消气返回相同的卡为对象

Question

我有这样的输出：

IN方法 - >套装：心等级：四

楼：心 - 四

IN方法 - >套装：钻石等级：ACE

住宅：钻石 - ACE（应该是心脏四）玩家：钻石 - ACE

我为wPlayer house设置最后一张卡后也发生了变化，但是在我的代码中看不到任何内容显示它正在更改。即使在调试中。

以下代码：

public class test{ 
    Card lastCard; 
    public test(){ 
     this.lastCard=null; 
    } 

    public void setLastCard(Card lcard){ 

     this.lastCard=lcard; 
    } 

    public Card getLastCard(){ 

     return this.lastCard; 
    } 

    static test hPlayer = new test(); 
    static test wPlayer = new test(); 

    public static Card generateCard(Random randoCard){ 
     Suit s = Suit.values()[randoCard.nextInt(Suit.values().length)]; 
     Rank r = Rank.values()[randoCard.nextInt(Rank.values().length)]; 
     System.out.println("IN METHOD--->Suit: "+s+" Rank: "+r); 
     return new Card(s,r); 
    } 

    public static void main(String[] args) throws InterruptedException { 
     Random randoCard = new Random(System.currentTimeMillis()); 

     hPlayer.setLastCard(generateCard(randoCard)); 
     System.out.println("House: " +hPlayer.getLastCard()); 
     TimeUnit.SECONDS.sleep(10); 

     wPlayer.setLastCard(generateCard(randoCard)); 
     System.out.println("House: " +hPlayer.getLastCard()+" Player: "+ wPlayer.getLastCard()); 

    } 
} 

Answer 1

既然你没有提供卡类，我认为这是一个基本值类：

public class Card { 
    private final Suit suit; 
    private final Rank rank; 

    public Card(Suit suit, Rank rank) { 
     this.suit = suit; 
     this.rank = rank; 
    } 

    @Override 
    public String toString() { 
     return "Card [suit=" + suit + ", rank=" + rank + "]"; 
    } 
} 

运行你的代码，然后给我的输出：

IN METHOD--->Suit: SPADES Rank: FOUR 
House: Card [suit=SPADES, rank=FOUR] 
IN METHOD--->Suit: CLUBS Rank: THREE 
House: Card [suit=SPADES, rank=FOUR] Player: Card [suit=CLUBS, rank=THREE] 

因此，看起来你似乎有一个你在发布之前修复的错字（参考或者你的卡实现不是一个值类（它是否使用静态字段？）