My Java Code keeps returning unnecessarily?

    public double isLargerThan(Relatable other) {
    CirclePlus otherCirc = (CirclePlus)other;
    if (this.getArea() < otherCirc.getArea())
        return -1;           
    else if (this.getArea() > otherCirc.getArea())
        return 1;            
    else
        return 0;

}

This is my code, it keeps returning 0 in the final else statement but even when the conditions are met in the if/else if statements, it ignores them and just goes to the bottom and returns 0;

Can you help me to fix this? Also, just so I can learn more, can you explain why java is doing this?

Just the help will be okay too, thanks so much!