A small java construct(iam a novice)
public class Test{
public static void main(String[] args){
int i=0;
for(int j=0;j<10;j++){
i=i++;
System.out.println(i);
OUTPUT is '0'.but how?
I expected 10.
how i++ works here.
public class Test{
public static void main(String[] args){
int i=0;
for(int j=0;j<10;j++){
i=i++;
System.out.println(i);
OUTPUT is '0'.but how?
I expected 10.
how i++ works here.Any teacher that assigns this question should be shot for being a moron. If every CS 101 teacher assigning this question this year?
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Need help in writing a small java code
Hi,
I have a small requirement where I need write a small java code. I am thinking of using array. Please suggest if you know the solution:
1. Need to compare user logon id is preset in the lookup table or not.
2. If user id present in the lookup then send type "A" mail
3. If user id in not present in the lookup then send type "B" email.
Please suggest.
Thanks,
Kalpana.use this code . you have to pass userlogin and lookup name
Public String GetEmail(String UserLogin,String lookupcode)
String email;
try{
tcLookupOperationIntf lookupIntf = Platform.getService(tcLookupOperationIntf.class);
HashMap<String, String> lookupValues = getLookupHashMap(lookupIntf, lookupCode);
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else
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private HashMap<String, String> getLookupHashMap(tcLookupOperationsIntf lookupOperationsIntf, String lookupCode)throws tcAPIException,tcInvalidLookupException,tcColumnNotFoundException {
HashMap<String, String> lookupMap = new HashMap<String, String>();
tcResultSet resultLookupHashMap = lookupOperationsIntf
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int countResultLookupHashMap = resultLookupHashMap.getRowCount();
if (countResultLookupHashMap > 0) {
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need some help with a small Java assignment I am doing.
When I compile the code i get 2 errors they are
invalid method declaration: return type required
public CreateRandomFile() LINE 87
^
cannot resolve symbol
new CreateRandomFile(); LINE 112
^
Any help is greatly appreciated
**********CODE BEGINS HERE ***********************
import javax.swing.*;
import java.io.*;
import BreezySwing.*;
public class RandomTest extends GBFrame
JLabel accLabel = addLabel("Account Number",1,1,1,1);
IntegerField accField = addIntegerField(0,1,2,1,1);
JLabel firstLabel = addLabel("First Name",2,1,1,1);
JTextField firstField = addTextField("",2,2,1,1);
JLabel lastLabel = addLabel("Last Name",3,1,1,1);
JTextField lastField = addTextField("",3,2,1,1);
JTextArea resultArea = addTextArea("",4,1,2,3);
JButton acceptButton = addButton("Accept",7,1,2,1);
JButton accessButton = addButton("Access",8,1,2,1);
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lastField.setText("");
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private Record getRecord()
Record record = new Record();
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try{
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file.seek((accountNumber -1)*Record.size());
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System.out.println("Invalid Number Format");
catch (IOException io)
System.out.println("Error reading file");
return record;
public createRandomFile() // <----- ERROR HERE
Record blank = new Record();
openFile();
try{
file = new RandomAccessFile("acc.dat", "rw");
for (int i=0;i<100;i++)
blank.write(file);
System.exit(0);
catch (IOException e )
System.out.println("File doesn't exist");
System.out.println("Invalid File Name");
System.exit(1);
public static void main(String args[])
JFrame tpo = new RandomTest();
tpo.setTitle("Assignment 1");
tpo.setSize(200,330);
tpo.setVisible(true);
new createRandomFile(); // <--- ERROR HERE
}I changed the things you suggested by have a new error of
cannot resolve symbol
symbol : method createRandomFile ()
location: class javax.swing.JFrame
tpo.createRandomFile();
^
**************new code here***************************
import javax.swing.*;
import java.io.*;
import BreezySwing.*;
public class RandomTest extends GBFrame
JLabel accLabel = addLabel("Account Number",1,1,1,1);
IntegerField accField = addIntegerField(0,1,2,1,1);
JLabel firstLabel = addLabel("First Name",2,1,1,1);
JTextField firstField = addTextField("",2,2,1,1);
JLabel lastLabel = addLabel("Last Name",3,1,1,1);
JTextField lastField = addTextField("",3,2,1,1);
JTextArea resultArea = addTextArea("",4,1,2,3);
