I though this was a common problem, but i can’t find any solution to it.
There’s an enum, something like
public enum MyEnum { C, G, A, T, U }
I need to compare one enum instance with another, like this:
C complements G
G complements C
A complements T
T complements A
U complements T
T complements U
How can i do it without writing code like this:
public boolean complements(MyEnum other) {
if(this.compareTo(C) == 0) {
if(other.compareTo(G) {
return true;
} else return false;
}
...
}
Thanks in advance.
Answer
Why not have a complements field? You can have it be an EnumSet.
enum MyEnum {
G, C, A, T, U;
static {
C.complements = EnumSet.of(G);
G.complements = EnumSet.of(C);
A.complements = EnumSet.of(T);
T.complements = EnumSet.of(A, U);
U.complements = EnumSet.of(T);
}
private EnumSet<MyEnum> complements;
public boolean complements(MyEnum other) {
return complements.contains(other);
}
}