Collision between a circle and square

Newbie & Debugging Questions
#1

I’m making a simple game where you control a square and lose if you touch a circle. How would I detect this collision?

#2

Ellispe2D.intersects(), JavaDoc:

public boolean intersects(double x, double y, double w, double h)

Tests if the interior of this Ellipse2D intersects the interior of a specified rectangular area.

#3

ok thanks