threelisteninner.java

来自「java的书上例子」· Java 代码 · 共 67 行

import java.awt.*;
import java.awt.event.*;

/** 一个应用程序，用来演示内部类的使用 */

/** 类ThreeListenInner，定义了三个内部类，分别用来处理鼠标移动事件、
  * 鼠标点击事件和窗口事件 */
public class ThreeListenInner{
	private Frame f;
	private TextField tf;	

	/** main()方法 */
	public static void main(String args[]){
		ThreeListenInner th=new ThreeListenInner();
		th.go();
	}

	/** 方法go() */
	public void go(){
		f=new Frame("Three listeners example");
		f.add("North",new Label("Click and drag the mouse"));
		tf=new TextField(30);
		f.add("South",tf);
		f.addMouseMotionListener(new MouseMotionHandler());
		f.addMouseListener(new MouseEventHandler());
		f.addWindowListener(new WindowEventHandler());
		f.setSize(300,300);
		f.setBackground(Color.blue);
		f.setVisible(true);
	}

	/** 内部类MouseMotionHandler，用来处理鼠标移动事件 */
	public class MouseMotionHandler extends MouseMotionAdapter{

		/** mouseDragged()方法 */
		public void mouseDragged(MouseEvent e){
			String s="Mouse dragging:X = "+e.getX()+"Y = "+e.getY();
			tf.setText(s);
		}
	}//内部类MouseMotionHandler结束

	/** 内部类MouseEventHandler，用来处理鼠标事件 */	
	public class MouseEventHandler extends MouseAdapter{

		/** mouseEntered()方法 */
	    public void mouseEntered(MouseEvent e){
		    String s="The mouse entered";
			tf.setText(s);
	    }

		/** mouseExited()方法 */
		public void mouseExited(MouseEvent e){
		    String s="The mouse has left the building";
			tf.setText(s);
		}
	}//内部类MouseEventHandler结束

	/** 内部类WindowEventHandler，用来处理窗口事件 */
	public class WindowEventHandler extends WindowAdapter{

		/** windowClosing()方法 */
		public void windowClosing(WindowEvent e){
			System.exit(1);
		}
	}//内部类WindowEventHandler结束	
}//类ThreeListenInner结束