人机猜拳

import java.util.Scanner;public class Person { Scanner input = new Scanner(System.in);  String name; int score; String action; int num;  public void method() { System.out.println("\n请出拳：1.剪刀 2.石头 3.布"); boolean a = true; do { num = input.nextInt(); if (num == 1 || num == 2 || num == 3) { switch (num) { case 1: action = "剪刀"; break; case 2: action = "石头"; break; case 3: action = "布"; break; } a = false; System.out.println("你出拳：" + action); } else { System.out.println("输入数字有误,请重新输入"); } } while (a); } }

第二个类，电脑类：

  public class Computer {  String name; int score; String action; int num;  public void method(){  num=(int)((Math.random())*3)+1; switch(num){ case 1: action="剪刀"; break; case 2: action="石头"; break; case 3: action="布"; break; } System.out.println(name+"出拳："+action); } } 

第三个类，游戏类：

import java.util.Scanner;

public class Game { Scanner input = new Scanner(System.in);  Person person = new Person();//创建玩家类的对象 Computer computer = new Computer();//创建电脑类的对象 int number; int frequency = 0;  public void process() { System.out .println("--------------------------欢迎进入游戏世界--------------------------\n"); System.out.println("\t\t********************************"); System.out.println("\t\t**********猜拳，开始*************"); System.out.println("\t\t********************************"); System.out.println(); System.out.println("出拳规则：1.剪刀 2.石头 3.布"); System.out.print("请选择对方角色（1:刘备2:孙权3:曹操）:"); boolean b = true; do { number = input.nextInt(); if (number == 1 || number == 2 || number == 3) { switch (number) { case 1: computer.name = "刘备"; break; case 2: computer.name = "孙权"; break; case 3: computer.name = "曹操"; break; } b = false; } else { System.out.println("输入数字有误,请重新输入"); } } while (b); System.out.print("请输入你的姓名："); person.name = input.next(); System.out.println(person.name + " VS " + computer.name + " 对战\n"); System.out.println("要开始吗？(y/n)"); char answer = input.next().charAt(0); while (answer == 'y') { person.method(); computer.method(); if (person.num == computer.num) { System.out.println("嘿嘿，和局，等着瞧吧！"); } else if (((person.num == 2) && (computer.num == 1)) || (person.num == 1) && (computer.num == 3) || ((person.num == 3) && (computer.num == 2))) { System.out.println("哇，你赢了，好厉害！"); person.score++; } else { System.out.println("^_^!!!你输了，真笨！"); computer.score++; } frequency++; System.out.println("\n"); System.out.println("还要继续吗？(y/n)"); answer = input.next().charAt(0); } }  public void showResult() { System.out.println("********************************"); System.out.println(person.name + " VS " + computer.name); System.out.println("对战次数：" + frequency); System.out.println("\n姓名\t\t得分"); System.out.println(person.name + "\t\t" + person.score); System.out.println(computer.name + "\t\t" + computer.score); if (person.score < computer.score) { System.out.println("呵呵，笨笨，下次加油！"); } else if (person.score == computer.score) { System.out.println("哇，竟然平局，我们下次一决胜负！"); } else { System.out.println("哇，你好棒啊！"); } System.out.println("********************************"); } }

测试类：

public class Demo {
public static void main(String[] args) { Game play=new Game();//创建游戏类的对象 play.process();//调用游戏类的游戏进程方法 play.showResult();//调用游戏类的结算方法 } }