差异法java使用枚举类型 [英] difference method java using enum types

问题描述

我想写一个方法可以返回2张卡的差价。
当我正在学习枚举并且不确定实现它的最有效方式时，我感到困惑。

  public class卡片可比较卡> {
 public enum等级{两，三，四，五，六，七，七，十，十八$ b JACK，女王，王，ACE} 
公开枚举西装{CLUBS，DIAMONDS ，HEARTS，SPADES} 
 
 public static int difference（Card c）{
 
} 
  

$

解决方案

  public enum Rank {ACE（1），TWO（2）; / *显然添加其他值* / 
 private int value; 
 Rank（int value）{
 this.value = value; 
}; 
 public int getValue（）{
 return this.value; 
} 
 
 public int calcDifference（Rank rank）{
 return getValue（） -  rank.getValue（）; 
} 
 
}; 
  

可以这样调用：

 排名rankAce = Rank.ACE; 
 System.out.println（rankAce.calcDifference（Rank.TWO））; 
  

您可以删除int值，只需使用序数，但这样可以让您有一定的灵活性。

I wish to write a method that can return the difference in value of 2 cards. Im confused as I'm learning enums and not sure of the most efficient way to implement it.

public class Card implements Comparable<Card> {
public enum Rank {TWO, THREE, FOUR, FIVE, SIX,SEVEN, EIGHT, NINE, TEN, 
                    JACK, QUEEN, KING, ACE}
public enum Suit {CLUBS, DIAMONDS, HEARTS, SPADES}

public static int difference(Card c){

}

Any help or guidance would be appreciated.

解决方案

public enum Rank {ACE(1), TWO(2); /* obviously add the other values*/
    private int value  ;
    Rank(int value){
        this.value = value;
    };
    public int getValue(){
       return this.value;
    }

    public int calcDifference(Rank rank){
        return getValue() - rank.getValue();
    }

};

which can then be called like so :

Rank rankAce =  Rank.ACE;
System.out.println(rankAce.calcDifference(Rank.TWO));

You could remove the int value and just use ordinal, but this way gives you a bit of flexibility.

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