java - 获取调用哪个枚举常量

Question

有没有办法为枚举中的每个常量调用不同的方法？

public enum ShipType {
   SMALL,MEDIUM,LARGE,ENORMOUS,TETRIS;

   public int[][] getRegionOfShip(int[] startingPosition, Aligment aligment){
      //How do can I decide which function to call?
   }
   private int[][] getRegionOfSmallShip(int[] startingPosition){
      ...
   }
   private int[][] getRegionOfMediumShip(int[] startingPosition, Aligment aligment){
      ...
   }

   private int[][] getRegionOfLargeShip(int[] startingPosition, Aligment aligment){
      ...
   }

   private int[][] getRegionOfEnourmusShip(int[] startingPosition, Aligment aligment){
      ...
   }

   private int[][] getRegionOfTetrisShip(int[] startingPosition, Aligment aligment){
      ...
   }
}

当我像这样创建枚举时:

ShipType shipType = ShipType.SMALL;

我称之为:

shipType.getRegionOfShip(startingPosition,aligment);

我怎样才能调用

private int[][] getRegionOfSmallShip(int[] startingPosition)

方法？比如检查在 Enum 类中调用了哪个 Constant

Answer 1

与其创建一个单独的方法来调用每个枚举值，不如重写该方法:

public enum ShipType {
SMALL{
    @Override
    public int[][] getRegionOfShip(int[] startingPosition, Aligment aligment){

    }
},
MEDIUM{
    @Override
    public int[][] getRegionOfShip(int[] startingPosition, Aligment aligment){

    }
};
public abstract int[][] getRegionOfShip(int[] startingPosition, Aligment aligment);

如果您选择此选项，您将避免在添加新的船舶类型时向您的 ifs/switch 添加一个 case，并且不会忘记在没有编译时错误的情况下实现该方法。