JavaSE 内部类（InnerClass）实现

{相关信息}
内部类(Inner Class)是被定义在一个类内部的类，内部类的特点如下：
1）内部类的对象具有外部类变量和方法的访问权限，包括私有成员
2）实现事件监听器的功能时，采用内部类、匿名类实现相当容易
所以，内部类在 AWT 的事件处理机制中应用比较广泛

{内部类使用实例}

package sup.orange.learn;

import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.print.Printable;

/**
 * Created by re-x on 11/2/14.
 */
public class ListenerInnerClass {

    private Frame f;
    private TextField tf;

    public ListenerInnerClass() {
        f = new Frame("click, move mouse");
        tf = new TextField(30);
    }

    public static void main(String[] args) {
        ListenerInnerClass li = new ListenerInnerClass();
        li.show();
    }

    public void show() {
        f.add("North", tf);
        f.addMouseMotionListener(new MyMouseMotionListener());
        f.setSize(300, 240);
        f.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                f.setVisible(false);
                f.dispose();
                System.out.println("quit");
                System.exit(0);
            }
        });

        f.setVisible(true);
    }

    class MyMouseMotionListener extends MouseMotionAdapter {
        public void mouseMoved(MouseEvent e) {
            tf.setText("x= "+e.getX()+", y= "+e.getY());
        }
    }
}