package com.game;
import java.util.ArrayList;
import java.util.Set;

import com.javapractice.Book;
??? //玩家類 ?
public class Player {

?? ?private int id;
?? ?private String name;
?? ?
?? ?//手牌
?? ?public ArrayList<Squeezer> hands;
?? ?
?? ?public Player(){
?? ??? ?this.hands =? new ArrayList<Squeezer>();
?? ??? ?}
?? ?
?? ?public int getId() {
?? ??? ?return id;
?? ?}
?? ?
?? ?public void setId(int id) {
?? ??? ?this.name = name;
?? ?}
?? ?
?? ?public String getName() {
?? ??? ?return name;
?? ?}

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

package com.game;
//牌類
public class Squeezer {

?? ?private int id;
?? ?private String name;
?? ?
?? ?public Squeezer(int id, String name){
?? ??? ?this.id = id;
?? ??? ?this.name = name;
?? ?}
?? ?
?? ?public int getId() {
?? ??? ?return id;
?? ?}
?? ?public void setId(int id) {
?? ??? ?this.id = id;
?? ?}
?? ?public String getName() {
?? ??? ?return name;
?? ?}
?? ?public void setName(String name) {
?? ??? ?this.name = name;
?? ?}
}

package com.game;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;

import com.javapractice.Book;

public class BeginPlayingGame {
?? ?public static List<Squeezer> squeezers;
?? ?public List<Squeezer> list;
?? ?static Scanner console = new Scanner(System.in);
?? ?Player player1 = new Player();
?? ?Player player2 = new Player();
?? ?
?? ?public BeginPlayingGame(){
?? ??? ?this.squeezers = new ArrayList<Squeezer>();
?? ?}

