下载后可任意编辑第一章实验一package ch01;import java.text.SimpleDateFormat;import java.util.Date;class Timer extends Thread { private SimpleDateFormat sdf = new SimpleDateFormat("yyyy 年 MM 月 dd 日 HH:mm:ss"); public void run() { while (true) { System.out.print("\r 现在时间是："); Date now = new Date(); System.out.print(sdf.format(now)); try { sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }}public class Clock { public static void main(String[] args) { Timer timer = new Timer(); timer.start(); }}实验二package ch01;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.util.Random;import javax.swing.JButton;import javax.swing.JFrame;public class MagicButton extends MouseAdapter { JFrame win; JButton button = new JButton("你点不到我"); Random rand = new Random(); void initUI() {下载后可任意编辑 win = new JFrame(); win.setLayout(null); button.setSize(100, 40); button.addMouseListener(this); win.add(button); win.setSize(400, 300); win.setResizable(false); win.setLocationRelativeTo(null); win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); win.setVisible(true); } public static void main(String[] args) { MagicButton demo = new MagicButton(); demo.initUI(); } public void mouseEntered(MouseEvent e) { int mouseX = button.getX() + e.getX(); int mouseY = button.getY() + e.getY(); while (true) { int buttonX = rand.nextInt(win.getWidth() - button.getWidth()); int buttonY = rand.nextInt(win.getHeight() - button.getHeight()); button.setLocation(buttonX, buttonY); if (!button.getBounds().contains(mouseX, mouseY)) { break; } } }}第二章下载后可任意编辑实验一/*********************************2. 交换两个变量的值（不允许使用中间变量）。 **********************************/package ch03;public class Exp2_2 {public static void main(String[] args) {int a = 2, b = 3...