JButton acceptButton = addButton("Accept",7,1,2,1);
JButton accessButton = addButton("Access",8,1,2,1);
JButton clearButton = addButton("Clear",9,1,2,1);
private RandomAccessFile file;
public void buttonClicked(JButton buttonObj)
if (buttonObj == acceptButton)
else
if (buttonObj == accessButton)
else
accField.setNumber(0);
resultArea.setText("");
firstField.setText("");
lastField.setText("");
private void openFile()
FileOutputStream foStream = new FileOutputStream ("acc.dat");
ObjectOutputStream doStream = new ObjectOutputStream (foStream);
if ("acc.dat" == null || "acc.dat".equals(""))
System.out.println("Invalid File Name");
else
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file = new RandomAccessFile ("acc.dat","rw");
catch (IOException e)
System.out.println("File does not exist or Invalid File Name");
private Record getRecord()
Record record = new Record();
int accountNumber;
try{
accountNumber = Integer.parseInt(accField.getText());
if (accountNumber <1 || accountNumber >100)
System.out.println("Account doesn't exist");
return null;
file.seek((accountNumber -1)*Record.size());
record.read(file);
catch (NumberFormatException nfe)
System.out.println("Account does not exist");
System.out.println("Invalid Number Format");
catch (IOException io)
System.out.println("Error reading file");
return record;
public void createRandomFile()
Record blank = new Record();
openFile();
try{
file = new RandomAccessFile("acc.dat", "rw");
for (int i=0;i<100;i++)
blank.write(file);
System.exit(0);
catch (IOException e )
System.out.println("File doesn't exist");
System.out.println("Invalid File Name");
System.exit(1);
public static void main(String args[])
JFrame tpo = new RandomTest();
tpo.setTitle("Assignment 1");
tpo.setSize(200,330);
tpo.setVisible(true);
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Can any one help me where i will get very small java examples or codes to understand basic java api. Thank you very much for you help.
http://javaboutique.internet.com/
when i first started i found this site a immense help
since i am one of those people who learn by doing
not by falling asleep reading big articles and long winded books.
thier is tutorials and stuff all over this site with small tutorials.
best of all tons of programs and code for it that you can copy and paste or download in a zip file -
A small Java Problem for java Experts
Hi Guys...
I have a small problem with my program...
Tha program I am using consist of several frames where one invokes the other in row.
These are the classes I am using:
the FIRST class://THIS CLASS IS NOT COMPLETE
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* LabelDemo.java is a 1.4 application that needs one other file:
* images/middle.gif
public class CSVloader extends JPanel implements ActionListener {
ImageIcon icon ;
JLabel label;
JButton theButton1;
JButton saveButton;
JButton displayButton;
JButton displayStyleButton;
JFileChooser fc;
final boolean shouldFill = true;
final boolean shouldWeightX = true;
public CSVloader() {
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridbag);
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
theButton1 = new JButton("Choose source File");
theButton1.addActionListener(this);
if (shouldWeightX) {
c.weightx = 0.5;
c.gridx = 0;
c.gridy = 0;
gridbag.setConstraints(theButton1, c);
add(theButton1);
displayStyleButton = new JButton("CSV Display style");
displayStyleButton.addActionListener(this);
c.gridx = 0;
c.gridy = 2;
gridbag.setConstraints(displayStyleButton, c);
add(displayStyleButton);
displayButton = new JButton("Display");
displayButton.addActionListener(this);
c.gridx = 1;
c.gridy = 0;
gridbag.setConstraints(displayButton, c);
add(displayButton);
saveButton = new JButton("Save");
saveButton.addActionListener(this);
c.gridx = 0;
c.gridy = 1;
gridbag.setConstraints(saveButton, c);
add(saveButton);
icon = new ImageIcon("c:/applets/CSVlogo.gif");
//Create the first label.
label = new JLabel(icon);
c.ipady = 45; //make this component tall
c.weightx = 0.0;
c.gridwidth = 1;
c.gridx = 1;
c.gridy = 1;
gridbag.setConstraints(label, c);
add(label);
fc = new JFileChooser();
public Dimension getDimension(int hight, int width) {
Dimension theDimension = new Dimension(hight,width);
return theDimension;
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if (e.getSource() == theButton1) {
int returnVal = fc.showOpenDialog(CSVloader.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would open the file.
//Handle save button action.
