Input / Output Object Stream
Hello
I'm using Input / Output Object Stream to transfer an object between a client / server utilities.
I create an object and give it a state, then used the OutputObjectStream.
After sending the object for the first time (and recieving it in the InputObjectStream), I change the state of the object and send it again using the same output stream.
On the recieving side I got the "Old" object, i.e. an object with the Old State.
any idea ???
Oded
The Object Stream keeps track of references to objects and only sends an object once.
This is to allow you to send objects which contain circular references.
The may around this is to call reset() on the ObjectOutputStream. This causes it to forget all refrences (And the ObjectInputStream)
You have to do this anyway otherwise the ObejctOutputStream will remember more and more objects until you run out of memory!
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Get multiple Input/Output Stream from same socket ?
For a better express of my problem i will put my test example
I have those 4 classes
package test;
import...
public class ReaderExecutor extends Thread{
private InputStream in = null;
private static int defaultID = 0;
private int ID = getID();
public ReaderExecutor(InputStream in){
this.in = in;
public void run(){
try {
int c ;
while ((c=in.read())!=-1)
System.out.println("ReaderThread " + this.ID + ":" + c);
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import...
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OutputStream out = null;
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private boolean isOdd ;
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this.out = out;
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package test;
import...
public class Main {
public Main() {
public static void main(String[] args) throws Exception {
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ServerSocket ss = new ServerSocket(9090);
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Socket client = ss.accept();
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new ReaderExecutor(client.getInputStream()).start();
}catch (Exception e){
e.printStackTrace();
package test;
import...
public class Main1 {
public Main1() {
public static void main(String[] args) {
try{
Socket s = new Socket("localhost",9090);
WriterExecuter t= null ;
t = new WriterExecuter(s.getOutputStream());
t.start();
t = new WriterExecuter(s.getOutputStream());
t.start();
}catch(Exception e){
e.printStackTrace();
}Now if i run successive Main , Main1 i get this output
Ascult ...
ReaderThread 0:0
ReaderThread 1:0
ReaderThread 0:0
ReaderThread 1:0
ReaderThread 0:0
ReaderThread 1:0
ReaderThread 0:0
ReaderThread 1:0
ReaderThread 0:0
ReaderThread 0 stopped !
ReaderThread 1 stopped !The question is can i get other Input/Output individual streams with a separate logic functionality from the same socket?
From this example it seems i can't :(
Thx
AlexFor what you are trying to do the simplest solution is to have one socket per "stream" that is the way they are designed to be used.
However, you can multiplex multiple stream over a single socket, but you have do the coding yourself or use a solution which does this for you e.g. JMS. (There is no support at the socket level for this) -
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I've been told to look at object input/output stream, which I have, but I can't get my head around what's written in the books. Does anyone know where i can find a good tutorial on this subject?
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Hi,
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RgdsThe Object Stream keeps track of references to objects and only sends an object once.
This is to allow you to send objects which contain circular references.
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Need a hand to configure FMS 4.5 to output HTTP stream...
Hi folks!
I'm trying to setup Flash Media Server (Streaming server) and I'm having issues with outputting HTTP stream.
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(Don't forget to select the radio button for HTTP streaming)
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Now, I don't have an iDevice on me to check out HLS playback.
You are using an older version of QuickTime, which could be an issue. Please let me know what publish settings you are using (as in the codecs).
Also can you try playing it back through HTML5. To do that, just create an HTML page with the below content.
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<video width="320" height="240" controls="controls" src="http://184.107.48.113:8134/hls-live/livepkgr/_definst_/livebroadcast/livestream.m3u8" />
</body>
</html> -
My program is supposed to be a Driving instructor program that allows someone to enter a Name and Lesson Number, and it will pull up the Date, and Comments that the lesson took place. The information is saved in a file with the person's name, and saved as an array. We are required to use Object Streams for the file i/o. The only part of the program that I don't have working is the actual file i/o. The large commented section that I have in the datamanager class is the notes from the professor on the board and I haven't removed them yet. There are 4 classes for this file.
