[問答題] 下面程序中，在主窗口單擊鼠標(biāo)后，就會(huì)生成一個(gè)新窗口。

import java.awt.*;

import java.awt.event.*;

public class java3 extends Frame

java3()

super("java3");

addNotify();

addWindowListener(new WindowAdapter()

public void windowClosing(WindowEvent e)

System.exit(0);

);

Insets insets=getInsets();

setSize(insets.left+insets.right+150,

insets.top+insets.bottom+150);

this.addMouseListener(MouseEventHandler());

class MouseEventHandler implements MouseAdapter

public void mousePresse(MouseEvent evt)

Rectangle bounds=getBounds();

int x=evt.getX()+bounds.x;

int y=evt.getY()+bounds.y;

java3 m=newjava3();

m.setLocation(x,y);

m.show();

static public void main(Strin

第1處：this.addMouseListener(new MouseEventHandler()) 第2處：class MouseEventHandler extends MouseAdapter 第3處：public void mousePressed(MouseEvent evt)

第1處參數(shù)應(yīng)為實(shí)例化對(duì)象；第2處繼承父類應(yīng)使用extends，implements實(shí)現(xiàn)的是接口；第3處單擊鼠標(biāo)后事件應(yīng)為mousePressed。