helloworld.java

《J2EE专业项目实例开发》源代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class HelloWorld extends JFrame {
   public HelloWorld( String titleText ) {
      super( titleText );
      addWindowListener( new WindowAdapter() {
            public void
            windowClosing( WindowEvent e ) {
                   HelloWorld.this.dispose();
                   System.exit( 0 );
            }
      });
      JLabel greeting = new JLabel( "Hello World!", JLabel.CENTER );
      getContentPane().add( greeting, BorderLayout.CENTER );
      setSize( 300, 100 );
      setVisible( true );
   }
   public static void main( String[] args ) {
      new HelloWorld( "Hello World! Sample" );
   }
}