The main class that creates the program and calls the other classes.
import java.awt.*;
import javax.swing.*;
public class main {
/** Creates a new instance of main */
public main() {
* @param args the command line arguments
public static void main(String[] args)
guiLayout labelFrame = new guiLayout(); // creates LabelFrame
labelFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
labelFrame.setSize(600, 200);
labelFrame.setVisible(true);
} The second class is the GUI class and event handler class.
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class guiLayout extends JFrame{
private JPanel centertop;
private JPanel centermiddle;
private JPanel centerbottom;
private JLabel dateLabel;
private JLabel nameLabel;
private JLabel lessonLabel;
private JLabel commentsLabel;
private JTextArea DateTextArea;
private JTextArea NameTextArea;
private JTextArea LessonTextArea;
private JTextArea CommentsTextArea;
private JButton Save;
private JButton Retrieve;
private String tempDay[];
private DataManager DMO;
/** Creates a new instance of guiLayout */
public guiLayout()
super("Drive Application");
setLayout(new FlowLayout());
dateLabel = new JLabel("Date (mm/dd/yy)");
nameLabel = new JLabel("Name");
lessonLabel = new JLabel("Lesson (1-10)");
commentsLabel = new JLabel("Comments");
DateTextArea = new JTextArea(1, 7);
NameTextArea = new JTextArea(1, 15);
LessonTextArea = new JTextArea(1, 2);
CommentsTextArea = new JTextArea(6, 30);
Save = new JButton( "Save");
Retrieve = new JButton( "Retrieve");
//insert into GUI
//TOP
centertop = new JPanel();
centertop.add(nameLabel);
centertop.add(NameTextArea);
centertop.add(lessonLabel);
centertop.add(LessonTextArea);
centertop.add(dateLabel);
centertop.add(DateTextArea);
centertop.setLayout(new GridLayout(6,1));
add(centertop, BorderLayout.NORTH);
centermiddle = new JPanel();
centermiddle.setLayout(new GridLayout(1,1));
centermiddle.add(CommentsTextArea);
add(centermiddle, BorderLayout.CENTER);
centerbottom = new JPanel();
centerbottom.setLayout(new GridLayout(1,3));
centerbottom.add (Save);
centerbottom.add(Retrieve);
add(centerbottom, BorderLayout.SOUTH);
ButtonHandler handler = new ButtonHandler();
Save.addActionListener( handler);
Retrieve.addActionListener(handler);
private class ButtonHandler implements ActionListener
public void actionPerformed(ActionEvent event)
String Namein = NameTextArea.getText();
String Datein = DateTextArea.getText();
String Commentsin = CommentsTextArea.getText();
int Lessonin = Integer.parseInt(LessonTextArea.getText());
if(event.getSource()==Save)
DMO.Save(Namein, Datein, Commentsin, Lessonin);
if(event.getSource()==Retrieve)
if(Lessonin >= 1 && Lessonin <= 10)
LessonRecord r = (DMO.Retrieve(Namein, Lessonin));
else
String errormess = "Lesson Number must be between 1 and 10!";
CommentsTextArea.setText(errormess);
}The third class is the DataManager class which handles the actual file i/o.
import java.io.*;
import java.util.*;
public class DataManager implements Serializable
//private String Path = "P:\\D00766703\\CET431\\Assign5";
private String Path = "C:\\Java";
FileInputStream fin;
FileOutputStream fout;
ObjectInputStream oin;
ObjectOutputStream oout;
public String Retrieve(String name, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
if (f.exists() == true)
try
if(fin == null)
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
LessonRecord r[] = oin.readObject();
if(fin.available() == 0)
oout.close();
fout.close();
return r[lesson - 1];
catch(IOException ioe)
System.out.print(ioe);
else
LessonRecord LR = new LessonRecord();
LR.date = " ";
LR.comment = "File Not Found";
return LR;
/*create file object for Path\\Name
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
* return |r[lesson - 1];
*else file does NOT EXIST
* LessonRecord LR = new LessonRecord();
* LR.date = " ";
* LR.comment = error message;
* return LR;
public void Save(String name, String date, String comment, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord |r[];
if (f.exists() == true)
try
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
LessonRecord r[] = oin.readObject();
catch(IOException ioe)
System.out.print(ioe);
else
r = new LessonRecord[10];
r[lesson - 1] = new LessonRecord(date, comment);
fout = new FileOutputStream(itemFile, true);
oout = new ObjectOutputStream(fout);
oout.write(r);
oout.close();
fout.close();
/*create file object for Path\\Name
*LessonRecord |r[];
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
*else
* |r = new LessonRecord[10];
*|r[lesson - 1] = new LessonRecord(date, comment);
*createfileoutputstream(BaseDir\\Name);
*createobjectoutputstream - oout
*oout.write(|r);
*closeobjectstream
*closefilestream
}And the fourth class is the LessonRecord class which is serializable and has the date and comments variables.
