Find the remaining Enum

I have the Enum A, B, C.
In a method, I am given two different Enum and must return the remaining Enum.

Example: I receive A and C I must return B

The solution that I have is to use if elseif else:

private EnumABC findRemaining(EnumABC pEnum1, EnumABC pEnum2){
    if((pEnum1 == EnumABC.A || pEnum2 == EnumABC.A) 
        && (pEnum1 == EnumABC.B || pEnum2 == EnumABC.B)){
        return EnumABC.C; 
    } else
    if((pEnum1 == EnumABC.A || pEnum2 == EnumABC.A)
        && (pEnum1 == EnumABC.C || pEnum2 == EnumABC.C)){
        return EnumABC.B;
    } else{
       return EnumABC.A;
    }
}

I was wondering if there was a more readable solution then this.

>Solution :

While Basil’s answer is the most elegant one, this one iterates and is rather readable:

enum EnumABC {
  A,B,C;

  EnumABC findRemaining(EnumABC other) {
    return Arrays.stream(values())
                 .filter(v -> v!=this&&v!=other)
                 .findFirst()
                 .get();
  }
}

This is now a method of the enum, so instead of

EnumABC remaining = findRemaining(pEnum1, pEnum2);

you have to call it using

EnumABC remaining = pEnum1.findRemaining(pEnum2);