import java.util.Scanner;/** * switch实现石头/剪子/布并判断胜负 */public class flowSwitch {    public static void main(String[] args) {        System.out.println("please choice:");        System.out.println(" 1: Rock");        System.out.println(" 2: Scissors");        System.out.println(" 3: Paper");        // 用户输入:        Scanner sc = new Scanner(System.in);        int choice = sc.nextInt();        if (choice > 3 || choice < 1){            System.out.println("input error~! Please again");            choice = sc.nextInt();        }        // 计算机随机数 1, 2, 3:        int random = (int) (1 + Math.random() * 3);        System.out.println("random:" + random);        switch (choice) {            case 1 :                if (random == 1){                    System.out.println("Draw");                    System.out.println("computer is Rock");                }else if (random == 2){                    System.out.println("Player win");                    System.out.println("computer is Scissors");                }else if (random == 3){                    System.out.println("Player loser");                    System.out.println("computer is Paper");                }                break;            case 2 :                if (random == 1){                    System.out.println("Player loser");                    System.out.println("computer is Rock");                }else if (random == 2){                    System.out.println("Draw");                    System.out.println("computer is Scissors");                }else if (random == 3){                    System.out.println("Player win");                    System.out.println("computer is Paper");                }                break;            case 3 :                if (random == 1){                    System.out.println("Player win");                    System.out.println("computer is Rock");                }else if (random == 2){                    System.out.println("Player loser");                    System.out.println("computer is Scissors");                }else if (random == 3){                    System.out.println("Draw");                    System.out.println("computer is Paper");                }                break;        }    }}