up to 1.4x (I think, you may get away with early 5).
So basically you have to face reality--that OS, machine, and JVM's have fallen off the grid for the most current games.
If you have completely uninstalled Java, then run regclean several times and then load the last usable version of Java that you have had installed in the past--and realize, the newer stuff is not made for that era of machine.
Similar Messages
-
I am a VB programmer and have started to learn Java a little bit. I need this program to be written anytime by Monday, but it must be written in java because they plan to use it on multiple platforms. Our java programmer quit and I don't know enough to write it in java. The program is to figure payroll. The user will input their name and remove the check in the hourly check box if they are salaried. If the employee is hourly, then any hours worked over 40 are time and a half. If they are salaried, they must choose what company level they are. I have included the three salary levels below. The program then needs to print to the screen in the bottom text box their yearly salary computed for a 40 hour work week. Can anyone help me and write the program? Whoever will do this for me, I will award 34 duke dollars. That is all I have.
Thank you so much for your help,
Kori
Name:
Text box here for name
(check box) Hourly
Hours:
Text box here for hours
(option button) Level 1
(option button) Level 2
(option button) Level 3
(option button) Level A
(option button) Level B
Total Pay:
Number Processed:
(command button) (command button)
Calculate Pay__________Clear
(text box)
shows "payoll report"
Level 1 = 6.25f
Level 2 = 8.15f
Level 3 = 10.85f
Level A = 27000f
Level B = 42000f
Max hours is 80.0fI am a VB programmer and have started to learn Java a
little bit. I need this program to be written anytime
by Monday, but it must be written in java because they
plan to use it on multiple platforms.Do this this little toy program in VB so you have a working solution on one platform by Monday. Show it to your boss and say you did a rapid prototype first for people to evaluate. Then take your time and convert it to Java.
/Ulrika the pragmatical. -
Oracle developer needs Java help
I develop applications in Oracle 8i on NT4. As part of a trigger, I need to perform an update to an extremely large table which takes many minutes. Because it's tied to a web page, I can't wait for the update to complete. Oracle natively doesn't support system calls -- I use the Shell() command in VB -- but Oracle DOES support Java stored procedures. I'm hoping that a Java stored procedure will be able to spawn/execute a new process/program specified by a command line instruction (ie: "C:\SQLPLUS.EXE SCOTT/TIGER @update.sql") and return immediately - without waiting for the process to complete. There doesn't need to be any handle for or call back from the process - just fire and forget. Can anyone provide me some direction, or better some existing Java code that does this? THANKS!
Hi "todmcg",
I'm not sure that I have understood your question correctly, but here goes anyway...
Yes you can create a java stored procedure and have a trigger execute that procedure. In order to execute system commands in java, you usually use the "exec()" method of class "java.lang.Runtime". It is also easy to spawn new threads using java. So yes, you can have your java stored procedure execute a system command in a background thread.
In my opinion, the Oracle documentation explains very well how to create a java stored procedure. The documentation is available from:
http://tahiti.oracle.com
Also, examples of how to call system commands from java stored procedures are available at this Web site:
http://asktom.oracle.com
You may also find relevant information at:
http://metalink.oracle.com
and
http://technet.oracle.com
Of-course, you can also use JDBC from your java stored procedure to execute your "update.sql" script -- without the need to execute a system command.
Basic code skeleton:
[NOTE: Untested and may contain syntax errors.]
public class SystemCommand implements Runnable {
private static String cmd;
public void run() {
Runtime runtime = Runtime.getRuntime();
runtime.exec(cmd);
public static void execCommand(String cmd) {
this.cmd = cmd;
new Thread(new SystemCommand()).start();
}Hope this helps you.
Good Luck,
Avi. -
Ive never visited a Java forum other than this one and its been over 2 years now. Out of curiosity I just went to JavaRanch.
Ive seen a lot of heated flaming from both sides (on these forums)
but i figured id take a look today.
The FIRST post i look at someone asks what the purpose of an
interface is and one of the responses he gets is:
"Please revise your display name to meet the JavaRanch Naming Policy. To maintain the friendly atmosphere here at the ranch, we like folks to use real (or at least real-looking) names, with a first and a last name.
You can edit your display name here. Thank you for your prompt attention!"
i wish i could go to 33 pt font: WTF IS THAT?
WEIRD!
Thats just way to creepy for me and im out... as if the brown and the
meesen (brian regan joke) everywhere werent enough.
Anyone know any other good ones?
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=33&t=019908JavaRanch scares me as well. Yea i think the ranch is making an army of cattle.
Ill check out devshed.
http://www.javaranch.com/name.jsp
SO F*CKING SCARY:
"I understand that in some cultures there is no such thing as "first name and last name" - there is just one name. If you are one of these people, I WOULD LIKE TO HUMBLY ASK YOU TO SACRIFICE A PIECE OF YOUR CULTURE to help me build this culture."
apparently the cows love the policy though:
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=10&t=001017 -
Hi,
I have used Captivate for a while, but have no idea where to
begin to insert JavaScript into Captivate. Everyone talks about it,
but I can't find a very basic beginner explanation for this. I
don't even know WHERE to put the JavaScript.Dear Altruistic
Thanks for the link to the Netbeans quickstart webpage sadly it does not contain any visual cues as to what proceedures are neccessary to implement the instructions.
For someone like me ( learning disability) this can cause difficulties I learn in a slightly different way to those who are able to assimilate written instructions.
The text might as well have been ancient Greek ...
I really need a discriptive walk through lets give an exampleso you will understand my needs ... say I wanted to open a Microsoft word document on the desktop of a windows PC (ok not a good choice but there you are ) here is how I would begin to write the proceedure
1. look at the bottom left hand side of your screen
can you see a windows symbol with start displayed ?
yes ..
Hold your mouse over the start icon and left click .. then use the cascading menu feature to select office 2003 ...
Do you get the general idea about what I need here ....?
So have a look at the link on my original post that points to David Eck's website where he lists some Java source code and if possible give me the proceedure of how to run this from within the Netbeans environment.
Once I can do this I will be able to teach myself ....
I guess in a nutshell what I am saying is why on earth is their not just a simple feature on the GUI that allows you to import some code and for Netbeans to run in Demo mode ! I know their is sample projects included within the application but here again this does not solve my problem of notbeing able to find a way to run source code from the application.
I hope this makes sense ! -
Need Java Help on a Mortgage program
I keep getting the following error.
java:20: illegal start of expression
public Scanner myScanner = new Scanner(System.in);
/*Danielle Safonte*/
/* Week 2 Mortgage Calculator*/
import java.util.Scanner;
import java.io.*;
import java.text.*;
public class Week2Assignment
int principle = 200000;
float interest = .0575;
int term = 30;
int months;
float paymentdue;
float calculation;
public static void months()
public Scanner myScanner = new Scanner(System.in);
System.out.print("What month of the loan is this?" + months);
if (months = term) {
System.out.print("You have paid off your loan");
else
months = myScanner.next();
float Jinterest = (interest / (months*100));
calculation = principle * (Jinterest/(1-(1+Jinterest)^(-months))); /*Monthly payment*/
float Minterest = principle * Jinterest; /*This months interest*/
float Mprinciple = calculation - Minterest; /*This months principle*/
float newBalance = principle - Mprinciple; /*This calculates the new principle*/
if (newBalance = princple) {
System.out.print("You have paid off your loan");
else
System.out.print("This months payment is: $", calculation); /*Displays the current months payment*/
System.out.print("You have $", newBalance," left on your loan"); /*Displays the new principle balance*/
System.out.print("This months principle is: $", Mprinciple ); /*Displays the new principle balance*/
}It is in my post at 10:02, but here it is again:
These are the errors that I am left with. I worked through the rest.
