3.17 关键词：剪刀石头布；随机数
1 import java.util.Scanner; 2 public class JSB { 3 public static void main(String[] args) { 4 int a = (int)(Math.random() * 3); 5 Scanner input = new Scanner(System.in); 6 System.out.println("输入0（剪刀）/1（石头）/2（布）："); 7 int x = input.nextInt(); 8 9 if (x != 0 && x != 1 && x != 2) 10 System.out.println("请输入0/1/2！"); 11 else { 12 if (a == 0 && x == 2) 13 System.out.println("电脑是剪刀，你是布，电脑赢！"); 14 if (a == 1 && x == 0) 15 System.out.println("电脑是石头，你是剪刀，电脑赢！"); 16 if (a == 2 && x == 1) 17 System.out.println("电脑是布，你是石头，电脑赢！"); 18 if (a == 0 && x == 1) 19 System.out.println("电脑是剪刀，你是石头，你赢！"); 20 if (a == 1 && x == 2) 21 System.out.println("电脑是石头，你是布，你赢！"); 22 if (a == 2 && x == 0) 23 System.out.println("电脑是布，你是剪刀，你赢！"); 24 if (a == x) 25 System.out.println("平手！"); 26 System.out.println("电脑是：" + a); 27 } 28 input.close(); 29 } 30 31 }