can variable have multiple enum constants in java?

Question

I am building simple java game which the user has to find gold. There are some obstacles like Orc, Goblin, and Poop.

What I am trying to do is that I am creating Cell and Board class.

Inside of my Cell class,

public Cell{
  public enum TheCell { Orc, Goblin, Poop, Gold, Empty};
    TheCell type;
  public Cell(TheCell type){
    this.type = type;
  }
}

and I make two dimensions in Board class,

public Board{
  Cell[][] grid = new Cell[7][7];
  Random r = new Random();

  for(int i = 0; i<3; i++){
    int randNum1 = r.nextInt(7);
    int randNum2 = r.nextInt(7);
    grid[randNum1][randNum2] = new Cell(Cell.TheCell.Orc);
  }
  for(int i = 0; i<3; i++){
    int randNum1 = r.nextInt(7);
    int randNum2 = r.nextInt(7);
    grid[randNum1][randNum2] = new Cell(Cell.TheCell.Goblin);
  }
}

My question is that, in case of Orc and Goblin are same cell, I wanna keep them both monster in same cell. Is there some how I can keep both or multiple obstacles in same cell? Thank you!

the code certainly needs formatting. And I doubt you can save two values in a cell of the array. Maybe Map might solve it for you with multiple values -> http://stackoverflow.com/questions/4956844/hashmap-with-multiple-values-under-the-same-key — Naman, Nov 08 '16 at 05:26

Gernot · Answer 1 · 2016-11-08T06:22:22.833

2

One way to achieve this is to have the Cell class hold a list of all monsters/things that are currently on the cell (using the enum, that is already available)

~~A more "low level" approach is to use an Integer for the cell and then use bitflags to model multiple obstacles on the same cell.~~

Update: I agree with @ajb, in this case an Enum Set should be used

As pointed out by @JimGarrison, the EnumSet approach only works until you need to have more than one instance of an enum value for one cell.

edited Nov 08 '16 at 06:22

answered Nov 08 '16 at 05:24

Gernot

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2

No need to use an integer--Java provides `EnumSet`. (Either way will work only if you can't have more than one of the same obstacle.) – ajb Nov 08 '16 at 05:26
@Jay Sure, or you can go to the javadoc [here](http://docs.oracle.com/javase/8/docs/api/java/util/EnumSet.html) – ajb Nov 08 '16 at 05:33
2

`EnumSet` works until you need to have more than one instance of an enum value. You could have 2 Orcs or 2 Goblins converge on a cell in some version of the game. – Jim Garrison Nov 08 '16 at 06:10
@Jay You're even encouraged to google for any terms you're not familiar with. – Kayaman Nov 08 '16 at 06:10
@JimGarrison Okay. I will check it out too Thank you! – jayko03 Nov 08 '16 at 17:11
@Kayaman Of course, I can. Problem is that sometimes I don't know what to google or keyword to search. – jayko03 Nov 09 '16 at 00:30

score -2 · Answer 2 · answered Nov 08 '16 at 05:29

-2

public Cell{
  public enum TheCell { Orc, Goblin, Poop, Gold, Empty};

  List<TheCell> type = new ArrayList<TheCell>();

  public Cell(TheCell type){
    addType(type);
  }

  public addType(TheCell type) {
    this.type.add(type);
  }
}

answered Nov 08 '16 at 05:29

Степан Введенский

1

can variable have multiple enum constants in java?

2 Answers2