GUI invoked from the event-dispatching thread : Basics « Swing JFC « Java






GUI invoked from the event-dispatching thread

GUI invoked from the event-dispatching thread
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuBar;

/* TopLevelDemo.java requires no other files. */
public class TopLevelDemo {
  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);

    //Create and set up the window.
    JFrame frame = new JFrame("TopLevelDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Create the menu bar. Make it have a cyan background.
    JMenuBar cyanMenuBar = new JMenuBar();
    cyanMenuBar.setOpaque(true);
    cyanMenuBar.setBackground(Color.cyan);
    cyanMenuBar.setPreferredSize(new Dimension(200, 20));

    //Create a yellow label to put in the content pane.
    JLabel yellowLabel = new JLabel();
    yellowLabel.setOpaque(true);
    yellowLabel.setBackground(Color.yellow);
    yellowLabel.setPreferredSize(new Dimension(200, 180));

    //Set the menu bar and add the label to the content pane.
    frame.setJMenuBar(cyanMenuBar);
    frame.getContentPane().add(yellowLabel, BorderLayout.CENTER);

    //Display the window.
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }
}

           
       








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