.java:29: '.class' expected
months = myScanner.next(int);
^
.java:29: ')' expected
months = myScanner.next(int);
^
2 errors
Tool completed with exit code 1
import java.util.Scanner;
import java.io.*;
import java.text.*;
public class Week2Assignment
int principle = 200000;
double interest = .0575;
int term = 30;
int months;
float paymentdue;
float calculation;
public void months()
Scanner myScanner = new Scanner(System.in);
System.out.print("What month of the loan is this?" + months);
if (months == term) {
System.out.print("You have paid off your loan");
else
months = myScanner.next(int);
double Jinterest = (interest / (months*100));
calculation = principle * (Jinterest/(1-(1+Jinterest)^(-months))); /*Monthly payment*/
float Minterest = principle * Jinterest; /*This months interest*/
float Mprinciple = calculation - Minterest; /*This months principle*/
float newBalance = principle - Mprinciple; /*This calculates the new principle*/
if (newBalance == princple) {
System.out.print("You have paid off your loan");
else
System.out.print("This months payment is: $", calculation); /*Displays the current months payment*/
System.out.print("You have $", newBalance," left on your loan"); /*Displays the new principle balance*/
System.out.print("This months principle is: $", Mprinciple ); /*Displays the new principle balance*/
} -
Urgent help needed(java frames)
Hi,
I need urgent help for correcting a piece of code.
I have written a piece of code for building a gui with some buttons, drawing some geometric shapes.The code consists of two files called Graph and Frame.
The problem I suppose in the last part of the Graph file, which Rectangle and Circle are called together, the only shape that the program draws is rectangle.Here is the code:
//Graph
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;
public class Graph extends JPanel {
LinkedList color;
LinkedList figures;
public Graph() {
setBackground(Color.white);
figures = new LinkedList();
color = new LinkedList();
int z;
class Point {
int x;
int y;
public Point(int x, int y) {
this.x = x;
this.y = y;
public Point(Point p) {
x = p.x;
y = p.y;
public String toString() {
return "(" + x + ", " + y + ")";
public void move(Point dist) {
x += dist.x;
y += dist.y;
abstract class GeomFigur {
public abstract void move(Point p);
class Line extends GeomFigur {
Point p1, p2;
public Line(Point p1, Point p2) {
this.p1 = new Point(p1);
this.p2 = new Point(p2);
public String toString() { return "Line from " + p1 + " to " + p2; }
public void move(Point dist) {
p1.move(dist);
p2.move(dist);
class Rectangle extends Line {
public Rectangle(Point p1, Point p2) {
super(p1, p2);
public String toString() { return "Rectangle from " + p1 + " to " + p2; }
class Circle extends GeomFigur{
Point centre;
int radius;
public Circle(Point centre, int radius) {
this.centre = new Point(centre);
this.radius = radius;
public String toString() {
return "Circle, centre " + centre + ", radius " + radius;
public void move(Point dist) { centre.move(dist); }
public void addRectangle(int x, int y, Color col) {
Rectangle r =new Rectangle(new Point(x,y),new Point(x+20,y+20));
figures.addLast(r);
color.addLast(col);
repaint();
public void addCircle(int x, int y, Color col) {
Circle c =new Circle(new Point(x,y), 1 );
figures.addLast(c);
color.addLast(col);
repaint();
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i=0;i < figures.size();i++) {
Rectangle rect = (Rectangle)figures.get(i);
//Circle circ = (Circle)figures.get(i);
g.setColor(Color.black);
g.drawRect(rect.p1.x,rect.p1.y,20,20);
g.setColor((Color)color.get(i));
g.fillRect(rect.p1.x,rect.p1.y,20,20);
//g.setColor(Color.black);
// g.drawOval(circ.centre.x,circ.centre.y,20,20);
// g.setColor((Color)color.get(i));
// g.fillOval(circ.centre.x, circ.centre.y, 20, 20);
//Frame
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Frame extends JFrame implements ActionListener {
JButton button1, button2, button3, button4, button5 ;
Graph gr;
JComboBox cbx;
JComboBox cby;
JComboBox col;
JMenu filemenu;
JMenuItem quit;
JMenuBar menubar;
int x=10;
int y=10;
Color color=Color.red;
public Frame() {
menubar = new JMenuBar();
filemenu = new JMenu("File");
filemenu.setMnemonic('F');
quit = new JMenuItem("Quit");
quit.addActionListener(this);
quit.setMnemonic('Q');
quit.setAccelerator(KeyStroke.getKeyStroke('Q',Event.CTRL_MASK,false));
filemenu.add(quit);
menubar.add(filemenu);
setJMenuBar(menubar);
button1 = new JButton("Rectangle");
button1.addActionListener(this);
button2 = new JButton("Circle");
button2.addActionListener(this);
button4 = new JButton("Ellipse");
button4.addActionListener(this);
button5 = new JButton("Triangle");
button5.addActionListener(this);
button3 = new JButton("Reset");
button3.addActionListener(this);
String[] elements_x= {"10","20","30","40","50","60","70"};
cbx = new JComboBox(elements_x);
cbx.addActionListener(this);
cbx.setActionCommand("cbx");
String[] elements_y= {"10","20","30","40","50","60","70"};
cby = new JComboBox(elements_y);
cby.addActionListener(this);
cby.setActionCommand("cby");
String[] elements_color = {"Red","Blue","Green","Orange","Yellow" };
col = new JComboBox(elements_color);
col.addActionListener(this);
col.setActionCommand("col");
gr = new Graph();
JPanel top = new JPanel(new BorderLayout());
JPanel inputs = new JPanel(new GridLayout(6,1));
inputs.add(button1);
inputs.add(button2);
inputs.add(button3);
inputs.add(button4);
inputs.add(button5);
inputs.add(cbx);
inputs.add(cby);
inputs.add(col);
top.add(gr,BorderLayout.CENTER);
top.add(inputs,BorderLayout.WEST);
getContentPane().add(BorderLayout.CENTER, top);
setSize(500,300);//set window size
//take care of actions
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.equals("Quit")){
System.exit(0);//terminate program
else if (command.equals("Rectangle")){
//add Rectangle to graph at
//position x,y and with certain color
gr.addRectangle(x,y,color);
else if (command.equals("Circle")){
gr.addCircle(x,y,color);
else if (command.equals("Reset")){
else if (command.equals("Triangle")){
else if (command.equals("Ellipse")){
else if (command.equals("cbx")){
x=Integer.valueOf((String)((JComboBox)e.getSource()).getSelectedItem()).intValue();
else if (command.equals("cby")){
y=Integer.valueOf((String)((JComboBox)e.getSource()).getSelectedItem()).intValue();
else if (command.equals("col")){
String temp=(String)((JComboBox)e.getSource()).getSelectedItem();
if (temp=="Red") color=Color.red;
else if (temp=="Blue") color=Color.blue;
else if (temp=="Green") color=Color.green;
else if (temp=="pink") color=Color.pink;
else if (temp=="lightGray") color=Color.lightGray;
//main program
public static void main(String [] args) {
Frame appl = new Frame();
appl.setVisible(true);
Thanks in advance
MarinaHi,
You are very lucky that I'm currently boored. You should never tag a question as urgent. It might be urgent to you, but not to us who answer. And you should also use code formatting when you post code (see the formatting tips, or use the code-button).
I made some changes to your Graph class. The most important thing is the abstract draw method that I added to the GeomFigur class.
