Java: returning subclass in superclass method signature

Question

I\'m working on a problem where there are several implementations of Foo, accompanied by several FooBuilder\'s. While Foo\'s share sev

Answer 1

Having found this excellent answer I am now sharing it around.

public class SuperClass
{
    @SuppressWarnings( "unchecked" ) // If you're annoyed by Lint.
    public I doStuff( Object withThings )
    {
        // Do stuff with things.
        return (I)this ; // Will always cast to the subclass. Causes the Lint warning.
    }
}

public class ImplementationOne
extends SuperClass
{} // doStuff() will return an instance of ImplementationOne

public class ImplementationTwo
extends SuperClass
{} // doStuff() will return an instance of ImplementationTwo