[RESOLVED] Threading in Java to display numbers.

Hi all,

I want to print some numbers, say starting from 1 and increment by 1, in a specific interval, say each one second.

I want to use Java thread to do this. Can you guys give me a clue.

I've try this, but I can't execute on main(). When I call the init() method, thread stopped.

Code:

---

public class Counter extends Applet implements Runnable {
        Thread t;       
        int Count;

    @Override
        public void init()       
        {       
                Count=0;
                t=new Thread(this);
                t.start();
        }

    @Override
        public boolean mouseDown(Event e,int x, int y)
        {       
                t.stop();
                return true;
        }

        public void run()
        {
                while(true)
                {
                        Count++;
                        repaint();
                        try {
                                Thread.sleep(10);
                        } catch (InterruptedException e) {}
                }
        }

    @Override
        public void paint(Graphics g)
        {
                //g.drawString(Integer.toString(Count),10,10);
                System.out.println("Count= "+Count);
        }

    @Override
        public void stop()
        {
                t.stop();
        }
}

public class Main {
    public static void main(String[] args) {
       
        Counter ss = new Counter();
        ss.run();
    }

}

---

Thanks.

Try this

Code:

---

import java.util.logging.Level;
import java.util.logging.Logger;

public class Util {

    public static void main(String[] args) throws Exception {
        Thread th = new Thread(new Runnable() {

            public void run() {
                int i = 0;
                while (i <= 10) {
                    try {
                        System.out.println(i++);
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
        });
        th.start();
    }
}

---

And you can't use the main method to display an applet, you must have a containing browser. so put it in an HTML page

Oh dear, it's a terrible mistake I have make. Yes you are right, and mess-up on my IDE I think.

Quote:

---

Originally Posted by ComputerJy

Try this

Code:

---

import java.util.logging.Level;
import java.util.logging.Logger;

public class Util {

    public static void main(String[] args) throws Exception {
        Thread th = new Thread(new Runnable() {

            public void run() {
                int i = 0;
                while (i <= 10) {
                    try {
                        System.out.println(i++);
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
        });
        th.start();
    }
}

---

---

Thanks pal.

This code working as I expected. I've implement it on a button click-event and it works fine. But mess up one thing on my GUI.

Until the thread execution completed, all the controls(I mean buttons, check boxes, etc) are freeze. That mean I can't click any button, check-uncheck a check box and so on. Not the whole frame, I can move frame only.

What can be wrong.

After execution of the thread completed, I can use all controls.

Thread.sleep(1000); causes the main thread to suspend all execution for 1000 milliseconds

Yes, initially I guess that do something like this in that thread.

Code:

---

        int x = 1;
        Thread th = new Thread(new Runnable() {

            public void run(){
                int counter = 0;
                while(counter <= 10000){
                        System.out.println(counter++);
                }
            }
        });

---

But it not work. As I said early, until print the number 10000 to console, I can't use any controls on the GUI.

Any idea pal...

Actually something is wrong with the way you're organizing your code. Because a simple test

Code:

---

import java.util.logging.Level;
import java.util.logging.Logger;

public class Util {

    public static void main(String[] args) throws Exception {
        Thread th = new Thread(new Runnable() {

            public void run() {
                int i = 0;
                while (i <= 10) {
                    try {
                        System.out.println(i++);
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(Util.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
        });
        th.start();
        Thread.sleep(500);
        for (char c = 'a'; c <= 'z'; c++) {
            System.out.println(c);
        }
    }

    private Util() {
    }
}

---

proves that if you call Thread.sleep the current thread only will be suspended not the whole system.

Ok, I try what you say. But I got an error on following lines. Actually I cant use the thread th again.

Code:

---

th.start();

---

Error: package th does not exit

Code:

---

Thread.sleep(500);

---

Error: illegal start of type


I used the thread in the button click event as follows.

Code:

---

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        // TODO add your handling code here:
        Util appProcess = new Util();
        appProcess.th.run();       
    }

---

But still the same thing is happened. :o All those things going on two separate classes right now, as you can see I have create instance for the Util class where I have implement my thread.

Ok pal, I have observed one thing here. I simply create a thread in the same class where I create GUI. Here is my thread.

Code:

---

        Thread testTH = new Thread(new Runnable() {

            public void run(){
                int counter = 0;
                while(counter <= 10){
                    try {
                        System.out.println(counter++);
                        Thread.sleep(1000);
                    }
                    catch (InterruptedException ex) {
                        System.out.println(ex);
                    }
                }
            }
  });

---

Then in the click-event I simply call the start() of the thread.

Code:

---

testTH.start();

---

It works fine. So what is wrong with my code.

I don't know
I haven't seen your code!!

Ya :) it's true.