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class Graph extends JPanel {
LinkedList figures;
public Graph() {
setBackground(Color.white);
figures = new LinkedList();
int z;
abstract class GeomFigur {
protected Color color;
public GeomFigur(Color color) {
this.color = color;
public abstract void move(Point p);
public abstract void draw(Graphics g);
abstract class Line extends GeomFigur {
Point p1, p2;
public Line(Color c, Point p1, Point p2) {
super(c);
this.p1 = new Point(p1);
this.p2 = new Point(p2);
public String toString() {
return "Line from " + p1 + " to " + p2;
public void move(Point dist) {
p1.move(dist.x, dist.y);
p2.move(dist.x, dist.y);
class Rectangle extends Line {
public Rectangle(Color c, Point p1, Point p2) {
super(c, p1, p2);
public String toString() {
return "Rectangle from " + p1 + " to " + p2;
public void draw(Graphics g) {
System.out.println("Draw rectangle at " + p1 + " with color " + color);
g.setColor(Color.black);
g.drawRect(p1.x, p1.y, 20, 20);
g.setColor(color);
g.fillRect(p1.x, p1.y, 20, 20);
class Circle extends GeomFigur {
Point centre;
int radius;
public Circle(Color c, Point centre, int radius) {
super(c);
this.centre = new Point(centre);
this.radius = radius;
public String toString() {
return "Circle, centre " + centre + ", radius " + radius;
public void move(Point dist) {
centre.move(dist.x, dist.y);
public void draw(Graphics g) {
System.out.println("Draw circle at " + centre + " with color " + color);
g.setColor(Color.black);
g.drawOval(centre.x, centre.y, 20, 20);
g.setColor(color);
g.fillOval(centre.x, centre.y, 20, 20);
public void addRectangle(int x, int y, Color col) {
System.out.println("x,y,col " + x + ":" + y + ":" + col);
Rectangle r = new Rectangle(col, new Point(x, y), new Point(x + 20, y + 20));
figures.addLast(r);
repaint();
public void addCircle(int x, int y, Color col) {
System.out.println("x,y,col" + x + ":" + y + ":" + col);
Circle c = new Circle(col, new Point(x, y), 1);
figures.addLast(c);
repaint();
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i = 0; i < figures.size(); i++) {
GeomFigur drawable = (GeomFigur)figures.get(i);
drawable.draw(g);
}/Kaj -
can someone pls help me with java on my macbook pro because after i download the mountain lion java has died and i need java to see streaming quotes from stock market
Java is no longer included in Mac OS X by default. If you want Java, you will have to install it.
However, note that you should think twice before installing Java for such a trivial need as looking at stock market quotes. There are other ways to get that information that don't involve Java, and using Java in your web browser is a HUGE security risk right now. Java has been vulnerable to attack almost constantly for the last year, and has become a very popular, frequently used method for getting malware installed via "drive-by downloads." You really, truly don't want to be using it. See:
Java is vulnerable… Again?!
http://java-0day.com -
HT5675 i need java 1.6 to get ,m,inecraft but it wont ever work please help?
i need java 1.6 to get minecraft but it wont ever work someone please help me!
Hello,
What version of Mac OS X are you running on your iBook?
Also check what version of java is currently installed by doing the following,
Open Terminal, type in java -version then press Enter. Then retrieve the current java version, in this example being 1.6.0_24 -
I'm lost when I try to figure out what exaclty is Java.... I need your help
Hi, I know that java is OOP, Multiplatform, etc, etc...
But when I try to look on google for jobs about java or "learn Java" what "Should I know in java"... I always found... whebshpere, oracle, linux, jboss, glassfish, opensolaris, struts, hibernate, spring, eclipse, netbeans, jidea, and so on!!!...
I'm lost... I will be sincere ...
I've started thank for a friend in a world of programming with .NET (ASP.NET SQL .NET Silverlight Windows Server) and was good BUT i feel inside that I prefer Java.
I don't know why but with java I feel free, i think will be a good technology for a long time.
But some things make my crazy.
I cant found a fast path or the right path without getting mess. Like I posted above.
So I need your help, if You are an advance programmer... tell what Should I learn ( essencially ) to get a good job. Oracle + Java ? linux + oracle + java? websphere + java? eclipse or netbeans?? all thouse things are awesome... but I am a HUMAN... I can't learn thouse all things and less in little time.... I just want to have a good preparation for to start to look a job in early time.
I look forward yours answers.
Thanks community.vidix wrote:
Hi, I know that java is OOP, Multiplatform, etc, etc...
So I need your help, if You are an advance programmer... tell what Should I learn ( essencially ) to get a good job. Oracle + Java ? linux + oracle + java? websphere + java? eclipse or netbeans?? all thouse things are awesome.The answer to that depends on what you want to do at work. I know great developers that never have written a single SQL statement, and I'm always trying to stay away from everything that has a web interface :)
Decide what you want to do at work, and then figure out what technologies you need to know. -
Complete Java n00b...need some help
I'm very new to Java and I need some help writing a basic program.
I need to write a program that lets the user add up an infinite amount of floating point numbers. The program should compute the sum of all the numbers entered thus far. So for example if the user enters 2 and 3, it should give a number of 5. If the user then enters 4, I should give me 9 etc.
I'm not really sure how to get started on writing that. I can add up two numbers but I don't know how to tell the program to keep adding additional numbers to that sum. Can someone please help me out? thanksIt's ok... it can be hard to understand even the simplest concepts with only text and no help.
There needs to be an int variable outside (before) the loop initialized to 0.
float num = 0;Next, you need to have an infinite loop that requests floats to add onto the number.
Scanner input = new Scanner(System.in);
while (true) {
float toAdd = input.nextFloat();
num += toAdd;
System.out.println("Current sum " + num);
}Putting all this together and putting it into a main method will work, but we have a bit of an issue. The program won't stop! For that reason, we need to specify a number which can exit the program. I like to use 0 for this purpose.
Scanner input = new Scanner(System.in);
while (true) {
float toAdd = input.nextFloat();
if (toAdd == 0) { //test if toAdd is 0 so the program can break;
break;
num += toAdd;
System.out.println("Current sum " + num);
}So, this code will work:
import java.util.Scanner;
class AddNumbers {
public static void main(String[] args) {
float num = 0;
Scanner input = new Scanner(System.in);
while (true) {
float toAdd = input.nextFloat();
if (toAdd == 0) { //test if toAdd is 0 so the program can break;
break;
num += toAdd;
System.out.println("Current sum: " + num);
}Edited by: Arricherekk on May 18, 2008 3:19 PM -
Beginner in java and need your help about DES
hello,
I m a new guy in java programming and learn from many books.I m making a website and portal right now and dying need your help about DES.my portal (using java) requires somebody to make a login name and a password.I m done with the server and client things and rite now stuck with this "DES" stuff.
so I make some conditions and algorithm below..
1. when a user login,the password is encrypted.at this point,cleartext(id) and encryption (M,N) are involve.
2. then the key is changed based on algorithm.
3.the key changed by key(id) is received and the original text should be encrypted.
the algorithm
1. the original text x1.x2.x3.x4.x5.x6.x7.x8 (64 bits)
2. encypt the password
a. Each character is changed into an int type by the ASCII code, and let the 1st bit be an odd number parity bit.
b.The 1st bit of the 1st character in (IP) is set to '1', and the 8th bit of the 8th character as '64'.
c.the rest (IP) is like this
1 2 3 4 5 6 7 8
0 # 58 50 42 34 26 18 10 2
8 # 60 52 44 36 28 20 12 4
16 # 62 54 46 38 30 22 14 6
24 # 64 46 48 40 32 24 16 8
32 # 57 49 41 33 25 17 9 1
40 # 59 51 43 35 27 19 11 3
48 # 61 53 45 37 29 21 13 5
56 # 63 55 47 39 31 23 15 7
d. and lastly,from above,,it should be done like this
1 2 3 4 5 6 7
0 # 40 8 48 16 56 24 64 32
8 # 39 7 27 15 55 23 53 31
16 # 38 6 26 14 54 22 52 30
24 # 37 5 25 13 53 21 51 29
32 # 36 4 24 12 52 20 50 28
40 # 35 3 23 11 51 19 49 27
48 # 34 2 21 10 50 18 48 26
56 # 33 1 20 9 49 17 47 25
e. key y1,y2,y3,y4,y5,y6,y7,y8 (64bit)
f. generate the key based on ID
a. Each character is changed into an int type by the ASCII code, and let the 1st bit be an even number parity bit.
b.the process is repeat again.
anybody has an idea to help me with the sample program?
thanks in advance...just ask about a simple program how to receive a
password from somebody and change it to a key..and
then confirm it with DES.Once again I have a problem understanding what you are asking.
