新手求大神解，这两者的不同，和优劣。虚心求教！！

import java.util.Scanner;
/**
 * @author zhuangqing
 */
public class Test {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] msg = {"剪刀","石头", "布"};
        System.out.println("-----猜拳游戏-----");
        System.out.println("请出拳（1剪刀，2石头，3布）");
        int person = in.nextInt();
        int computer = (int)(Math.random()*3) + 1;
        String result = "电脑出的是：" + msg[computer-1] + "，你出的是：" + msg[person - 1];
        if (person == computer) {
            System.out.println("平局，" + result);
        } else if (person == 1&&computer==2||person==2&&computer==3||person==3&&computer==1) {
            System.out.println("你输了，" + result);
        } else {
            System.out.println("你赢了，" + result);
        }
    }
}

import java.util.Scanner;

/**
 * @author zhuangqing
 */
public class Test2 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] msg = {"剪刀","石头", "布"};
        System.out.println("-----猜拳游戏-----");
        System.out.println("请出拳（1剪刀，2石头，3布）");
        int person = in.nextInt();
        int computer = (int)(Math.random()*3) + 1;
        String result = "电脑出的是：" + msg[computer-1] + "，你出的是：" + msg[person - 1];
        int naturalEnemy = (person+1)%3; //天敌
        if (naturalEnemy == computer) {
            System.out.println("你输了，" + result);
        } else if (person == computer) {
            System.out.println("平局，" + result);
        } else {
            System.out.println("你赢了，" + result);
        }
    }
}

import java.util.Scanner;
/**
 * @author zhuangqing
 */
public class Test3 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        GuessingResult[] results = {GuessingResult.SCISSOR, GuessingResult.ROCK, GuessingResult.PAPER};
        System.out.println("-----猜拳游戏-----");
        System.out.println("请出拳（1剪刀，2石头，3布）");
        int person = in.nextInt();
        int computer = (int)(Math.random()*3) + 1;
        GuessingResult personResult = results[person - 1];
        GuessingResult computerResult = results[computer-1];
        String result = "电脑出的是：" + computerResult.getDesc() + "，你出的是：" + personResult.getDesc();

        if (personResult.naturalEnemy() == computerResult) {
            System.out.println("你输了，" + result);
        } else if (personResult.defeatedByMe() == computerResult) {
            System.out.println("你赢了，" + result);
        } else {
            System.out.println("平局，" + result);
        }
    }
}

/**
 * 猜拳结果枚举类
 */
enum GuessingResult {
    SCISSOR("剪刀"){
        public GuessingResult  naturalEnemy() {
            return ROCK;
        }
        public GuessingResult defeatedByMe() {
            return PAPER;
        }
    },
    ROCK("石头"){
        public GuessingResult  naturalEnemy() {
            return PAPER;
        }
        public GuessingResult defeatedByMe() {
            return SCISSOR;
        }
    },
    PAPER("布"){
        public GuessingResult  naturalEnemy() {
            return SCISSOR;
        }
        public GuessingResult defeatedByMe() {
            return ROCK;
        }
    },
    ;
    private String desc;
    GuessingResult(String desc) {
        this.desc = desc;
    }

    public String getDesc() {
        return desc;
    }

    /**
     * 天敌
     * @return
     */
    public abstract GuessingResult  naturalEnemy();

    /**
     * 能击败的对象
     * @return
     */
    public abstract GuessingResult defeatedByMe();
}