import java.io.Serializable;
public class LessonRecord implements Serializable
public String Date;
public String Comment;
/** Creates a new instance of LessonRecord */
public LessonRecord()
Date = "";
Comment = "";
public LessonRecord(String Datein, String Commentin)
Date = Datein;
Comment = Commentin;
}I could have sworn that the professor said to make it |r for the account records variable names, but I always get errors when I do that, and I need to know how to cast to an array too.hi Friend,
I have made some modification to your code. and try this...I think it will help you...
/*guiLayout.java*/
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class guiLayout extends JFrame{
private JPanel centertop;
private JPanel centermiddle;
private JPanel centerbottom;
private JLabel dateLabel;
private JLabel nameLabel;
private JLabel lessonLabel;
private JLabel commentsLabel;
private JTextArea DateTextArea;
private JTextArea NameTextArea;
private JTextArea LessonTextArea;
private JTextArea CommentsTextArea;
private JButton Save;
private JButton Retrieve;
private String tempDay[];
private DataManager DMO;
/** Creates a new instance of guiLayout */
public guiLayout()
super("Drive Application");
DMO=new DataManager();
setLayout(new FlowLayout());
dateLabel = new JLabel("Date (mm/dd/yy)");
nameLabel = new JLabel("Name");
lessonLabel = new JLabel("Lesson (1-10)");
commentsLabel = new JLabel("Comments");
DateTextArea = new JTextArea(1, 7);
NameTextArea = new JTextArea(1, 15);
LessonTextArea = new JTextArea(1, 2);
CommentsTextArea = new JTextArea(6, 30);
Save = new JButton( "Save");
Retrieve = new JButton( "Retrieve");
//insert into GUI
//TOP
centertop = new JPanel();
centertop.add(nameLabel);
centertop.add(NameTextArea);
centertop.add(lessonLabel);
centertop.add(LessonTextArea);
centertop.add(dateLabel);
centertop.add(DateTextArea);
centertop.setLayout(new GridLayout(6,1));
add(centertop, BorderLayout.NORTH);
centermiddle = new JPanel();
centermiddle.setLayout(new GridLayout(1,1));
centermiddle.add(CommentsTextArea);
add(centermiddle, BorderLayout.CENTER);
centerbottom = new JPanel();
centerbottom.setLayout(new GridLayout(1,3));
centerbottom.add (Save);
centerbottom.add(Retrieve);
add(centerbottom, BorderLayout.SOUTH);
ButtonHandler handler = new ButtonHandler();
Save.addActionListener( handler);
Retrieve.addActionListener(handler);
private class ButtonHandler implements ActionListener
public void actionPerformed(ActionEvent event)
String Namein = NameTextArea.getText();
int Lessonin = Integer.parseInt(LessonTextArea.getText());
if(event.getSource()==Save)
String Datein = DateTextArea.getText();
String Commentsin = CommentsTextArea.getText();
DMO.Save(Namein, Datein, Commentsin, Lessonin);
if(event.getSource()==Retrieve)
if(Lessonin >= 1 && Lessonin <= 10)
LessonRecord r = (DMO.Retrieve(Namein, Lessonin));
System.out.println("Retrieve:"+ r.Comment+":"+r.Date);
else
String errormess = "Lesson Number must be between 1 and 10!";
CommentsTextArea.setText(errormess);
/*DataManager.java*/
import java.io.*;
import java.util.*;
public class DataManager implements Serializable
//private String Path = "P:\\D00766703\\CET431\\Assign5";
private String Path = "C:/Java";
FileInputStream fin;
FileOutputStream fout;
ObjectInputStream oin;
ObjectOutputStream oout;
public LessonRecord Retrieve(String name, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord[] r=null;
if (f.exists() == true)
try
if(fin == null)
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
r= (LessonRecord[])oin.readObject();
System.out.println(r[lesson-1].Comment+":"+r[lesson-1].Date);
catch(IOException ioe)
System.out.print(ioe);
catch(ClassNotFoundException c){
c.printStackTrace();
finally
try {
if(fin!=null)fin.close();