Are you trying to use the password as a key to encrypt some 'standard thing' and place this encrypted value in a database? If so then look in the JCE for 'password based encryption' such as PBEWithMD5AndDes. This seems back to front to me but I can see nothing wrong with the approach since the 'standard thing' you would encrypt is in effect a key. If this is for a commercial application then I would find a security expert to evaluate your proposal!
In my experience it is more normal to encrypt the user's password with DES and store the result in the database. To do this just look in the JCE for DES encryption and consider using DES with CBC and PKCS5 padding. Also, consider encrypting the concatenation of the user's 'user name' with the password as this will (almost certainly) avoid having two encrypted values in the database that are the same even if two users have the same password.
For both of these you might consider using Base64 or Hex to turn you encrpted bytes into ASCII characters before trying to store them in your DB. -
Since installing Mac OS 10.10.1 photoshop will not run, it will not launch. A window indicates that it needs JAVA SE6 to run. JAVA SE6 is installed. I have re-installed and restarted but photoshop will not run and I get the same message window that I need to install JAVA SE6. How do I make this work?
Have you added any Photoshop Add-on that uses an external JavaScript. Photoshop itself has is own ScriptingSupport Plug-in and does not use an external java. Also Java SE6 is old and has security issues you should update to version SE8
Note the plug-in is system info
Adobe Photoshop Version: 2014.2.1 20141014.r.257 2014/10/14:23:59:59 CL 987299 x64
Required plug-ins:
3D Studio 15.2.1 (2014.2.1 x001 x003)
Accented Edges 15.2.1
Adaptive Wide Angle 15.2.1
Angled Strokes 15.2.1
Average 15.2.1 (2014.2.1 x001 x003)
Bas Relief 15.2.1
BMP 15.2.1
Camera Raw 8.7
Camera Raw Filter 8.7
Chalk & Charcoal 15.2.1
Charcoal 15.2.1
Chrome 15.2.1
Cineon 15.2.1 (2014.2.1 x001 x003)
Clouds 15.2.1 (2014.2.1 x001 x003)
Collada 15.2.1 (2014.2.1 x001 x003)
Color Halftone 15.2.1
Colored Pencil 15.2.1
CompuServe GIF 15.2.1
Conté Crayon 15.2.1
Craquelure 15.2.1
Crop and Straighten Photos 15.2.1 (2014.2.1 x001 x003)
Crop and Straighten Photos Filter 15.2.1
Crosshatch 15.2.1
Crystallize 15.2.1
Cutout 15.2.1
Dark Strokes 15.2.1
De-Interlace 15.2.1
Dicom 15.2.1
Difference Clouds 15.2.1 (2014.2.1 x001 x003)
Diffuse Glow 15.2.1
Displace 15.2.1
Dry Brush 15.2.1
Eazel Acquire 15.2.1 (2014.2.1 x001 x003)
Embed Watermark 4.0
Entropy 15.2.1 (2014.2.1 x001 x003)
Export Color Lookup Tables NO VERSION
Extrude 15.2.1
FastCore Routines 15.2.1 (2014.2.1 x001 x003)
Fibers 15.2.1
Film Grain 15.2.1
Filter Gallery 15.2.1
Flash 3D 15.2.1 (2014.2.1 x001 x003)
Fresco 15.2.1
Glass 15.2.1
Glowing Edges 15.2.1
Google Earth 4 15.2.1 (2014.2.1 x001 x003)
Grain 15.2.1
Graphic Pen 15.2.1
Halftone Pattern 15.2.1
HDRMergeUI 15.2.1
HSB/HSL 15.2.1
IFF Format 15.2.1
IGES 15.2.1 (2014.2.1 x001 x003)
Ink Outlines 15.2.1
JPEG 2000 15.2.1
Kurtosis 15.2.1 (2014.2.1 x001 x003)
Lens Blur 15.2.1
Lens Correction 15.2.1
Lens Flare 15.2.1
Liquify 15.2.1
Matlab Operation 15.2.1 (2014.2.1 x001 x003)
Maximum 15.2.1 (2014.2.1 x001 x003)
Mean 15.2.1 (2014.2.1 x001 x003)
Measurement Core 15.2.1 (2014.2.1 x001 x003)
Median 15.2.1 (2014.2.1 x001 x003)
Mezzotint 15.2.1
Minimum 15.2.1 (2014.2.1 x001 x003)
MMXCore Routines 15.2.1 (2014.2.1 x001 x003)
Mosaic Tiles 15.2.1
Multiprocessor Support 15.2.1 (2014.2.1 x001 x003)
Neon Glow 15.2.1
Note Paper 15.2.1
NTSC Colors 15.2.1 (2014.2.1 x001 x003)
Ocean Ripple 15.2.1
OpenEXR 15.2.1
Paint Daubs 15.2.1
Palette Knife 15.2.1
Patchwork 15.2.1
Paths to Illustrator 15.2.1
PCX 15.2.1 (2014.2.1 x001 x003)
Photocopy 15.2.1
Photoshop 3D Engine 15.2.1 (2014.2.1 x001 x003)
Photoshop Touch 14.0
Picture Package Filter 15.2.1 (2014.2.1 x001 x003)
Pinch 15.2.1
Pixar 15.2.1 (2014.2.1 x001 x003)
Plaster 15.2.1
Plastic Wrap 15.2.1
PLY 15.2.1 (2014.2.1 x001 x003)
PNG 15.2.1
Pointillize 15.2.1
Polar Coordinates 15.2.1
Portable Bit Map 15.2.1 (2014.2.1 x001 x003)
Poster Edges 15.2.1
PRC 15.2.1 (2014.2.1 x001 x003)
Radial Blur 15.2.1
Radiance 15.2.1 (2014.2.1 x001 x003)
Range 15.2.1 (2014.2.1 x001 x003)
Read Watermark 4.0
Render Color Lookup Grid NO VERSION
Reticulation 15.2.1
Ripple 15.2.1
Rough Pastels 15.2.1
Save for Web 15.2.1
ScriptingSupport 15.2.1 <------------------------------------------------------------------ Photoshop Scripting Support Plug-in
Shake Reduction 15.2.1
Shear 15.2.1
Skewness 15.2.1 (2014.2.1 x001 x003)
Smart Blur 15.2.1
Smudge Stick 15.2.1
Solarize 15.2.1 (2014.2.1 x001 x003)
Spatter 15.2.1
Spherize 15.2.1
Sponge 15.2.1
Sprayed Strokes 15.2.1
Stained Glass 15.2.1
Stamp 15.2.1
Standard Deviation 15.2.1 (2014.2.1 x001 x003)
STL 15.2.1 (2014.2.1 x001 x003)
Sumi-e 15.2.1
Summation 15.2.1 (2014.2.1 x001 x003)
Targa 15.2.1
Texturizer 15.2.1
Tiles 15.2.1
Torn Edges 15.2.1
Twirl 15.2.1
U3D 15.2.1 (2014.2.1 x001 x003)
Underpainting 15.2.1
Vanishing Point 15.2.1
Variance 15.2.1 (2014.2.1 x001 x003)
Virtual Reality Modeling Language | VRML 15.2.1 (2014.2.1 x001 x003)
Water Paper 15.2.1
Watercolor 15.2.1
Wave 15.2.1
Wavefront|OBJ 15.2.1 (2014.2.1 x001 x003)
WIA Support 15.2.1 (2014.2.1 x001 x003)
Wind 15.2.1
Wireless Bitmap 15.2.1 (2014.2.1 x001 x003)
ZigZag 15.2.1
Optional and third party plug-ins:
CUR (Windows Cursor) NO VERSION
Face Control II 2.00
Fine Touch 3.25
GREYCstoration NO VERSION
ICO (Windows Icon) NO VERSION
Reduce Noise 7.0.0.0
ScriptListener 13.0
StarFilter Pro 3 3.0.5.1
SuperPNG 2.0
Variations 14.2.1 (14.2.1 x001)
Plug-ins that failed to load: NONE
Flash:
Libraries
Adobe Color Themes
Installed TWAIN devices: NONE -
Basic Output program need some help...Please
import java.io.*;
class FileOutputDemo
public static void main(String args[])
int one=1, two=2, three=3;
FileOutputStream out; // declare a file output object
PrintStream p; // declare a print stream object
try
// Create a new file output stream
// connected to "myfile.html"
out = new FileOutputStream("myfile.html");
// Connect print stream to the output stream
p = new PrintStream( out );
p.printf ("This is written to a file %d", one);
p.close();
catch (Exception e)
System.err.println ("Error writing to file");
}Hello I am new to java, and I hope someone help me to modify the above code in order to make it work as the following:
I have a list of integer values like 1, 2, 3, 4? 10
And I want the program to substitute the integer values (the integer declared list) subsequently one by one to output a new html file as the following output:
This is written to a file 1
This is written to a file 2
This is written to a file3 ?etc
Also this substitution has to be outputted to a new file every time.
