我正在Java 2类中创建战争游戏，但是每次运行代码时，我总是收到链表错误，并且找不到解决方案。
我尝试删除pop()函数并添加removeFirst()方法，但是都返回错误。
package ca.sheridancollege.project;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
/**
* @author Rich Smith at ZenOfProgramming.com
*/
public class StartTheWar
{
public static void main (String[] args)
{
System.out.println("Let the War begin!!!\n\nWe will now deal the cards. Best of luck to both players\n ");
List<Card> cardDeck = new ArrayList<>();
for (int x = 0; x < 4; x++) { //for loop using the 4 suits
for (int y = 2; y < 15; y++) { // for loop for 13 for cards 2-10 and faced cards1
cardDeck.add(new Card(x, y)); //create new card then use add method to combine to array list
} //end cards for loop
}//end suit for
Collections.shuffle(cardDeck, new Random()); //deck shuffler
//using our newly learnt knowledge on Linked lists to create 2 - one for each player. player 1/player2
LinkedList<Card> deck1 = new LinkedList<>();
LinkedList<Card> deck2 = new LinkedList<>();
//found interesting Java operation called List which can be broken down into sublists to store information. Just add the total # of cards needed in each sublist
deck1.addAll(cardDeck.subList(0, 26)); //26 cards for p1
deck2.addAll(cardDeck.subList(26, cardDeck.size()));//26 cards for p2
//Array for player objects to be held
ArrayList<Player> p3 = new ArrayList<>();
Player p1 = new Player(deck1);
Player p2 = new Player(deck2);
p3.add(p1);
p3.add(p2);
War game = new War(p3);
game.play();
}
}
/**
* SYST 17796 Project Winter 2019 Base code.
* Students can modify and extend to implement their game.
* Add your name as a modifier and the date!
*/
package ca.sheridancollege.project;
public class Card
{
private int rank; //initialize the rank (2,3,4...King, Ace)
private int suit; //initialize the suit (spades, hearts...)
public Card (int suit, int rank)
{
this.rank = rank;
this.suit = suit;
}//end construcor
//getter method
public int getCard ()
{
return rank;
}//end getCard
//setter method
public void setCard (int rank)
{
this.rank = rank;
}//end setCard
@Override
public String toString ()
{
//combine rank and suit together into a single string(ex: Ace of Diamonds)
//suing StringBuilder for modifiability later on
StringBuilder displayCard = new StringBuilder();
//personal choice to use switch
switch (rank) {
//since rank is int type, now match int 11 to String jack...14 to Ace
case 11:
displayCard.append("Jack");
break;
case 12:
displayCard.append("Queen");
break;
case 13:
displayCard.append("King");
break;
case 14:
displayCard.append("Ace");
break;
default:
displayCard.append(rank); //number from 2 to 10 does not need to modify
break;
}//end rank switch
displayCard.append(" of "); //setting the format of the output
switch (suit) {
case 0:
displayCard.append("Spades");
break;
case 1:
displayCard.append("Hearts");
break;
case 2:
displayCard.append("Clubs");
break;
case 3:
displayCard.append("Diamonds");
break;
default: //anything else, do nothing
break;
}//end suit switch
//return the result of an entire cmombined string
return displayCard.toString();
}//end toString
}
package ca.sheridancollege.project;
/**
* @author Rich Smith at ZenOfProgramming.com
*/
import java.util.ArrayList;
import java.util.List;
public class War extends Game
{
public War (ArrayList<Player> players)
{
super(players);
}
public void play ()
{
while (true) {
//use pop to remove card from top of Linked List- thank god for Rich teaching us all this lol
//this is where error is
Card p1Card = this.getPlayers().get(0).getDeck().pop(); //each player place one card face up
Card p2Card = this.getPlayers().get(1).getDeck().pop();
//display the face up card
System.out.println("Player 1 plays: " + p1Card.toString());
System.out.println("Player 2 plays: " + p2Card.toString());
//rank comparation between two cards
//
if (p1Card.getCard() > p2Card.getCard()) {//if player 1 win
this.getPlayers().get(0).getDeck().pop(); //higher rank wins both cards and
this.getPlayers().get(0).getDeck().pop(); //places them at the bottom of his deck.
System.out.println("Player 1 wins the round and Player 2's cards: " + p2Card.toString());
System.out.println();
}//end if
else if (p1Card.getCard() < p2Card.getCard()) {//if player 2 win
this.getPlayers().get(1).getDeck().pop();
this.getPlayers().get(1).getDeck().pop();
System.out.println("Player 2 wins the round and Player 1's card : " + p1Card.toString());
System.out.println();
}//end else if
// test
else { //war happens while both players draw the same car
System.out.println("War!! Each player places 3 cards face down and flips the 4th! Winner take all!\n");
//creating new temp array for tie
List<Card> war1 = new ArrayList<>();
List<Card> war2 = new ArrayList<>();
//checking do players have enough (4)cards to play war / if not game is over
for (int x = 0; x < 4; x++) {
//either one player runs out of card is game over
if (this.getPlayers().get(0).getDeck().isEmpty() || getPlayers().get(1).getDeck().isEmpty()) {
break;
}//end if
System.out.println("War card for Player 1 is xx\nWar card for Player 2 is xx\n");
war1.add(this.getPlayers().get(0).getDeck().pop()); //place additional card for war
war2.add(this.getPlayers().get(1).getDeck().pop());
}//end for
//only compare result when both players have enough cards for war
if (war1.size() == 4 && war2.size() == 4) {
//display the war cards from each player
System.out.println("War card for Player 1 is " + war1.get(3).toString());
System.out.println("War card for Player 2 is " + war2.get(3).toString());
System.out.println();
//if player 1 wins the war round
if (war1.get(3).getCard() > war2.get(3).getCard()) {
this.getPlayers().get(0).getDeck().addAll(war1); //player1 get all 10 cards
this.getPlayers().get(0).getDeck().addAll(war2);
System.out.println("Player 1 wins the battle! But as they say, winning the battle does not guarantee winning the War!\n");
}//end if
//otherwise player 2 wins the war round
else {
getPlayers().get(1).getDeck().addAll(war1); //player2 get all 10 cards
getPlayers().get(1).getDeck().addAll(war2);
System.out.println("Player 2 wins the battle! But as they say, winning the battle does not guarantee winning the War!\n");
}//end else
}//end if
}//end war round else
}
}
}
/**
* SYST 17796 Project Winter 2019 Base code.
* Students can modify and extend to implement their game.
* Add your name as a modifier and the date!
*/
package ca.sheridancollege.project;
import java.util.LinkedList;
public class Player
{
private LinkedList<Card> deck;
public Player (LinkedList<Card> deck)
{
this.deck = deck;
}
public LinkedList<Card> getDeck ()
{
return this.deck;
}
}
错误：
线程“ main”中的异常java.util.NoSuchElementException
在java.util.LinkedList.removeFirst（LinkedList.java:270）
在java.util.LinkedList.pop（LinkedList.java:801）
在ca.sheridancollege.project.War.play（War.java:23）
在ca.sheridancollege.project.StartTheWar.main（StartTheWar.java:43）