compare Two variables of enum in java

Question

public enum Direction {
  UP,
  RIGHT,
  DOWN,
  LEFT,
}

i have two enum variables (a and b), in one case i have to check, if b is the next of a for example if a=UP and b=RIGHT. and also if a=left and b=UP. mabe something like this:

if(Direction.valueOf(a+1)==Direction.valueOf(b))

but when a=LEFT it would be out of bounds like an array right ?

honestly I would not bother valueOf(). Just check their ordinal() with % — Jack
– Jack, Commented Nov 17, 2021 at 12:05

score 2 · Accepted Answer · 2021-11-18 14:57:50Z

2

Try this.

public enum Direction {
    UP,
    RIGHT,
    DOWN,
    LEFT;
    
    private static final Direction[] VALUES = values();
    
    public Direction next() {
        return VALUES[(ordinal() + 1) % VALUES.length];
    }
  }

public static void main(String[] args) {
    Direction a = Direction.LEFT;
    Direction b = Direction.UP;
    System.out.println(a.next() == b);
}

output:

true

edited Nov 18, 2021 at 14:57

answered Nov 17, 2021 at 11:42

user17233545

Sign up to request clarification or add additional context in comments.

Comments

Suraj Rao · Accepted Answer · 2021-11-17 11:37:52Z

1

if (b == Direction.values()[(a.ordinal() + 1) % Direction.values().length])

edited Nov 17, 2021 at 11:37

Suraj Rao

29.7k11 gold badges96 silver badges104 bronze badges

answered Nov 17, 2021 at 11:36

rongfeiyue

1494 bronze badges

1 Comment

Neeraj Over a year ago

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

Collectives™ on Stack Overflow

compare Two variables of enum in java

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related