Thank you very much in advance for your kind help
if i have to post this anywhere else please advise me..
Adamimport java.io.*;
public class FileOutputDemo
public static void main(String[] args) {
FileOutputStream out; // declare a file output object
PrintStream p; // declare a print stream object
try
// Create a new file output stream
// connected to "myfile.html"
out = new FileOutputStream("myfile.html");
p = new PrintStream( out );
int[] arrayOfInts = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
for (int element : arrayOfInts)
p.printf (element + " ");
p.close();
// Connect print stream to the output stream
catch (Exception e)
System.err.println ("Error writing to file");
}ok .... guys i really understand what do you mean,
i only need your help to make the program print one integer at a time from the array to a seprate file ....what do you suggest ... any hints
Thanks -
Need your help on performance issue please
Hello everyone!
I need your help to understand an effect I notice with a Thread class I built. I currently work on enhancement of my application Playlist Editor (see http://www.lightdev.com/page74.htm) and a new release will be available soon.
Among other extensions the new release will have a title filter function which is based on audio data that is recursively read from ID3 tags of files found in a given root directory. The data collection is done by a CollectionThread class which reads into a data model class AudioDataModel and the entire process works fine, no problem with that.
However, when my application is started for the first time the CollectionThread runs approximately 3 minutes to collect data from approximately 4300 audio files on an Intel Pentium M 1,4 GHz, 512 MB RAM, Windows XP SP2. When the application is shut down and started again, it takes only a few seconds to do the same task for all subsequent launches.
I already tried to start the application with java option -Xms40m to increase initial heap size. This increases performance in general but the effect is still the same, i.e. first run lasts significantly longer than subsequent runs.
I also tried to build a pool mechanism which creates many empty objects in the data model and then releases them to contain the actual data at is being read in but this did not lead to better performance.
It must have to do with how Java (or Windows?) allocates and caches memory. I wonder whether there is a way to pre-allocate memory or if there are any other ideas to improve performance so that the process always only takes seconds instead of minutes?
I attach the key classes to this message. Any help or ideas is much appreciated!
Thanks a lot a best regards
Ulrich
PS: You can use the news subscription service at
http://www.lightdev.com/dynTemplate.php4?id=80&dynPage=subscribe.php4 to be informed when the new release of Playlist Editor is available.
All classes posted here do not need debugging, they already have proven to run error free. The classes are only posted for information for the interested reader - no need to go through all the stuff in detail - only if it interests you.
My application calls class CollectionThread wich is a subclass of InfoThread. CollectionThread recursively goes through a directory and file structure and stores found ID3 tag information in instances of class ID3v11Tag which in turn gets stored in one instance of class AudioDataModel. All classes are shown below.
This is the mentioned CollectionThread
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import com.lightdev.lib.util.InfoThread;
import java.io.File;
* A class to collect audio data from a given storage location.
* <p>
* <code>CollectionThread</code> uses ID3 tag information to gain data.
* </p>
* <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.</p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 13, 2004
public class CollectionThread extends InfoThread {
* constructor
* @param model AudioDataModel the data model to collect data to
public CollectionThread(AudioDataModel model) {
this.model = model;
* constructor, creates a new empty AudioDataModel
public CollectionThread() {
this(new AudioDataModel());
* set the data model to collect data to
* @param model AudioDataModel the model to collect data to
public void setModel(AudioDataModel model) {
this.model = model;
* get the data model associated to this thread
* @return AudioDataModel the data model
public AudioDataModel getModel() {
return model;
* set the directory to collect data from
* @param rootDir File the directory to collect data from
public void setRootDirectory(File rootDir) {
this.rootDir = rootDir;
* do te actual work of this thread, i.e. iterate through a given directory
* structure and collect audio data
* @return boolean true, if work is left
protected boolean work() {
boolean workIsLeft = true;
maxValue = -1;
filesProcessed = 0;
if(getStatus() < STATUS_HALT_PENDING) {
countElements(rootDir.listFiles());
if(getStatus() < STATUS_HALT_PENDING) {
workIsLeft = collect(rootDir.listFiles());
return workIsLeft;
* count the elements in a given file array including its subdirectories
* @param files File[]
private void countElements(File[] files) {
int i = 0;
while (i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files;
if (file.isDirectory()) {
countElements(file.listFiles());
i++;
maxValue++;
* recursively read data into model
* @param files File[] the file array representing the content of a given directory
private boolean collect(File[] files) {
int i = 0;
while(i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files[i];
if(file.isDirectory()) {
collect(file.listFiles());
else if(file.getName().toLowerCase().endsWith("mp3")) {
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
i++;
filesProcessed++;
fireThreadProgress(filesProcessed);
return (i<files.length);
/** the directory to collect data from */
private File rootDir;
/** the data model to collect data to */
private AudioDataModel model;
/** the number of files this thread processed so far while it is running */
private long filesProcessed = 0;
This is class InfoThread
* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.util;
import java.util.Vector;
import java.util.Enumeration;
* Abstract class <code>InfoThread</class> implements a status and listener concept.
* An <code>InfoThread</code> object actively informs all objects registered as listeners about
* status changes, progress and possible exceptions. This way the status of a running
* thread does not require a polling mechanism to be monitored.
* <p>
* <code>InfoThread</code> implements the following working scheme
* </p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public abstract class InfoThread extends Thread {
* construct an <code>InfoThread</code> object
* <p>This class is meant to be used when a <code>Thread</code> object is needed that actively
* informs other objects about its status</code>. It is a good idea therefore to register
* one or more listeners with instances of this class before doing anything
* else.</p>
* @see addInfoThreadListener
public InfoThread() {
* set the amount of time this thread shall idle after it is through with one
* work cycle and before a next work cycle is started. This influences the time
* other threads have for their work.
* @param millis long the number of milliseconds to idle after one work cycle
public void setIdleMillis(long millis) {
idleMillis = millis;
* Causes this thread to begin execution; the Java Virtual Machine calls the <code>run</code>
* method of this thread. Calls method <code>prepareThread</code> before calling
* <code>run</code>.