if(oin!=null)oin.close();
} catch (IOException ex) {
ex.printStackTrace();
else
LessonRecord LR = new LessonRecord();
LR.Date = " ";
LR.Comment = "File Not Found";
return LR;
/*create file object for Path\\Name
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
* return |r[lesson - 1];
*else file does NOT EXIST
* LessonRecord LR = new LessonRecord();
* LR.date = " ";
* LR.comment = error message;
* return LR;
return r[lesson - 1];
public void Save(String name, String date, String comment, int lesson)
String itemFile = Path + name + ".ser";
File f = new File(itemFile);
LessonRecord r[]=new LessonRecord[10];
if (f.exists() == true)
try
fin = new FileInputStream(itemFile);
oin = new ObjectInputStream(fin);
r = (LessonRecord[])oin.readObject();
catch(IOException ioe)
System.out.print(ioe);
catch(ClassNotFoundException c){
c.printStackTrace();
finally
try {
if(fin!=null)fin.close();
if(oin!=null)oin.close();
} catch (IOException ex) {
ex.printStackTrace();
else
r = new LessonRecord[10];
try
r[lesson - 1] = new LessonRecord(date, comment);
fout = new FileOutputStream(itemFile);
oout = new ObjectOutputStream(fout);
oout.writeObject(r);
oout.flush();
catch(IOException ioe)
finally
try {
if(fout!=null)fout.close();
if(oout!=null)oout.close();
} catch (IOException ex) {
ex.printStackTrace();
/*create file object for Path\\Name
*LessonRecord |r[];
*if file exists
* create fileinputstream
* create objectinputstream - oin
* read array of lesson records
* LessonRecord |r[] = oin.readObject(); need cast to array here
* close object input stream and file input stream
*else
* |r = new LessonRecord[10];
*|r[lesson - 1] = new LessonRecord(date, comment);
*createfileoutputstream(BaseDir\\Name);
*createobjectoutputstream - oout
*oout.write(|r);
*closeobjectstream
*closefilestream
}main.java and LessonRecord.java does not have any changes so you use the old code....
Thanks
Edited by: rajaram on Sep 28, 2007 1:24 PM -
Using two ports or Using two Input / Outputs
I'm explaining my project. It s almost done. I send message and data to server and it is stored in server. From the begining I'm using
BufferedReader - PrintWriterAnd I cannot send files because they are binary. I have to use
BufferedInputStream - BufferedOutputStreamI cannot change my input / output. So I found two solutions:
1) Connecting from another port with another socket. -> Using this it blames the ports. I cannot transfer anything from my first port.
2) Using another input / output streams from the same port. -> I didn't tried it . Does anyone tried this. Is it possible to do this.
That's the end of my project. I will give the name of project who gives me a good answer :D
Best Regards, Bulent.I cannot change my input / output. Why not?
So I found two solutions:
1) Connecting from another port with another
er socket. -> Using this it blames the ports. I
cannot transfer anything from my first port.Huh? Unless the server stops you, there is nothing in sockets that prevents you, as a client, from connecting to the server twice.
2) Using another input / output streams from the
he same port. -> I didn't tried it . Does anyone
tried this. Is it possible to do this. Nothing stops you from using an InputStream to create two different buffered solutions.
I wouldn't even attempt this myself. It would create a very fragile application. But you could try it. You would need to carefully control when the two connections were used and in particular when they were closed. You could do this by wrapping both in a class. -
How to execute function takes user defined type parameters as input &output
Hi All,
I want to execute a function which takes user defined type as input & output parameters. But i don't know how to execute that function in pl/sql statements.
