集合的工具类：Collections、斗地主游戏

目录

Collections:是一个用来操作集合的工具类

斗地主游戏

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Collections:是一个用来操作集合的工具类

Collections提供的常用静态方法

Collections只能支持对List集合进行排序

package com.xinbao.d6_parameter;

public class Student implements Comparable{
    private String name;
    private double score;
    private int age;

    @Override
    public int compareTo(Student o) {
        return Double.compare(this.score,o.score);
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", score=" + score +
                ", age=" + age +
                '}';
    }

    public Student() {
    }

    public Student(String name, double score, int age) {
        this.name = name;
        this.score = score;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

}

package com.xinbao.d6_parameter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class CollectionsTest1 {
    public static void main(String[] args) {
        List list = new ArrayList<>();
        Collections.addAll(list,"JUdy","Bob","Cindy","Jilly","DAvid");
        System.out.println(list);//[JUdy, Bob, Cindy, Jilly, DAvid]

        Collections.shuffle(list);//打乱元素
        System.out.println(list);//[JUdy, Cindy, Bob, Jilly, DAvid]

        Collections.sort(list);//排序
        System.out.println(list);//[Bob, Cindy, DAvid, JUdy, Jilly]

        List students = new ArrayList<>();
        Student s1 = new Student("紫霞仙子",99.9,20);
        Student s2 = new Student("至尊宝",99.5,20);
        Student s3 = new Student("牛魔王",99.3,25);
        Student s4 = new Student("月光宝盒",88,888);
        Collections.addAll(students,s1,s2,s3,s4);
        System.out.println(students);

        Collections.sort(students);

//        Collections.sort(students, new Comparator() {
//            @Override
//            public int compare(Student o1, Student o2) {
//                return o1.getAge() - o2.getAge();
//            }
//        });

        Collections.sort(students, ( o1, o2) -> o1.getAge() - o2.getAge());
        System.out.println(students);
    }
}

斗地主游戏

.总共有54张牌
点数："3","4","5","6","7","8","9","10","J"," Q "," K "," A ","2"
花色：♦, ♣,♥,♠
大小王：,
斗地主：发出51张牌，剩下3张做为底牌。

分析实现
在启动游戏房间的时候，应该提前准备好54张牌接着，需要完成洗牌、发牌、对牌排序、看牌

package com.xinbao.d3_collection_test;

public class Card {
    private String number;
    private String color;
    private int size;//大小

    public Card() {
    }

    public Card(String number, String color, int size) {
        this.number = number;
        this.color = color;
        this.size = size;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public int getSize() {
        return size;
    }

    public void setSize(int size) {
        this.size = size;
    }

    @Override
    public String toString() {
        return number + color + "";
    }
}

package com.xinbao.d3_collection_test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Room {
    private List allCards = new ArrayList<>();

    public Room(){
        //1、做出54张牌，存入allCards集合中去
        //点数
        String[] numbers = {"3","4","5","6","7","8","9","10","J","Q","k","A","2"};
        //花色
        String[] colors = {"♠","♥","♦","♣"};
        //遍历点数，再遍历花色，构造Card类，添加大小
        int size = 0;
        for (String number : numbers) {
            size++;
            for (String color : colors) {
                allCards.add(new Card(number,color,size));
            }
        }
        //单独存入大小王
        Card c1 = new Card("","",++size);
        Card c2 = new Card("","",++size);
        Collections.addAll(allCards,c1,c2);
        System.out.println("新牌：" + allCards);
    }

    public void start() {
        //1、洗牌
        Collections.shuffle(allCards);
        System.out.println("洗牌后" + allCards);
        //2、发牌
        List player1 = new ArrayList<>();
        List player2 = new ArrayList<>();
        List player3 = new ArrayList<>();

        for (int i = 0; i < allCards.size()-3; i++) {
            Card c = allCards.get(i);
            if (i % 3 == 0){
                player1.add(c);
            }else if (i % 3 == 1){
                player2.add(c);
            }else if (i % 3 == 2){
                player3.add(c);
            }
        }

        //3、对玩家牌排序

        sortCards(player1);
        sortCards(player2);
        sortCards(player3);

        System.out.println("玩家1：" + player1);
        System.out.println("玩家2：" + player2);
        System.out.println("玩家3：" + player3);

        //4、看牌
        List lastThreeCards = allCards.subList(allCards.size()-3, allCards.size());//,50,51,52
        System.out.println("底牌：" + lastThreeCards);
        player3.addAll(lastThreeCards);
        sortCards(player3);
        System.out.println("玩家3抢到地主" + player3);
    }

    private void sortCards(List cards){
        Collections.sort(cards, new Comparator() {
            @Override
            public int compare(Card o1, Card o2) {
                return o2.getSize() - o1.getSize();//降序
            }
        });
    }
}

package com.xinbao.d3_collection_test;

import java.util.List;

public class Gamedemo {
    public static void main(String[] args) {
        Room room = new Room();
        //游戏启动
        room.start();
    }

}

E:\JVsoft\Java\jdk-17\bin\java.exe -javaagent:E:\JVsoft\IntelliJIDEA2021.1.1\lib\idea_rt.jar=51741:E:\JVsoft\IntelliJIDEA2021.1.1\bin -Dfile.encoding=UTF-8 -classpath E:\JVsoft\code\out\production\collection-map-stream-app com.xinbao.d3_collection_test.Gamedemo
新牌：[3♠, 3♥, 3♦, 3♣, 4♠, 4♥, 4♦, 4♣, 5♠, 5♥, 5♦, 5♣, 6♠, 6♥, 6♦, 6♣, 7♠, 7♥, 7♦, 7♣, 8♠, 8♥, 8♦, 8♣, 9♠, 9♥, 9♦, 9♣, 10♠, 10♥, 10♦, 10♣, J♠, J♥, J♦, J♣, Q♠, Q♥, Q♦, Q♣, k♠, k♥, k♦, k♣, A♠, A♥, A♦, A♣, 2♠, 2♥, 2♦, 2♣, , ]
洗牌后[2♠, Q♥, 8♠, A♦, J♦, Q♠, 7♦, 4♣, k♣, J♣, 2♦, 2♥, 3♥, 10♠, 4♦, 8♥, A♠, 5♠, 8♣, 6♥, 6♣, 9♠, k♦, 3♠, k♠, 5♥, 5♣, 9♥, 3♦, 6♦, 8♦, 2♣, Q♦, 5♦, J♥, 7♥, k♥, Q♣, 7♣, 4♥, 10♥, 10♦, A♥, , 7♠, 3♣, 9♦, A♣, 10♣, , 9♣, 4♠, J♠, 6♠]
玩家1：[2♠, A♦, A♥, k♠, k♥, J♣, 10♣, 9♠, 9♥, 8♥, 8♣, 8♦, 7♦, 5♦, 4♥, 3♥, 3♣]
玩家2：[, , 2♦, 2♣, A♠, k♦, Q♥, Q♣, J♦, J♥, 10♠, 10♥, 9♦, 6♥, 5♥, 4♣, 3♦]
玩家3：[2♥, A♣, k♣, Q♠, Q♦, 10♦, 9♣, 8♠, 7♥, 7♣, 7♠, 6♣, 6♦, 5♠, 5♣, 4♦, 3♠]
底牌：[4♠, J♠, 6♠]
玩家3抢到地主[2♥, A♣, k♣, Q♠, Q♦, J♠, 10♦, 9♣, 8♠, 7♥, 7♣, 7♠, 6♣, 6♦, 6♠, 5♠, 5♣, 4♦, 4♠, 3♠]

Process finished with exit code 0