Unnecessary unboxing in java - how to refactor the code?

Question

I have the following Java 8 code (simplified for demonstration):

public Double fooBar(int a) {
    return Double.valueOf(a);
}

Now IntelliJ IDEA tells me that I have unnecessary boxing in the return statement. I'd understand this problem if a were a double type, but for an int I feel that I need the boxing to have the conversion to double.

Is there a good way to refactor this code which I currently don't see or is the error message from IntelliJ IDEA at this point simply not optimal?

Thanks for help

Answer 1

If you use alt-enter to use the suggested resolution"Remove boxing", the result is this:

public Double fooBar(int a) {
    return (double) a;
}

In this case the conversion from int to double is very explicit, whilst at the same time avoiding manual boxing.