CREATE TYPE T_INPUT AS OBJECT
USER VARCHAR2(255),
APPLICATION VARCHAR2(255),
REFERENCE VARCHAR2(30)
) NOT FINAL;
CREATE TYPE T_ID UNDER T_INPUT
E_ID VARCHAR2 (50),
CODE VARCHAR2 (3),
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C_TYPE VARCHAR2 (1)
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R_STATUS NUMBER(10),
E_DESC_LANG_1 VARCHAR2(1000),
E_DESC_LANG_2 VARCHAR2(1000),
A_REFERENCE VARCHAR2(30)
) NOT FINAL;
CREATE TYPE T_INFO UNDER T_OUTPUT
E_INFO XMLTYPE
CREATE FUNCTION Get_Dtls
I_DETAILS IN T_ID,
O_DETAILS OUT T_INFO
RETURN NUMBER AS
END;
Here
1. T_ID is an input parameter which is a combination of T_ID + T_INPUT,
2. T_INFO is an output parameter which is a combination of T_INFO + T_OUTPUT.
Here i'll assign the T_ID values.
--- T_INPUT values
USER = "admin";
APPLICATION = "test";
REFERENCE = "null";
---- T_ID values
E_ID = "1234";
CODE = "TTT";
SERVICE = "NEW";
C_TYPE = "P";
Now i want to execute Get_Dtls function with T_ID,T_INFO parameters in pl/sql statements.
I want to catch the E_INFO value from T_INFO type.
How can i Do this ?
Pls Help. Thanxs in advance.
Anil.I am very new to this. New to Oracle, PL/SQL, OO programming or testing?
set serveroutput on
declare
tst_obj ctype;
begin
tst_obj := pkg.proc(11);
dbms_output.put_line('id='||tst_obj.id||'::code='||tst_obj.code||'::usage='||tst_obj.usage);
end;
/Generally I disapprove of the use of DBMS_OUTPUT (for just about anything) but it is sufficient to demonstrate the basic principle.
Really you should start using proper testing practices, ideally with an automated test harness like QUTE.
Cheers, APC
Blog : http://radiofreetooting.blogspot.com/ -
How to bind complex input/output types in web service data control
Hi,
I have created data control using external web service for simple input & output data type and its working fine.
But I don't know how it can be done for complex data types.
My external Web services have complex input & output types. Such as java object which contains another java object again it contains another java object or arry or java collection etc.
Each my service has one complex input data type and for this no user input is require so how I can do it without using any component for it.
I want to bind my page components with this input & output type.
What is the best approach to do this and how to bind screen component.
Regards,
DevangHi,
Thanks frank.
I already check this link before posting this so if you have any other link then kindly reply.
Regards,
Devang -
Input/Output And Method Not Found Problem
Ok so firstly I think I should apologise on two fronts.
Firstly, 'cause this is probably posted in the wrong board but I'm not sure this was suitable for the Swing board just 'cause I've been using Swing? And secondly 'cause the code I'm gonna post is so shoddy I would think this constitutes as flaim-bait. >_>
In my defense this is purely for a little class project to give something to write some documentation on so I'm really not too bothered about the efficiency or ace-mazingness of the end result. I just want it to work.
To the problem at hand.
I'm trying to write a program that asks the user a question and then outputs their answer to a file, from which a tally of answers can later be made for the purpose of displaying "results".
My problem is I've been having problems with the input/output of saving the answers given to the program.
I'm still learning and input/output is probably my weakest subject (other than, y'know, being good at Java). I've had a bash at it in the following code but all it does it overwrite what is in the file with a single answer so no list of results accumulate. I generally don't have an idea what to try for that one so any pointers would be appreciated.
Also, my second problem is, in trying to gather results by tallying what is contained in the file, I've run across a problem with the charAt() method not being found and I'm not sure why. Isn't that method a part of java.lang?