* @see run
* @see prepareThread
public synchronized void start() {
setStatus(STATUS_INITIALIZING);
prepareThread();
setStatus(STATUS_READY);
super.start();
* call method <code>start</code> instead of this method.
* calling this method directly will lead to an exception
* @see start
public void run() {
//System.out.println("InfoThread.run");
if (status == STATUS_READY) {
boolean workIsLeft = true;
setStatus(STATUS_RUNNING);
while (status < STATUS_STOP_PENDING && workIsLeft) {
if (status < STATUS_HALT_PENDING) {
workIsLeft = work();
if(!workIsLeft) {
setStatus(STATUS_WORK_COMPLETE);
if (status == STATUS_HALT_PENDING) {
setStatus(STATUS_HALTED);
else if (status == STATUS_STOP_PENDING) {
setStatus(STATUS_STOPPED);
else {
try {
sleep(idleMillis);
catch (InterruptedException e) {
fireThreadException(e);
else {
// error: Thread is not ready to run
setStatus(STATUS_THREAD_FINISHED);
* stop this thread. This will terminate the thread irrevokably. Use method
* <code>haltThread</code> to pause a thread with the possiblity to resume work later.
* @see haltThread
public void stopThread() {
switch (status) {
case STATUS_RUNNING:
setStatus(STATUS_STOP_PENDING);
break;
case STATUS_HALT_PENDING:
// exception: the thread already is about to halt
break;
case STATUS_STOP_PENDING:
// exception: the thread already is about to stop
break;
default:
// exception: a thread can not be stopped, when it is not running
break;
* halt this thread, i.e. pause working allowing to resume later
* @see resumeThread
public void haltThread() {
switch (status) {
case STATUS_RUNNING:
setStatus(STATUS_STOP_PENDING);
break;
case STATUS_HALT_PENDING:
// exception: the thread already is about to halt
break;
case STATUS_STOP_PENDING:
// exception: the thread already is about to stop
break;
default:
// exception: a thread can not be halted, when it is not running
break;
* resume this thread, i.e. resume previously halted work
* @see haltThread
public void resumeThread() {
if(status == STATUS_HALTED || status == STATUS_HALT_PENDING) {
setStatus(STATUS_RUNNING);
else {
// exception: only halted threads or threads that are about to halt can be resumed
* this is the method to prepare a thread to run. It is not implemented in this abstract
* class. Subclasses of <code>InfoThread</code> can implement this method to do anything
* that might be required to put their thread into STATUS_READY. This method is called
* automatically by method <code>start</code>. When implementing this method, it should
* call method <code>fireThreadException</code> accordingly.
* @see start
* @see fireThreadException
protected void prepareThread() {
// does nothing in this abstract class but might be needed in subclasses
* this is the main activity method of this object. It is not implemented in this abstract
* class. Subclasses of <code>InfoThread</code> must implement this method to do something
* meaningful. When implementing this method, it should call methods
* <code>fireThreadProgress</code> and <code>fireThreadException</code> accordingly.
* @return boolean true, if work is left, false if not
* @see fireThreadProgress
* @see fireTreadException
protected abstract boolean work();
* add an <code>InfoTreadListener</code> to this instance of <code>InfoThread</code>
* @param l InfoThreadListener the listener to add
* @see removeInfoThreadListener
public void addInfoThreadListener(InfoThreadListener l) {
listeners.add(l);
* remove an <code>InfoTreadListener</code> from this instance of <code>InfoThread</code>
* @param l InfoThreadListener the listener to remove
public void removeInfoThreadListener(InfoThreadListener l) {
listeners.remove(l);
* notify all <code>InfoThreadListener</code>s of a status change
* @param fromStatus int the status tis thread had before the change
* @param toStatus int the status this thread has now
protected void fireThreadStatusChanged(int fromStatus, int toStatus) {
Enumeration e = listeners.elements();
while(e.hasMoreElements()) {
Object l = e.nextElement();
if(l instanceof InfoThreadListener) {
((InfoThreadListener) l).threadStatusChanged(this, fromStatus, toStatus);
* notify all <code>InfoThreadListener</code>s of an exception in this thread
* @param ex Exception the exception that occurred
protected void fireThreadException(Exception ex) {
Enumeration e = listeners.elements();
while(e.hasMoreElements()) {
Object l = e.nextElement();
if(l instanceof InfoThreadListener) {
((InfoThreadListener) l).threadException(this, ex);
* notify all <code>InfoThreadListener</code>s of the progress of this thread
* @param progressValue long a value indicating the current thread progress
protected void fireThreadProgress(long progressValue) {
Enumeration e = listeners.elements();
while(e.hasMoreElements()) {
Object l = e.nextElement();
if(l instanceof InfoThreadListener) {
((InfoThreadListener) l).threadProgress(this, progressValue, maxValue);
* set the status of this thread and notify all listeners
* @param newStatus int the status this thread is to be changed to
private void setStatus(int newStatus) {
//System.out.println("InfoThread.setStatus oldStatus=" + status + ", newStatus=" + newStatus);
int fromStatus = status;
status = newStatus;
fireThreadStatusChanged(fromStatus, newStatus);
* get the current status of this thread
* @return int the status
public int getStatus() {
return status;
* cleanup before actual destruction.
public void destroy() {
//System.out.println("InfoThread.destroy");
cleanup();
super.destroy();
* cleanup all references this thread maintains
private void cleanup() {
//System.out.println("InfoThread.cleanup");
listeners.removeAllElements();
listeners = null;
/* ----------------------- class fields start ------------------------ */
/** storage for the objects this thread notifies about status changes and progress */
private Vector listeners = new Vector();
/** indicator for the status of this thread */
private int status = STATUS_NONE;
/** maximum value for threadProgress */
protected long maxValue = -1;
/** the idle time inside one work cycle in milliseconds */
protected long idleMillis = 1;
/* ----------------------- class fields end -------------------------- */
/* ----------------------- constants start --------------------------- */
/** constant value indicating that no status has been set so far */
public static final int STATUS_NONE = 0;
/** constant value indicating that the thread is currently initializing */
public static final int STATUS_INITIALIZING = 1;
/** constant value indicating that the thread is ready to run */
public static final int STATUS_READY = 2;
/** constant value indicating that the thread is running */
public static final int STATUS_RUNNING = 3;
/** constant value indicating that the thread is about to halt */
public static final int STATUS_HALT_PENDING = 4;
/** constant value indicating that the thread is halted */
public static final int STATUS_HALTED = 5;
/** constant value indicating that the work of this thread is complete */
public static final int STATUS_WORK_COMPLETE = 6;
/** constant value indicating that the thread is about to stop */
public static final int STATUS_STOP_PENDING = 7;
/** constant value indicating that the thread is stopped */
public static final int STATUS_STOPPED = 8;
/** constant value indicating that the thread is finished */
public static final int STATUS_THREAD_FINISHED = 9;
/* ----------------------- constants end --------------------------- */
}this is the InfoThreadListener interface
* Light Development Java Library
* Copyright (C) 2003, 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.util;
* An interface classes interested to receive events from objects
* of class <code>InfoThread</code> need to implement.
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public interface InfoThreadListener {
* method to receive a status change notification from a thread
* @param thread InfoThread the thread which status changed
* @param fromStatus int the status which the thread had before the change
* @param toStatus int the status which the thread has now
public void threadStatusChanged(InfoThread thread, int fromStatus, int toStatus);
* method to receive a notification about the progress of a thread
* @param thread InfoThread the thread which notified about its progress
* @param progressValue long the value (e.g. 10 if 100 percent completed, 20 of 1 million files processed, etc.)
public void threadProgress(InfoThread thread, long progressValue, long maxValue);
* method to receive a notifiaction about the fact that an exception occurred in a thread
* @param thread InfoThread the thread for which an exception occurred
* @param e Exception the exception that occurred
public void threadException(InfoThread thread, Exception e);
}This is class AudioFileDescriptor
* Light Development Java Library
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.audio;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.Serializable;
import java.text.DecimalFormat;
* This class models characteristics of an audio file such as the absolute path
* of the file, its tag contents (if any) and the play duration, etc.
