Source Code : Swing and threads: invoke later

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Swing and threads: invoke later

  

import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class InvokeLaterDemo extends Object {
  private static void print(String msg) {
    String name = Thread.currentThread().getName();
    System.out.println(name + ": " + msg);
  }

  public static void main(String[] args) {
    final JLabel label = new JLabel("--------");

    JPanel panel = new JPanel(new FlowLayout());
    panel.add(label);

    JFrame f = new JFrame();
    f.setContentPane(panel);
    f.setSize(300, 100);
    f.setVisible(true);

    try {
      print("sleeping for 3 seconds");
      Thread.sleep(3000);
    } catch (InterruptedException ix) {
      print("interrupted while sleeping");
    }

    print("creating code block for event thread");
    Runnable setTextRun = new Runnable() {
      public void run() {
        try {
          Thread.sleep(500);
          print("about to do setText()");
          label.setText("New text!");
        } catch (Exception x) {
          x.printStackTrace();
        }
      }
    };

    print("call invokeLater()");
    SwingUtilities.invokeLater(setTextRun);
    print("return from invokeLater()");
  }
}

           
         
    
  

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