CODEWITHSUNDEEP
javamultithreadingswingjframejpanel
Super-ilad
Super-ilad

Reputation: 101

How to update my JPanel in a simple multithread condition?

There are 3 threads , every thread will add a JButton to JPanel , and the final 3 window should have 3 Jbuttons respectively , but 1 jbutton and 2,3 respectively , i try to use wait() and notifyAll() method to update JPanel to 3 Jbuttons , but failed

(BTW,i am new to this , the problem originated from a complex Server_Client contact list matter ,i simplify it a lot like below codes)

JFrame example shot

import javax.swing.*;

class TestPanel implements Runnable {
//    the common Jpanel of 3 thread
static JPanel SharedPanel = new JPanel();

//    the common JFrame of 3 thread
static JFrame SharedFrame = new JFrame();


//    the JFrame window x,y position
static int Position = 200;

JButton Button1;
String ButtonName;


public TestPanel(String name) {

//        pass a name to JButton
    this.ButtonName = name;


}

public static void main(String[] args) throws InterruptedException {

//      initializing a "A" named JButton to the common Jpanel
    new Thread(new TestPanel("A")).start();


//      initializing a "B" named JButton to the common Jpanel

    new Thread(new TestPanel("B")).start();

//      initializing a "C" named JButton to the common Jpanel

    new Thread(new TestPanel("C")).start();

}


@Override
public void run() {
//      initializing jbutton 
    Button1 = new JButton(ButtonName);

//        add Jbutton to the static common jpanel
    SharedPanel.add(Button1);

//create a new JFrame ,cause 3 window need 3 different jframe (with the same content)
    JFrame jf = new JFrame();

 //      add that common shared japnel the Jframe
    jf.add(SharedPanel);

//        default initializing of window
    jf.setSize(500, 500);

//        to prevent overlap window , offset a little bit for better observation
    jf.setLocation(Position += 50, Position += 50);
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jf.setVisible(true);


}


}

How to refresh each window after a new Jbutton was add to jpanel?

(i also try to assign a while function in the end of Run(),but i discover it is useless, maybe my question is easy for you , thanks for your good help !)

Upvotes: 1

Views: 470

Answers (1)

Itzhak Eretz Kdosha
Itzhak Eretz Kdosha

Reputation: 543

calling:

revalidate();

and then

repaint();

on your shared JPanel will refresh it.

If you wish to refresh all frames you can call those methods on the frames with "notifyAll".

Upvotes: 1

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