mybutton.java

来自「java课程的资料以及实验的代码」· Java 代码 · 共 53 行

import java.awt.*;
import java.awt.Frame;
import java.awt.HeadlessException;
import java.awt.event.*;

 class MyButtonPanel extends Panel{
  public MyButtonPanel() {
    Button bButton = new Button( "蓝色" );
    Button gButton = new Button( "绿色" );
    Button eButton = new Button( "退出" );
    add( bButton );
    add( gButton );
    add( eButton );

    MyActionListener bAction = new MyActionListener( Color.blue );
    MyActionListener gAction = new MyActionListener( Color.green );
    MyActionListener eAction = new MyActionListener( Color.red );

    bButton.addActionListener(bAction);
    gButton.addActionListener(gAction);
    eButton.addActionListener(eAction);
  }
  private class MyActionListener implements ActionListener {
    private Color bgColor;
    public MyActionListener( Color c ){
      this.bgColor = c;
    }

    public void actionPerformed( ActionEvent event ){
        setBackground( bgColor );
        repaint();
        if( event.getActionCommand() == "退出" )
          System.exit(0);
    }
  }
}
 class MyButtonFrame extends Frame {
  public MyButtonFrame() throws HeadlessException {
    setTitle( "测试按钮事件" );
    setSize( 300,200 );
    MyButtonPanel panel = new MyButtonPanel();
    add(panel);
  }

}

public class MyButton {
    public static void main( String[] args ){
      MyButtonFrame frm = new MyButtonFrame();
      frm.show();
    }
}