} else
if (e.getSource() == displayButton) {
try {
Runtime.getRuntime().exec("cmd /c start " + "c:\\applets\\displayData.html");
catch(IOException io)
System.err.println("Caught IOException: " +
io.getMessage());
}else
if (e.getSource() == displayStyleButton)
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("Display Style");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
DisplayStyle newContentPane = new DisplayStyle();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
else
if (e.getSource() == saveButton) {
int returnVal = fc.showOpenDialog(CSVloader.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File saveFile = fc.getSelectedFile();
//This is where a real application would open the file.
public static void main(String[] args) {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("LabelDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
CSVloader newContentPane = new CSVloader();
newContentPane.setBackground(Color.WHITE);
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
// Runtime.getRuntime().exec("cmd /c start " + "....\\docs\\index.html");
this is the SECOND class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DisplayStyle extends JPanel implements ActionListener{
public static final int FIRST_OPTION = 0;
public static final int SECOND_OPTION = 1;
public static final int THIRD_OPTION = 2;
public static final int THE_BUTTON_OPTION =3;
public static final int ERROR = -1;
public int selectedOption = ERROR;
static String table = "Table";
static String tableNoBorders = "Table without Borders";
static String highlightedTable = "Highlighted Table without Borders";
public JRadioButton theTable;
public JRadioButton theTable2;
public JRadioButton theTable3;
public JButton theButton;
public String theName;
public DisplayStyle ()
theTable = new JRadioButton(table);
theTable.setActionCommand(""+ FIRST_OPTION);
theTable.addActionListener(this);
theTable.setMnemonic(KeyEvent.VK_B);
theTable.setSelected(true);
theTable2 = new JRadioButton(tableNoBorders);
theTable2.setActionCommand(""+ SECOND_OPTION);
theTable2.addActionListener(this);
theTable2.setMnemonic(KeyEvent.VK_B);
theTable3 = new JRadioButton(highlightedTable);
theTable3.setActionCommand(""+ THIRD_OPTION);
theTable3.addActionListener(this);
theTable3.setMnemonic(KeyEvent.VK_B);
theButton = new JButton("OK");
theButton.setActionCommand(""+ THE_BUTTON_OPTION);
theButton.addActionListener(this);
ButtonGroup group = new ButtonGroup();
group.add(theTable);
group.add(theTable2);
group.add(theTable3);
JLabel theLabel = new JLabel("Choose the style of Display");
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(theLabel);
radioPanel.add(theTable);
radioPanel.add(theTable2);
radioPanel.add(theTable3);
radioPanel.add(theButton);
add(radioPanel, BorderLayout.LINE_START);
public void actionPerformed (ActionEvent e) {
if(e.getSource() == theButton)
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame1 = new JFrame("The Format");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Formats newFormat = new Formats();
newFormat.setOpaque(true); //content panes must be opaque
frame1.setContentPane(newFormat);
//Display the window.
frame1.pack();
frame1.setVisible(true);
selectedOption = Integer.parseInt(e.getActionCommand().trim());
public DisplayStyle getInstance(){
return this;
this is the THIRD class:
mport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Formats extends JPanel implements ActionListener{
public static final int FIRST_OPTION = 0;
public static final int SECOND_OPTION = 1;
public static final int THIRD_OPTION = 2;
public static final int FOURTH_OPTION = 4;
public static final int THE_BUTTON_OPTION =3;
public static final int ERROR = -1;
public int selectedOption = ERROR;
static String standardFormat = "Date first";
static String timeFirstFormat = "Time First";
static String typeFirstFormat = "Type of call first";
static String extFirstFormat = "Extension first";
public JButton theButton;
public JRadioButton theStandardButton1 ;
public JRadioButton theTimeButton;
public JRadioButton theTypeButton;
public JRadioButton theExtButton ;
public Formats()
theStandardButton1 = new JRadioButton(standardFormat);
theStandardButton1.setMnemonic(KeyEvent.VK_B);
theStandardButton1.setSelected(true);
theTimeButton = new JRadioButton(timeFirstFormat);
theTimeButton.setMnemonic(KeyEvent.VK_B);
theTypeButton = new JRadioButton(typeFirstFormat);
theTypeButton .setMnemonic(KeyEvent.VK_B);
theExtButton = new JRadioButton(extFirstFormat);
theExtButton.setMnemonic(KeyEvent.VK_B);
ButtonGroup group = new ButtonGroup();
group.add(theStandardButton1);
group.add(theTimeButton);
group.add(theTypeButton);
group.add(theExtButton);
JLabel newLabel = new JLabel("Choose the Format type for the data to be displayed");
theButton = new JButton("OK");
theButton.addActionListener(this);
theButton.setActionCommand("" + THE_BUTTON_OPTION);
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(newLabel);
radioPanel.add(theStandardButton1);
radioPanel.add(theTimeButton);
radioPanel.add(theTypeButton);
radioPanel.add(theExtButton);
radioPanel.add(theButton);
add(radioPanel, BorderLayout.LINE_START);
public void actionPerformed (ActionEvent e) {
if(e.getSource() == theButton)
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("The Font");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
TableFonts newFont = new TableFonts();
newFont.setOpaque(true); //content panes must be opaque
frame.setContentPane(newFont);
//Display the window.
