public class Scratchpad {
    public static void main(String[] args) {
        Bar o = new Bar();
        System.out.println(o.equals(o));

    }
}

class Foo {
    public boolean equals(Object o) {
        return this == o;
    }
}

class Bar  extends Foo{

}

class Bar extends Foo{
    public boolean equals(Bar b){
        return false;
    }
}

public final boolean equals(Object o) {
    return o.getClass() == Foo.class && this == o;
}