大象工程（石头剪刀布PK游戏）

因为采用了随机数，因此每次编译结果都不同，结果我就不附图了。

public class Elephant {
    /*
     * 大象工程
     * 1.打开冰箱门
     * 2.大象PK
     * 3.把赢的大象放进冰箱
     * 4.关闭冰箱门
     * */

    public static void main(String[] args) {
        System.out.println("大象工程启动：");
        //准备两头大象，一台冰箱
        String elephantA = "大象A";
        String elephantB = "大象B";

        //打开冰箱门
        System.out.println("    1.打开冰箱门");

        //大象pk
        //石头剪刀布，石头1>剪刀2>布3>石头1，用数字代替字符
        //采用Math函数的Math.random()产生3之内的随机数,(int)(Math.random()*3+1)
        System.out.println("    2.大象pk");
        //采用do.while循环，当出现平局时能够继续pk
        String winElephant = null;
        int i = 0;
        do {
            i++;
            int elephantNumA = (int) (Math.random() * 3 + 1);
            int elephantNumB = (int) (Math.random() * 3 + 1);

            //pk开始
            //采用switch将数字和字符对应起来
            String elephantNameA = null;
            String elephantNameB = null;

            switch (elephantNumA) {
                case 1:
                    elephantNameA = "石头";
                    break;

                case 2:
                    elephantNameA = "剪刀";
                    break;

                case 3:
                    elephantNameA = "布";
                    break;

                default:
                    System.out.println("错误！");
                    break;
            }

            switch (elephantNumB) {
                case 1:
                    elephantNameB = "石头";
                    break;

                case 2:
                    elephantNameB = "剪刀";
                    break;

                case 3:
                    elephantNameB = "布";
                    break;

                default:
                    System.out.println("错误！");
                    break;
            }

            System.out.println("        "+"第"+i+"场"+"   "+elephantA+"-"+elephantNameA+" PK "+elephantB+"-"+elephantNameB);

            //三种状况：A赢，B赢，平局
            if (elephantNumA == 1 & elephantNumB == 2 || elephantNumA == 2 & elephantNumB == 3 || elephantNumA == 3 & elephantNumB == 1) {
                System.out.println("            "+elephantA + "赢了");
                winElephant = elephantA;
            } else if (elephantNumA == elephantNumB) {
                System.out.println("            "+"平局");
            } else {
                System.out.println("            "+elephantB + "赢了");
                winElephant = elephantB;
            }
        } while (winElephant == null);

        //胜利的进入冰箱
        System.out.println("    3.把"+winElephant+"放进冰箱");

        //关闭冰箱门，结束
        System.out.println("    4.关闭冰箱门");
        System.out.println("大象工程结束！");
    }
}