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

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

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

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answered Nov 17, 2021 at 11:36

rongfeiyue

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1 Comment

Neeraj Over a year ago

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