Here's the code thus far:
//libraries
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.io.*;
class CaseStudy {
public static void main(String args[]) {
GUI maininterface = new GUI();
maininterface.setupMenu();
maininterface.display();
class GUI {
//for the actionlisteners
int whatframe = 0;
//creates mainframe and border content panel
JFrame mainframe = new JFrame("Survey Client");
JPanel borderpanel = new JPanel(), bottompanel = new JPanel();
JButton quizbutton = new JButton("Take the quiz"), tallybutton = new JButton("Show Results"), submitbutton = new JButton("Submit Results"), menubutton = new JButton("Return To Menu");
QuizQuestions toppanel = new QuizQuestions();
QuizResults toppanel2 = new QuizResults();
GUI() {
//sets border in borderpanel, this spaces the main content in from the sides of the window
borderpanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//sets up the frame and panels and adds on borders
mainframe.setDefaultCloseOperation(mainframe.EXIT_ON_CLOSE); // exits java when clicking on close on main frame
mainframe.getContentPane().add(borderpanel); // adds the panel as a component to the frame, the panel can hold stuffs
borderpanel.setLayout(new BoxLayout(borderpanel, BoxLayout.PAGE_AXIS));// page_axis means it'll layout vertically
bottompanel.setLayout(new BoxLayout(bottompanel, BoxLayout.LINE_AXIS));// line_axis means it'll layout horizontally
//gives button an action
quizbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupQuiz();
tallybutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
if(whatframe == 1) setupResults();
else {
int rusure = JOptionPane.showConfirmDialog(null, "Are you sure you wish to show results? Any current quiz answers won't be saved.", "Please Choose One", JOptionPane.YES_NO_OPTION);
if(rusure == JOptionPane.YES_OPTION) setupResults();
menubutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupMenu();
submitbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
toppanel.doQuiz();
borderpanel.add(bottompanel);
public void setupMenu() {
if(whatframe == 3) {
bottompanel.remove(menubutton);
borderpanel.remove(toppanel2);
whatframe = 1;
//adds components and lays them out
bottompanel.add(quizbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
display();
public void setupQuiz() {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
whatframe = 2;
bottompanel.add(submitbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
borderpanel.add(toppanel);
display();
public void setupResults() {
if(whatframe == 1) {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
else {
bottompanel.remove(submitbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
borderpanel.remove(toppanel);
whatframe = 3;
bottompanel.add(menubutton);
borderpanel.add(toppanel2);
display();
public void display() {
//sets the size of the frame around it's components and then shows it
mainframe.pack();
mainframe.setVisible(true);
mainframe.validate(); //makes referenced container relayout it's components
class QuizQuestions extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel(), pop1 = new JPanel(), pop2 = new JPanel(), pop3 = new JPanel(), pop4 = new JPanel();
JFormattedTextField ques = new JFormattedTextField(), op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
JButton bop1 = new JButton("1"), bop2 = new JButton("2"), bop3 = new JButton("3"), bop4 = new JButton("4");
char answer;
QuizQuestions() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
pop1.setLayout(new BoxLayout(pop1, BoxLayout.LINE_AXIS));
pop2.setLayout(new BoxLayout(pop2, BoxLayout.LINE_AXIS));
pop3.setLayout(new BoxLayout(pop3, BoxLayout.LINE_AXIS));
pop4.setLayout(new BoxLayout(pop4, BoxLayout.LINE_AXIS));
this.add(popm);
popm.add(ques);
popm.add(pop1);
popm.add(pop2);
popm.add(pop3);
popm.add(pop4);
pop1.add(op1);
pop1.add(bop1);
pop2.add(op2);
pop2.add(bop2);
pop3.add(op3);
pop3.add(bop3);
pop4.add(op4);
pop4.add(bop4);
//sets up question text fields
ques.setEditable(false);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
bop1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'a';
bop2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'b';
bop3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'c';
bop4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'd';
Question1();
public void doQuiz() {
loadsave.save(answer);
public void Question1() {
ques.setValue("Who's your favourite X-Men character?");
op1.setValue("Cyclops");
op2.setValue("Xavier");
op3.setValue("Wolverine");
op4.setValue("Rogue");
class QuizResults extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel();
JFormattedTextField op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
int[] answerarray = new int[4];
QuizResults() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
this.add(popm);