?? ?//創(chuàng)建撲克牌
?? ?public void squeezerList(){
?? ??? ?System.out.println("========開始創(chuàng)建撲克牌...========");
?? ??? ?Squeezer[] squeezer = {
?? ??? ?new Squeezer(1,"黑桃2"),new Squeezer(2,"紅桃2"),new Squeezer(3,"梅花2"),new Squeezer(4,"方塊2"),
?? ??? ?new Squeezer(5,"黑桃3"),new Squeezer(6,"紅桃3"),new Squeezer(7,"梅花3"),new Squeezer(8,"方塊3"),
?? ??? ?new Squeezer(9,"黑桃4"),new Squeezer(10,"紅桃4"),new Squeezer(11,"梅花4"),new Squeezer(12,"方塊4"),
?? ??? ?new Squeezer(13,"黑桃5"),new Squeezer(14,"紅桃5"),new Squeezer(15,"梅花5"),new Squeezer(16,"方塊5"),
?? ??? ?new Squeezer(17,"黑桃6"),new Squeezer(18,"紅桃6"),new Squeezer(19,"梅花6"),new Squeezer(20,"方塊6"),
?? ??? ?new Squeezer(21,"黑桃7"),new Squeezer(22,"紅桃7"),new Squeezer(23,"梅花7"),new Squeezer(24,"方塊7"),
?? ??? ?new Squeezer(25,"黑桃8"),new Squeezer(26,"紅桃8"),new Squeezer(27,"梅花8"),new Squeezer(28,"方塊8"),
?? ??? ?new Squeezer(29,"黑桃9"),new Squeezer(30,"紅桃9"),new Squeezer(31,"梅花9"),new Squeezer(32,"方塊9"),
?? ??? ?new Squeezer(33,"黑桃10"),new Squeezer(34,"紅桃10"),new Squeezer(35,"梅花10"),new Squeezer(36,"方塊10"),
?? ??? ?new Squeezer(37,"黑桃J"),new Squeezer(38,"紅桃J"),new Squeezer(39,"梅花J"),new Squeezer(40,"方塊J"),
?? ??? ?new Squeezer(41,"黑桃Q"),new Squeezer(42,"紅桃Q"),new Squeezer(43,"梅花Q"),new Squeezer(44,"方塊Q"),
?? ??? ?new Squeezer(45,"黑桃K"),new Squeezer(46,"紅桃K"),new Squeezer(47,"梅花K"),new Squeezer(48,"方塊K"),
?? ??? ?new Squeezer(49,"黑桃A"),new Squeezer(50,"紅桃A"),new Squeezer(51,"梅花A"),new Squeezer(52,"方塊A"),
?? ??? ?};
?? ??? ?squeezers.addAll(0,Arrays.asList(squeezer));
?? ??? ?System.out.println("========成功添加撲克牌========");
?? ??? ?System.out.print("為：[");
?? ??? ?for (Squeezer squeezer2 : squeezer) {
?? ??? ??? ?System.out.print(squeezer2.getName()+" ");
?? ??? ?}
//?? ??? ?String s="??? Hello World????? ".trim();?? "Hello World"
?? ??? ?System.out.print("]");
?? ??? ?System.out.println();
?? ?}
?? ?
?? ?public void deal(){
?? ??? ?System.out.println("---------開始發(fā)牌--------");
?? ??? ?player1.hands.add(squeezers.get(0));
?? ??? ?player1.hands.add(squeezers.get(1));
?? ??? ?player2.hands.add(squeezers.get(2));
?? ??? ?player2.hands.add(squeezers.get(3));
?? ??? ?System.out.println("玩家"+player1.getName()+"的手牌為："+squeezers.get(0).getName()+"和："+squeezers.get(1).getName());
?? ??? ?System.out.println("玩家"+player2.getName()+"的手牌為："+squeezers.get(2).getName()+"和："+squeezers.get(3).getName());
?? ?}
?? ?
?? ?public void shuffle(){
?? ??? ?//打亂撲克牌順序
?? ??? ?Collections.shuffle(squeezers);
?? ?}
?? ?
?? ?//比較大小
?? ?public void fight(){
?? ??? ?int e =0;
?? ??? ?System.out.println("比賽開始。。。");
?? ??? ?int o = compare(player1.hands.get(0),player1.hands.get(1));
?? ??? ?int w = compare(player2.hands.get(0),player2.hands.get(1));
?? ??? ?if(o == 1&&w ==1){
?? ??? ??? ?e = compare(player1.hands.get(0),player2.hands.get(1));
?? ??? ?}else if(o == 1&&w ==-1){
?? ??? ??? ?e = compare(player1.hands.get(0),player2.hands.get(1));
?? ??? ?}else if(o == -1&&w == 1){
?? ??? ??? ?e = compare(player1.hands.get(1),player2.hands.get(0));
?? ??? ?}else if(o == -1&&w ==-1){
?? ??? ??? ?e = compare(player1.hands.get(1),player2.hands.get(1));
?? ??? ?}
?? ??? ?if(e>0)
?? ??? ??? ?System.out.println("玩家"+player1.getName()+"獲勝！");
?? ??? ?else
?? ??? ??? ?System.out.println("玩家"+player2.getName()+"獲勝！");
?? ?}
?? ?
?? ?//創(chuàng)建玩家
?? ?public void createPlayer(){
??????? //獲取輸入是整數(shù)的ID
?? ??? ?while(true){
?? ??? ??? ?try{?? ??? ?
?? ??? ?System.out.println("請輸入第一名玩家的ID：");
?? ??? ?String player1Id = console.next();
?? ??? ?player1.setId(Integer.parseInt(player1Id));
?? ??? ?break;
?? ??? ?}catch(NumberFormatException e){
?? ??? ??? ?e.printStackTrace();
?? ??? ??? ?System.out.println("請輸入整數(shù)的ID：");
?? ??? ?}
?? ?}
?? ??? ?System.out.println("請輸入第一名玩家的姓名：");
?? ??? ?String player1name = console.next();
?? ??? ?player1.setName(player1name);
?? ??? ?while(true){
?? ??? ??? ?try{?? ??? ?
?? ??? ?System.out.println("請輸入第一名玩家的ID：");
?? ??? ?String player2Id = console.next();
?? ??? ?player2.setId(Integer.parseInt(player2Id));
?? ??? ?break;
?? ??? ?}catch(NumberFormatException e){
?? ??? ??? ?e.printStackTrace();
?? ??? ??? ?System.out.println("請輸入整數(shù)的ID：");
?? ??? ?}
?? ?}
?? ??? ?System.out.println("請輸入第二名玩家的姓名：");
?? ??? ?String player2name = console.next();
?? ??? ?player2.setName(player2name);
?? ??? ?System.out.println("========歡迎"+player1.getName()+"和"+player2.getName()+"進入游戲========");
?? ??? ?}
?? ?
?? ?//比較兩張牌的大小
?? ?public int compare(Squeezer e1,Squeezer e2){
?? ??? ?int p1=0;
?? ??? ?int p2=0;
?? ??? ?for(int i=0;i<52;i++){
?? ??? ??? ?if(e1.equals(squeezers.get(i)))
?? ??? ??? ? p1 = squeezers.get(i).getId();
?? ??? ??? ?if(e2.equals(squeezers.get(i)))
?? ??? ??? ? p2 = squeezers.get(i+1).getId();
?? ??? ?}
?? ??? ?if(p1>p2)
?? ??? ???? return 1;
?? ??? ?else
?? ??? ??? ?return -1;
?? ??? ?}
?? ?
?? ?public static void main(String[] args) {
?? ??? ?BeginPlayingGame bpg =new BeginPlayingGame();
?? ??? ?bpg.createPlayer();
?? ??? ?bpg.squeezerList();
?? ??? ?bpg.shuffle();
?? ??? ?bpg.deal();
?? ??? ?bpg.fight();
?? ??? ?}
}

請問一下我的錯誤在哪？？為什么會跳出空指針錯誤？