GuessGame

/*
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 * and open the template in the editor.
 */
package guess;

import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author partoo
 */
public class Guess {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        int n = 3; //定义生成随机数范围
        Random random = new Random(); 
        int indexNum = random.nextInt(n);      //获取范围内的随机整数
      
        String[] guessOption={"剪刀","石头","布"}; 
        Scanner input=new Scanner(System.in); 
        int usrInput;//创建用户输入变量
        String msg;//创建结果显示变量
        msg = "";//初始化

        while(true) {
            try {
                System.out.print("您要出的是？（0代表剪刀，1代表石头，2代表布）");
                usrInput = input.nextInt();
                
                if(usrInput >= 0 && usrInput <= 2) {
                    break;
                }
                System.out.println("** 您只能输入0～2之间的数字 **");
            } catch (Exception e) {
                System.out.println("** 格式错误！请输入数字 **");
                input.next();
            }            
            
        }  //限定用户输入
        
        switch (indexNum) {
            case 0:
                if (usrInput==0) {
                   msg = "平局"; 
                }else if (usrInput==1) {
                    msg = "您赢了！";
                }else if (usrInput==2) {
                    msg = "您输了！";
                }                
                break;
            case 1:
                if (usrInput==0) {
                   msg = "您输了！"; 
                }else if (usrInput==1) {
                    msg = "平局！";
                }else if (usrInput==2) {
                    msg = "您赢了！";
                }       
                break;
            case 2:
                if (usrInput==0) {
                   msg = "您赢了！"; 
                }else if (usrInput==1) {
                    msg = "您输了！";
                }else if (usrInput==2) {
                    msg = "平局！";
                }  
                break;
        }
        
        System.out.println("电脑出的是："+guessOption[indexNum]+",您输入的是：" + guessOption[usrInput]+","+msg);        
    }
}