对于简单扑克牌游戏，实现了对子的比较，为了测试的时候方便，顺便加上了重新玩这个部分；
一共是三个类，扑克牌、玩家、还有游戏。
扑克牌类首先有花色和点数属性，为了比较大小，重写了equals方法和使用了系统自动生成的Hashcode方法，对于不用HashSet的类来说，可以不要。
玩家类有名字 id和手牌三个属性，记住是private，通过系统生成的get和set方法进行获取和修改。

package com.poker;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class Gameplay {
static Boolean restart=true;
Listpokerlist=new ArrayList();
Listplayerlist=new ArrayList();
Listplayer1handpoker=new ArrayList();
Listplayer2handpoker=new ArrayList();
String[]type={"方块","梅花","红桃","黑桃"};
String[]point={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};

public void creatPoker(){
System.out.println("开始创建扑克牌");
for(int i=0;i for(int j=0;j pokerlist.add(new Poker(type[i],point[j]));
}

    }
System.out.println("扑克牌创建成功");

}

public void testCreatPoker(){
for(Poker pk:pokerlist){
System.out.println("有如下牌："+pk.getType()+pk.getNum()+" ");}
}

public void creatPlayer(){
for(int n=0;n System.out.println("请输入玩家ID");
String playerID=new Scanner(System.in).next();
System.out.println("请输入玩家姓名");
String playerName=new Scanner(System.in).next();
playerlist.add(new Player(playerID,playerName));
}
System.out.println("玩家添加成功！"+"现有玩家是：");
for(Player player:playerlist){
System.out.println(player.getID()+":"+player.getName());
}

}

public void shufflepoker(){
System.out.println("开始洗牌咯~~"+" .....");
Collections.shuffle(pokerlist);
System.out.println("洗牌完成！");
}

public void deliverPoker(){
System.out.println("开始发牌！");
for(int i=0;i Poker newpoker=pokerlist.get(i);
if(i%2==0){
player1handpoker.add(newpoker);
System.out.println("玩家1抓了一张牌");
}else
{
player2handpoker.add(newpoker);
System.out.println("玩家2抓了一张牌");

}

}

for(Poker Poker1:player1handpoker){
System.out.println(playerlist.get(0).getName()+"手里的牌是"
+Poker1.getType()+Poker1.getNum());
}
for(Poker Poker2:player2handpoker){
System.out.println(playerlist.get(1).getName()+"手里的牌是"
+Poker2.getType()+Poker2.getNum());
}

}

public void comparenum(){
Poker pk11=player1handpoker.get(0);
Poker pk12=player1handpoker.get(1);
Poker pk21=player2handpoker.get(0);
Poker pk22=player2handpoker.get(1);
int level1=0;
int level2=0;
if(pk11.getNum()==pk12.getNum())level1++;
if(pk21.getNum()==pk22.getNum()) level2++;
if(level1>level2){
System.out.println(playerlist.get(0).getName()+"手里的牌是对子,所以"+playerlist.get(0).getName()+"获胜！");
}
else if(level1 System.out.println(playerlist.get(1).getName()+"手里的牌是对子,所以"+playerlist.get(1).getName()+"获胜！");
}
else{
System.out.println("两个人的牌型是一样的，所以比较点数！");
//获得玩家1手中最大的牌
Collections.sort(player1handpoker);
Poker pk1Max=player1handpoker.get(player1handpoker.size()-1);
System.out.println(playerlist.get(0).getName()+"手里最大的牌是："+pk1Max.getType()+pk1Max.getNum());

//获得玩家2手中最大的牌
Collections.sort(player2handpoker);
Poker pk2Max=player2handpoker.get(player2handpoker.size()-1);
System.out.println(playerlist.get(1).getName()+"手里最大的牌是："+pk2Max.getType()+pk2Max.getNum());

if(pk1Max.compareTo(pk2Max)>0){
    System.out.println(playerlist.get(0).getName()+"获胜！");
}else{
    System.out.println(playerlist.get(1).getName()+"获胜！");
}

}

}

public void restart(){
int door=0; //保证输入没问题的时候才开门
do{
System.out.println("是否重新开始游戏?Y/N");
Scanner sc=new Scanner(System.in);
String regame=sc.next();
if(regame.equals("N")||regame.equals("n")){
restart=false;
System.out.println("欢迎下次再玩！");
door=1;
}else if(regame.equals("Y")||regame.equals("y")){
door=1;
}else{
System.out.println("您的输入有误，请重新输入！");
}}while(door==0);

}

public static void main(String [] args){

do{
Gameplay t1=new Gameplay();
t1.creatPlayer();
t1.creatPoker();
t1.testCreatPoker();
t1.shufflepoker();
t1.deliverPoker();
t1.comparenum();
t1.restart();
}while(restart==true);

}

}

package com.poker;

public class Poker implements Comparable {
private String type;
private String num;
public Poker(String type ,String num){

this.setType(type);
this.setNum(num);
}

public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime result + ((num == null) ? 0 : num.hashCode());
result = prime result + ((type == null) ? 0 : type.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Poker other = (Poker) obj;
if (num == null) {
if (other.num != null)
return false;
} else if (!num.equals(other.num))
return false;
if (type == null) {
if (other.type != null)
return false;
} else if (!type.equals(other.type))
return false;
return true;
}
@Override
public int compareTo(Poker o) {
String pokernum="2,3,4,5,6,7,8,9,10,J,Q,K,A";
String pokertype="方块，梅花，红桃，黑桃";
int result;
result=pokernum.indexOf(this.getNum())-pokernum.indexOf(o.getNum());
if(result==0){
result=pokertype.indexOf(this.getType())-pokertype.indexOf(o.getType());
}
return result;
}

}

package com.poker;

public class Player {
private String ID;
private String name;
public Poker handpoker;
public Player(String ID,String name){
this.ID=ID;
this.name=name;

}
public String getID() {
    return ID;
}
public void setID(String iD) {
    ID = iD;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}

}