关于用Java实现简单人机猜拳的练习

关于用Java实现简单人机猜拳的练习

我用了四个类来实现这个小程序，用到之前学习的一些知识，分别是User，Computer，Game，以及Enter。

1.User

import java.util.Scanner;

public class User {
	private String name = null;

	public String getName() {
		return name;
	}

	private static User user;

	private User() {

	}

	public static User getInstrance() {
		if (user == null) {
			user = new User();
		}
		return user;
	}

	public void setName() {
		Scanner input1 = new Scanner(System.in);
		System.out.print("请输入你的姓名：");
		name = input1.next();

	}

	public int showFist() {
		Scanner input2 = new Scanner(System.in);
		System.out.print("请出拳：1.剪刀  2.石头  3.布（输入对应数字）：");
		int num = input2.nextInt();
		while (true) {
			if (num < 1 || num > 3) {
				System.out.println("出拳错误！请重新出拳。");
				System.out.print("请出拳：1.剪刀  2.石头  3.布（输入对应数字）：");
				num = input2.nextInt();
			} else {
				break;
			}
		}
		if (num == 1) {
			System.out.println("你出拳：剪刀");
		}
		if (num == 2) {
			System.out.println("你出拳：石头");
		}
		if (num == 3) {
			System.out.println("你出拳：布");
		}

		return num;

	}
}

2.Computer

import java.util.Scanner;

public class Computer {
	private String cName = null;

	public String getcName() {
		return cName;
	}

	private static Computer computer;

	private Computer() {

	}

	public static Computer getInstrance() {
		if (computer == null) {
			computer = new Computer();
		}
		return computer;
	}

//取名
	public void setComputer() {
		Scanner input1 = new Scanner(System.in);
		String cName1 = "曹操", cName2 = "刘备", cName3 = "孙权";
		System.out.print("请选择对方角色：1." + cName1 + " 2." + cName2 + " 3." + cName3 + "(输入数字):");

		int choose = input1.nextInt();

		while (true) {
			if (choose < 1 || choose > 3) {
				System.out.print("选择错误！请重新选择：");
				choose = input1.nextInt();
			} else {
				break;
			}
		}
		if (choose == 1) {
			System.out.println("你选择了" + cName1 + "对战");
			cName = cName1;
		}
		if (choose == 2) {
			System.out.println("你选择了" + cName2 + "对战");
			cName = cName2;
		}
		if (choose == 3) {
			System.out.println("你选择了" + cName3 + "对战");
			cName = cName3;
		}

	}

//电脑出拳
	public int showFist() {
		int a = (int) (Math.random() * 3);
		if (a == 0) {
			System.out.println(cName + "出拳：剪刀");

		}
		if (a == 1) {
			System.out.println(cName + "出拳：石头");

		}
		if (a == 2) {
			System.out.println(cName + "出拳：布");
		}
		return a + 1;
	}
}

值得注意的是在一个类中，如果有多个方法使用Scanner输入，并使用多个.closed()去关闭时会报错NoSuchElementException。我之前一直以为方法之间是完全独立的，在这个方法中将Scanner关闭了，另一个方法中重新new出来应该就可以用了。没想到这两个方法的Scanner之间还是会有联系的。

3.Game

import java.util.Scanner;

public class Game {
	private int countuser = 0;//用户赢得局数
	private int countcomputer = 0;//电脑赢得局数
	private int count = 0;//进行的局数
	private static Game game;

	private Game() {

	}

	public static Game getInstrance() {
		if (game == null) {
			game = new Game();
		}
		return game;
	}

//初始化游戏
	public void initial() {
		User user = User.getInstrance();
		Computer computer = Computer.getInstrance();
		System.out.println("---------------欢迎进入游戏世界---------------");
		System.out.println("\t\t***************");
		System.out.println("\t\t**    猜拳开始     **");
		System.out.println("\t\t***************");
		System.out.println("出拳规则：1.剪刀  2.石头  3.布");
		computer.setComputer();
		user.setName();
		System.out.println(user.getName() + "VS" + computer.getcName() + "对战");
		System.out.println();
		System.out.println();

	}

	// 比较玩家电脑出拳
	public void compare(int user, int computer) {
		if (user == computer) {
			System.out.println("结果说：平局！运气不好QAQ");
			System.out.println();
			System.out.println();
			count++;
		} else if ((user == 1 && computer == 2) || (user == 2 && computer == 3) || (user == 3 && computer == 1)) {
			countcomputer++;
			count++;
			System.out.println("结果说：你输了。真笨！");
			System.out.println();
			System.out.println();
		} else {
			countuser++;
			count++;
			System.out.println("结果说：你赢了。真棒！");
			System.out.println();
			System.out.println();
		}

	}

	// 统计
	public void Statistics() {
		User user = User.getInstrance();
		Computer computer = Computer.getInstrance();
		System.out.println(computer.getcName() + "VS" + user.getName());
		System.out.println("对战次数：" + count);
		System.out.println();
		System.out.println();
		System.out.println("姓名\t得分\t");
		System.out.println(user.getName() + "\t" + countuser + "\t");
		System.out.println(computer.getcName() + "\t" + countcomputer + "\t");
	}

	public void startGame() {
		Scanner input1 = new Scanner(System.in);
		System.out.print("要开始比赛吗？(Y/N):");
		char start = input1.next().charAt(0);
		System.out.println();
		System.out.println();
		while (true) {
			if (start != 'Y' && start != 'y' && start != 'N' && start != 'n') {
				System.out.print("输入错误！请重新输入：");
				start = input1.next().charAt(0);
			} else {
				break;
			}
		}

		if (start == 'N' || start == 'n') {
			System.out.println("再见！");

			return;
		}
		if (start == 'Y' || start == 'y') {
			User user = User.getInstrance();
			;
			Computer computer = Computer.getInstrance();
			do {
				int a = user.showFist();
				int b = computer.showFist();
				compare(a, b);
				;
				System.out.print("是否开始下一轮？(Y/N):");
				char continuegame = input1.next().charAt(0);
				while (true) {
					if (continuegame != 'Y' && continuegame != 'y' && continuegame != 'N' && continuegame != 'n') {
						System.out.println("输入错误！请重新输入。");
						continuegame = input1.next().charAt(0);
					} else {
						break;
					}
				}
				if (continuegame == 'N' || continuegame == 'n') {
					System.out.println();
					System.out.println();
					System.out.println();
					break;
				}
			} while (true);
		}

	}

}

4.Enter

public class Enter {
	public static void main(String[] args) {
		Game game = Game.getInstrance();
		game.initial();
		game.startGame();
		game.Statistics();
	}
}

5.效果图