frame.pack();
frame.setVisible(true);
selectedOption = Integer.parseInt(e.getActionCommand().trim());
public Formats getInstance(){
return this;
and the last class:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TableFonts extends JPanel implements ActionListener{
static String standardFont = "Standard Font";
static String boldFont = "Bold Font";
static String italicFont = "Italic Font";
static String monospaceFont = "Monospace Font";
public JRadioButton theStandardButton ;
public JRadioButton theBoldButton;
public JRadioButton theItalicButton;
public JRadioButton theMonospaceButton ;
public TableFonts()
theStandardButton = new JRadioButton(standardFont);
theStandardButton.setMnemonic(KeyEvent.VK_B);
theStandardButton.setSelected(true);
theBoldButton = new JRadioButton(boldFont);
theBoldButton.setMnemonic(KeyEvent.VK_B);
theItalicButton = new JRadioButton(italicFont);
theItalicButton .setMnemonic(KeyEvent.VK_B);
theMonospaceButton = new JRadioButton(monospaceFont);
theMonospaceButton.setMnemonic(KeyEvent.VK_B);
ButtonGroup group = new ButtonGroup();
group.add(theStandardButton);
group.add(theBoldButton);
group.add(theItalicButton);
group.add(theMonospaceButton);
theStandardButton.addActionListener(this);
theBoldButton.addActionListener(this);
theItalicButton.addActionListener(this);
theMonospaceButton.addActionListener(this);
JLabel newLabel = new JLabel("Choose the correct font for the data to be displayed");
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(newLabel);
radioPanel.add(theStandardButton);
radioPanel.add(theBoldButton);
radioPanel.add(theItalicButton);
radioPanel.add(theMonospaceButton);
add(radioPanel, BorderLayout.LINE_START);
public void actionPerformed(ActionEvent e) {
The problem I am getting is the Number format exception when the OK button of the class Formats is clicked...
here is the error I am getting:
java.lang.NumberFormatException: For input string: "OK"
at java.lang.NumberFormatException.forInputString(NumberFormatException.
java:48)
at java.lang.Integer.parseInt(Integer.java:426)
at java.lang.Integer.parseInt(Integer.java:476)
at Formats.actionPerformed(Formats.java:80)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:17
64)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abstra
ctButton.java:1817)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:419)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5134)
at java.awt.Component.processEvent(Component.java:4931)
at java.awt.Container.processEvent(Container.java:1566)
at java.awt.Component.dispatchEventImpl(Component.java:3639)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
at java.awt.Container.dispatchEventImpl(Container.java:1609)
at java.awt.Window.dispatchEventImpl(Window.java:1590)
at java.awt.Component.dispatchEvent(Component.java:3480)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
COULD YOU GUYS PLEASE TELL ME HOW TO GET AROUND THIS PROBLEM:
THANKS...It's in this line:
selectedOption = Integer.parseInt(e.getActionCommand().trim());
Kind regards,
Levi
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ssage "(HEX 0xBFFF003C) insufficient system resources to perform necessary memory allocation" message when attemping execution of a VI containing correctly wired visa Write and Read icons. Visa has identified the resource and through Ibic I can communicateI am getting the error code -1073807300
ssage "(HEX 0xBFFF003C) insufficient system resources to perform necessary memory allocation" message when attemping execution of a VI containing correctly wired visa Write and Read icons. Visa has identified the resource and through Ibic I can communicateThank for the response. I am using a GPIB-ENET/100. The
resource name used is "GIGA_8542" an alias for GPIB4::13::INSTR, the Gigatronics power meter at address 13 which is connected to the gpib-enet/100. I am making a *IDN? call to the device using a "VISA WRITE". There is a "VISA READ" configured for the test equipment response. The error code -1073807300 occurs at the output of the "VISA WRITE". Again Visa has identified the resource and through Ibic I can communicate. Thanks. -
How to use java to create an XML document from an SQL database?