popm.add(op1);
popm.add(op2);
popm.add(op3);
popm.add(op4);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
answerarray = loadsave.load();
op1.setValue(answerarray[0]);
op2.setValue(answerarray[1]);
op3.setValue(answerarray[2]);
op4.setValue(answerarray[3]);
class LoadingSaving {
public void save(char answer) {
FileReader fr;
FileWriter fw;
BufferedReader br;
String s;
try {
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
fr = new FileReader("casestudyoutput.txt");
fw = new FileWriter("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) s = "x";
else s = br.readLine();
s = s + answer;
fw.write(s);
fr.close();
fw.close();
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return;
public int[] load() {
FileReader fr;
BufferedReader br;
int[] answerarray = new int[3];
String s;
long length;
int a = 0, b = 0, c = 0, d = 0;
answerarray[0] = 0;
answerarray[1] = 0;
answerarray[2] = 0;
answerarray[3] = 0;
try {
fr = new FileReader("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) return answerarray;
else s = br.readLine();
length = s.length();
for(int i = 0; i < length; i++) {
char ch = charAt(i); //ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
switch(ch) {
case 'a':
a++;
break;
case 'b':
b++;
break;
case 'c':
c++;
break;
case 'd':
d++;
break;
answerarray[0] = a;
answerarray[1] = b;
answerarray[2] = c;
answerarray[3] = d;
fr.close();
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return answerarray;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return answerarray;
return answerarray;
}Any pointers/tips/solutions/angry posts to tell me to stop trying to learn Java would be greatly appreciated.
Thanks in advance!
Oh, and in trying to work with it a bit further I realised I'm having a few problems with runtime errors due to exceptions. The first was due to the array being assigned out of bounds (fixed in the above code). But the second reads the following:
Exception in thread "main" java.lang.NullPointerException
at Loadingsaving.load(CaseStudy.java:330)
at QuizResults.(init)(CaseStudy.java.259)
at GUI.(init)(CaseStudy.java:34)
at CaseStudy.main(CaseStudy.java:15)Not quite sure what this one means or how to handle it. =\
Edited by: ThePermster on May 19, 2008 8:08 AMA NullPointerException means a method has been called on a null object, or a variable that isn't pointing to any object. Your Exception points to line 330, which is:
length = s.length();A NPE on that line means that s is null. So let's look at where s is set:
if (br.readLine() == null) return answerarray;
else s = br.readLine();s gets it's value from br.readLine(), so that method must be returning null. You have a logical error here. Look at your If-Else. It reads a line, makes sure it isn't null...then it reads another line. Well what if that line is null? You are performing 2 reads here instead of 1.
Since your If condition returns a value, there's no need for an Else. The code will continue on until it reaches another return. Try this:
s = br.readLine();
if (s == null) return answerarray; -
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I am trying to figure out a way to automatically retrieve the complex type specified as a task input/output without hard coding the name of the complex type. So far I have a process with two reporting activities and a task, built as a custom technologies with specified Input and Output from the process context. Then I built a UI where I created an OData model, whose properties I bound to properties of the model, but this happened by exactly specifying the name of the complex type in the controller:
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customerDataPanel.bindElement("/InputData('" + taskId + "')", {expand : "Customer"});
and the exact attribute names in the view:
oMatrix.createRow(
new sap.ui.commons.Label({text : "First Name", design : sap.ui.commons.LabelDesign.Bold }),
// property binding of a text field to the attribute in Customer object
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oMatrix.createRow(
new sap.ui.commons.Label({text : "Last Name", design : sap.ui.commons.LabelDesign.Bold }),
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new sap.ui.commons.Label({text : "Currency", design : sap.ui.commons.LabelDesign.Bold }),
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Any suggestions will be much appreciated.Hi Deepa,
How about adding another action to the "Add Company" Button which will also trigger the search?
See:
http://help.sap.com/saphelp_nwce711/helpdata/en/48/17fbc3a3050be8e10000000a42189d/frameset.htm
And:
http://help.sap.com/saphelp_nwce711/helpdata/en/ae/facedea03743f18aaf2edf12465fd8/frameset.htm
For more details.
Hope this helps.
Regards.
Omer. -
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