麻烦仔细阅读下面的程序代码，请将划线上①～④的语句补充完整

Question

import java.awt.*;import java.awt.event.*;public class MyFrameCanExit extends Frame implements ① {public MyFrameCanExit(String str){super(str);}public void windowClosing( ② e) {System.exit(0);}public void windowClosed(WindowEvent e) { }public void windowOpened(WindowEvent e) { }public void windowIconified(WindowEvent e) { }public void windowDeiconified(WindowEvent e) { }public void windowActivated(WindowEvent e) { }public void windowDeactivated(WindowEvent e) { }public static void main(String args[ ]){MyFrameCanExit fr = new MyFrameCanExit("Hello !");fr. ③ (fr); //注册窗口事件监听器。fr. ④ (200,200);fr.setVisible(true);}1. 阅读下面的程序MyAdd.java，填写划线部分的语句或注释，并写出程序执行结果。public class MyAdd { //继承线程类static int total = 10;int n;public MyAdd(int n){this.n=n;}public void run() {try{sleep(n); //含义是：total=total+n;System.out.println(total);}catch(Exception e){System.out.println(“EXCEPTION!”);}}public static void main(String[] args) {MyAdd t1 = new MyAdd(3000);; //启动线程t1}}

Answer 1

1：JFrame
2：WindowEvent
3：addWindowListener
4：setSize
这个不经常用，应该是这样写的吧。
希望能帮到你