ArrayList not using the overridden equals

Question

I\'m having a problem with getting an ArrayList to correctly use an overriden equals. the problem is that I\'m trying to use the equals to only test for a single key field, and

Answer 1

As many posts have said, the problem is that list.indexOf(obj) function calls "equals" of the obj, not the items on the list.

I had the same problem and "contains()" didn't satisfy me, as I need to know where is the element!. My aproach is to create an empty element with just the parameter to compare, and then call indexOf.

Implement a function like this,

public static InnerClass empty(String testKey) {
    InnerClass in = new InnerClass();
    in.testKey =testKey;
    return in;
}

And then, call indexOf like this:

ind position = list.indexOf(InnerClass.empty(key));