Hi,
I'm a complete novice at XML and have only recently started programming in Java.
I'm currently trying to develop a package in Java 1.1.8 which requires a set of very specifically formatted XML documents. These documents would need to be updated regularly by people with no knowledge of Java and I would like to make it as simple as possible.
Since the data will already be in an SQL database, I thought it might be possible to generate the XML documents from the data using a small Java application, but I'm not too sure how to go about this or if this is even possible! Any help or pointers in the right direction would be very much appreciated.
LouiseDo you have the option of upgrading to a newer version of the JDK?
JAXB does what you are wanting very easily. Also there are tools if you don't want to write your own. JAXB is available as early release on Sun's site as is the newest JDK. Otherwise, you have to design a factory and interface that will do this for you (which is what JAXB basically is in a very simplified view). -
Java arrays - flexible positioning of subscripting
Hi, I am fairly familiar with Java so was surprised when I came across this line in HashTable.java:
private transient Entry table[];
I can find no reference to this sort of declaration of arrays in the array tutorial on the java.sun.com website. Does this mean that Java supports both this manner of creating arrays:
int [] intArray;
and this manner:
int intArray [];
I have tried both and they both compile using the Java 2 - 1.4.1 interpreter (i.e. using the javac command).
Can anyone explain why Sun would support two different ways of declaring an array or is there a more logical explanation (i.e. that these two "intArray" variables are actually two different types of constructs)?
Thanks,
Novice>
Well ... these are all valid declarations;-[snip]
>
They're all valid and on the whole java is consistent
and logical, sorry if you find it confusing.
[snip]
I think you've misunderstood me. I did not say that Java is not consistent. I was simply trying to find a reason for the two different ways of declaring an array.
I was just looking for a documented reason for supporting both as I'm modifying a Java grammar that supposedly conforms to the standard, but the grammar doesn't allow for this manner of array declaration.
Thanks,
Novice -
Java Threads vs. Native Global Variables
A brief description of the problem:
I am trying to integrate a multi-threaded Java app with legacy Fortran code. The Fortran code in question makes extensive use of global variables in the form of Fortran's Common Block data structure.
If multiple threads were allowed access to a native routine, they would over write each others data which is stored in global variables.
If only one thread at a time can have access to the native routine for the duration of the native routine, the whole advantage of using threads is completely nullified.
These native routines cannot be rewritten (3rd party code) and must be used.
One solution I envisioned was to load a new copy of the native shared object code for each Java object that used the native code. However, it seems System.loadLibrary() can only be used in a static context.
Is there any known solution to this problem?Here is an elaboration on the earlier suggestions. It's a high overhead solution, because you have to start a bunch of JVMs.
1. You have a java control program, which will start up a pool of "services", make requests to them, and gather the results.
2. Each service is a small java program with a native method:
o java communications front-end.
o native method declaration.
o native - in your case fortran - method implementation.
3. Each service is started using "exec". That puts it in a separate process.
4, Since each service is a java program, you can use java to do communications between the control program and the service.
o You could use RMI.
o You could - perhaps - use java Process communications, i.e., have the services write to stdout, and have the control program capture the output.
o You could use socket communications. -
I am using Java threads in my Java program, running on Windows Professional 2000. I am monitoring the threads using Windows Performance Monitor (WPM). However, even running a small Java program which creates only 2 threads, results in many (at least 10) instances of Java threads being reported by the WPM. Problem is, in WPM, there is no way to determine which threads in the WPM are the threads that I programmatically created. Any ideas on how to determine this?
Thanks.
RhodieHi Dmirty ,
To handle large asynchronous message in queues you can use message packaging where multiple message are processed in one package . to make it applicable you have to perform these simple steps
1. go to SXMB_ADM add one RUNTIME parameter PACKAGING and value 1
2 GO TO transaction SXMS_BCONF set delay time 0 message count 100 messages and package size 1000 KB
with these setting your improvement will increase .secondly also put IN SXMB_ADM monitor category parameter QRFC_RESTART_ALLOWED TO 1
this will automatically start your queue . Only thing you have to take care if you enable packaging them don't keep too many parallel queue i.e EO_INBOUND_PARALLEL and EO_OUTBOUND_PARALLEL should be less than 20
Regards,
Saurabh
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