* <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.</p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public class AudioFileDescriptor implements Serializable, Comparable {
public AudioFileDescriptor(String absolutePath) throws FileNotFoundException, IOException {
load(absolutePath);
public boolean equals(Object o) {
if(o != null && o instanceof AudioFileDescriptor) {
return ((AudioFileDescriptor) o).getAbsolutePath().equalsIgnoreCase(this.getAbsolutePath());
else {
return false;
public void load(String absolutePath) throws FileNotFoundException, IOException {
this.absolutePath = absolutePath;
RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
if(id3v11Tag == null) {
id3v11Tag = new ID3v11Tag(rf, false);
else {
id3v11Tag.readTag(rf, rf.length() - 128);
rf.close();
public String getAbsolutePath() {
return absolutePath;
public ID3v11Tag getID3v11Tag() {
return id3v11Tag;
public void setID3v11Tag(ID3v11Tag tag) {
this.id3v11Tag = tag;
public String toString() {
DecimalFormat df = new DecimalFormat("00");
return id3v11Tag.getArtist() + ", " + id3v11Tag.getAlbum() + " - " +
df.format(id3v11Tag.getTrackNumber()) + " " + id3v11Tag.getTitle();
* Compares this object with the specified object for order.
* @param o the Object to be compared.
* @return a negative integer, zero, or a positive integer as this object is less than, equal to,
* or greater than the specified object.
* @todo Implement this java.lang.Comparable method
public int compareTo(Object o) {
return toString().compareTo(o.toString());
private String absolutePath;
private ID3v11Tag id3v11Tag;
private transient long duration = -1;
private transient int type = TYPE_UNKNOWN;
public static final transient int TYPE_UNKNOWN = 0;
public static final transient int TYPE_MP3 = 1;
}This is class ID3V11Tag into which the data is actually stored
* Light Development Java Library
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.lib.audio;
import java.io.File;
import java.io.RandomAccessFile;
import java.io.IOException;
import java.io.Serializable;
import java.text.DecimalFormat;
* This class is a very simple implementation of an ID3v11Tag. It models an ID3 tag
* pretty much the same way as it is physically stored inside an audio file.
* <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.</p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software
* @version Version 1, October 13, 2004
public class ID3v11Tag implements Serializable, Comparable {
* construct an ID3v11Tag and read tag content from a given file
* <p>This constructor can be used for cases where a RandomAccessFile has already
* been opened and will be closed elsewhere</p>
* @param rf RandomAccessFile the open file to read from
* @param isAtTagStartPos boolean true, if the file pointer is at the
* position where the ID3 tag starts; when false, the pointer is positioned accordingly here
* @throws IOException
public ID3v11Tag(RandomAccessFile rf, boolean isAtTagStartPos) throws IOException {
if(isAtTagStartPos) {
readTag(rf);
else {
readTag(rf, rf.length() - 128);
* construct an ID3v11Tag and read tag content from a file at a given location
* <p>This constructor opens and closes the audio file for reading</p>
* @param absolutePath String the absolute path to the audio file to open
* @throws IOException
public ID3v11Tag(String absolutePath) throws IOException {
RandomAccessFile rf = new RandomAccessFile(absolutePath, "r");
readTag(rf, rf.length() - 128);
rf.close();
* construct an ID3v11Tag and read tag content from a given file
* <p>This constructor opens and closes the audio file for reading</p>
* @param audioFile File the audio file to read from
* @throws IOException
public ID3v11Tag(File audioFile) throws IOException {
this(audioFile.getAbsolutePath());
* get a string representation of this object
* @return String
public String toString() {
DecimalFormat df = new DecimalFormat("00");
return getArtist() + ", " + getAlbum() + " - " + df.format(getTrackNumber()) + " " + getTitle();
* position to file pointer and read the tag
* @param rf RandomAccessFile the file to read from
* @param jumpPos long the position to jump to (the tag start position)
* @throws IOException
public void readTag(RandomAccessFile rf, long jumpPos) throws IOException {
rf.seek(jumpPos);
readTag(rf);
* read the tag from a given file, assuming the file pointer to be at the tag start position
* @param rf RandomAccessFile the file to read from
* @throws IOException
public void readTag(RandomAccessFile rf) throws IOException {
rf.read(tagBuf);
if(tag.equalsIgnoreCase(new String(tagBuf))) {
rf.read(title);
rf.read(artist);
rf.read(album);
rf.read(year);
rf.read(comment);
rf.read(trackNo);
rf.read(genre);
public String getTitle() {
return new String(title).trim();
public String getArtist() {
return new String(artist).trim();
public String getAlbum() {
return new String(album).trim();
public String getYear() {
return new String(year).trim();
public String getComment() {
return new String(comment).trim();
public int getGenreId() {
try {
int id = new Byte(genre[0]).intValue();
if(id < GENRE_ID_MIN || id > GENRE_ID_MAX) {
return GENRE_ID_OTHER;
else {
return id;
catch(Exception ex) {
return GENRE_ID_OTHER;
public String getGenreName() {
return genreNames[getGenreId()];
public int getTrackNumber() {
try {
return (int) trackNo[0];
catch(Exception e) {
return 0;
* Compares this object with the specified object for order.
* @param o the Object to be compared.
* @return a negative integer, zero, or a positive integer as this object is less than, equal to,
*Hi Franck,
thank you, mate. I did what you suggested (changed class attached) but that did not change the mentioned behaviour.
The first run is approximately 75 seconds with Java option -Xms40m and approx. double without, the second run and all subsequent runs are only 2-3 seconds each (!!!) even when terminating and re-starting the application between thread runs.
I'm pretty clueless about that, any more help on this anyone?
Thanks a lot and best regards
Ulrich
PS: BTW, I forgot to post the class that is filled with data by class CollectionThread, so here it is
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import java.io.File;
import com.lightdev.lib.audio.ID3v11Tag;
import javax.sound.sampled.UnsupportedAudioFileException;
import java.io.IOException;
import java.io.Serializable;
import com.lightdev.lib.audio.AudioFileDescriptor;
import com.lightdev.lib.ui.SortListModel;
import java.util.Iterator;
* Storage model for audio data.
* <p>
* <code>AudioDataModel</code> can be used to store ID3 tag data collected from
* a directory with audio files to perform queries and reports on the found data.
