Java关于图形重叠的计算

[snow126]

* Add an abstract public method `boolean overlaps(Shape other)` to `Shape` that
takes a single `Shape` as an argument and returns `true` if the other shape
overlaps the shape it is called on. Assume the squares are upright (parallel
to the axis).
要求：一个Shape类，有内部类Circle和Square，写一个boolean overlaps(Shape other)计算是否两个图形是否有重叠，有返回true，否则false。如何简单的写出圆和正方形，正方形和正方形以及圆和圆是否有重叠。求思路