* </p>
* <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.</p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 15, 2004
public class AudioDataModel extends SortListModel implements Serializable {
* constructor
public AudioDataModel() {
* add an audio track from a given audio file
* <p>This will attempt to read ID3 tag data from the file.</p>
* @param audioFile File the file to add audio data for
* @throws IOException
public void addTrack(File audioFile) throws IOException {
AudioFileDescriptor afd = new AudioFileDescriptor(audioFile.getAbsolutePath());
if (!data.contains(afd)) {
data.add(afd);
* get all tracks for agiven combination of genre name, artist name and album name. Any of
* the parameters may be null or AudioDataModel.FILTER_ALL
* <p>Ugly code, I know, but it simply hard codes all combinations of the the mentioned
* parameters. Any more elegant implementations welcome.</p>
* @param genreName String a genre name to get tracks for
* @param artistName String an artist name to get tracks for
* @param albumName String an album name to get tracks for
* @return SortListModel the found tracks in a list model
public SortListModel getTracks(String genreName, String artistName, String albumName) {
SortListModel foundTracks = new SortListModel();
Iterator e = data.iterator();
while(e.hasNext()) {
AudioFileDescriptor afd = (AudioFileDescriptor) e.next();
ID3v11Tag tag = afd.getID3v11Tag();
if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
if (tag.getAlbum().equalsIgnoreCase(albumName))
foundTracks.add(afd);
else {
if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
if (tag.getArtist().equalsIgnoreCase(artistName))
foundTracks.add(afd);
else {
if (tag.getArtist().equalsIgnoreCase(artistName) &&
tag.getAlbum().equalsIgnoreCase(albumName))
foundTracks.add(afd);
else {
if(artistName == null || artistName.equalsIgnoreCase(FILTER_ALL)) {
if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
if (tag.getGenreName().equalsIgnoreCase(genreName))
foundTracks.add(afd);
else {
if (tag.getGenreName().equalsIgnoreCase(genreName) &&
tag.getAlbum().equalsIgnoreCase(albumName))
foundTracks.add(afd);
else {
if(albumName == null || albumName.equalsIgnoreCase(FILTER_ALL)) {
if (tag.getGenreName().equalsIgnoreCase(genreName) &&
tag.getArtist().equalsIgnoreCase(artistName))
foundTracks.add(afd);
else {
if (tag.getGenreName().equalsIgnoreCase(genreName) &&
tag.getArtist().equalsIgnoreCase(artistName) &&
tag.getAlbum().equalsIgnoreCase(albumName))
foundTracks.add(afd);
foundTracks.sort();
return foundTracks;
* list all artists in this model
* @return SortListModel
public SortListModel listArtists() {
SortListModel artists = new SortListModel();
artists.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String artistName = tag.getArtist();
if (artists.indexOf(artistName) < 0) {
artists.add(artistName);
artists.sort();
return artists;
* list all artists in this model having titles belonging to a given genre
* @param genreName String name of the genre artists are searched for
* @return SortListModel
public SortListModel listArtists(String genreName) {
SortListModel artists = new SortListModel();
artists.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String artistName = tag.getArtist();
String genre = tag.getGenreName();
if (artists.indexOf(artistName) < 0 && genre.equalsIgnoreCase(genreName)) {
artists.add(artistName);
artists.sort();
return artists;
* list all genres in this model
* @return SortListModel
public SortListModel listGenres() {
SortListModel genres = new SortListModel();
genres.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String genreName = tag.getGenreName();
if (genres.indexOf(genreName) < 0) {
genres.add(genreName);
genres.sort();
return genres;
* list all albums in this model
* @return SortListModel
public SortListModel listAlbums() {
SortListModel albums = new SortListModel();
albums.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String albumName = tag.getAlbum();
if (albums.indexOf(albumName) < 0) {
albums.add(albumName);
albums.sort();
return albums;
* list all albums in this model having titles belonging to a given genre
* @param genreName String name of the genre albums are searched for
* @return SortListModel
public SortListModel listAlbums(String genreName) {
SortListModel albums = new SortListModel();
albums.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String albumName = tag.getAlbum();
String genre = tag.getGenreName();
if (albums.indexOf(albumName) < 0 && genre.equalsIgnoreCase(genreName)) {
albums.add(albumName);
albums.sort();
return albums;
* list all albums in this model having titles belonging to a given genre and artist
* @param genreName String name of the genre albums are searched for
* @param artistName String name of the artist albums are searched for
* @return SortListModel
public SortListModel listAlbums(String genreName, String artistName) {
SortListModel albums = new SortListModel();
albums.add(FILTER_ALL);
Iterator e = data.iterator();
while (e.hasNext()) {
ID3v11Tag tag = ((AudioFileDescriptor) e.next()).getID3v11Tag();
String albumName = tag.getAlbum();
String genre = tag.getGenreName();
String artist = tag.getArtist();
if(genreName == null || genreName.equalsIgnoreCase(FILTER_ALL)) {
if (albums.indexOf(albumName) < 0 &&
artist.equalsIgnoreCase(artistName))
albums.add(albumName);
else {
if (albums.indexOf(albumName) < 0 &&
genre.equalsIgnoreCase(genreName) &&
artist.equalsIgnoreCase(artistName))
albums.add(albumName);
albums.sort();
return albums;
* get the number of audio tracks stored in this data model
* @return int the number of tracks
public int getTrackCount() {
return data.size();
/** constant to select all items of a given part */
public static final String FILTER_ALL = " all";
}...and here the changed CollectionThread now caching found File objects in a vector
* Light Development Playlist Editor
* Copyright (C) 2004 Ulrich Hilger
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package com.lightdev.app.playlisteditor.data;
import com.lightdev.lib.util.InfoThread;
import java.io.File;
import java.util.Vector;
import java.util.Enumeration;
* A class to collect audio data from a given storage location.
* <p>
* <code>CollectionThread</code> uses ID3 tag information to gain data.
* </p>
* <p>See <a href="http://www.id3.org">http://www.id3.org</a> for details about
* ID3 tags.</p>
* @author Ulrich Hilger
* @author Light Development
* @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
* @author <a href="mailto:[email protected]">[email protected]</a>
* @author published under the terms and conditions of the
* GNU General Public License,
* for details see file gpl.txt in the distribution
* package of this software as well as any licensing notes
* inside this documentation
* @version 1, October 13, 2004
public class CollectionThread extends InfoThread {
* constructor
* @param model AudioDataModel the data model to collect data to
public CollectionThread(AudioDataModel model) {
this.model = model;
* constructor, creates a new empty AudioDataModel
public CollectionThread() {
this(new AudioDataModel());
* set the data model to collect data to
* @param model AudioDataModel the model to collect data to
public void setModel(AudioDataModel model) {
this.model = model;
* get the data model associated to this thread
* @return AudioDataModel the data model
public AudioDataModel getModel() {
return model;
* set the directory to collect data from
* @param rootDir File the directory to collect data from
public void setRootDirectory(File rootDir) {
this.rootDir = rootDir;
* this is the method to prepare a thread to run.
protected void prepareThread() {
maxValue = -1;
filesProcessed = 0;
innerCount = 0;
fileList = new Vector();
* do the actual work of this thread, i.e. iterate through a given directory
* structure and collect audio data
* @return boolean true, if work is left
protected boolean work() {
boolean workIsLeft = true;
if(getStatus() < STATUS_HALT_PENDING) {
countElements(rootDir.listFiles());
if(getStatus() < STATUS_HALT_PENDING) {
workIsLeft = collect(); //collect(rootDir.listFiles());
fileList.clear();
fileList = null;
return workIsLeft;
* count the elements in a given file array including its subdirectories
* @param files File[]
private void countElements(File[] files) {
int i = 0;
while (i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files;
if (file.isDirectory()) {
countElements(file.listFiles());
else {
fileList.add(file);
i++;
maxValue++;
* read data into model
* @param files File[] the file array representing the content of a given directory
* @return boolean true, if work is left
private boolean collect(/*File[] files*/) {
Enumeration files = fileList.elements();
while(files.hasMoreElements() && getStatus() < STATUS_HALT_PENDING) {
File file = (File) files.nextElement();
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
filesProcessed++;
if(++innerCount > 99) {
innerCount = 0;
fireThreadProgress(filesProcessed);
return false;
int i = 0;
while(i < files.length && getStatus() < STATUS_HALT_PENDING) {
File file = files[i];
if(file.isDirectory()) {
collect(file.listFiles());
else if(file.getName().toLowerCase().endsWith("mp3")) {
try {
model.addTrack(file);
catch(Exception e) {
fireThreadException(e);
i++;
filesProcessed++;
fireThreadProgress(filesProcessed);
return (i<files.length);
/** the directory to collect data from */
private File rootDir;
/** the data model to collect data to */
private AudioDataModel model;
/** the number of files this thread processed so far while it is running */
private long filesProcessed = 0;
/** a list to temporary store found files */
private Vector fileList;
/** counter to determine when to fire progress messages */
private int innerCount = 0;
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