$4.$ Write a Java program that does the following

$$

a$.$ When the user presses the mouse button, draw a blue rectangle that completely fills the JPanel and that has a $10$ pixel black border $($i$.$e$.,$ the rectangle has the black border$)$

b$.$ When the user releases the mouse button, draw a green rectangle that completely fills the JPanel and that has a $10$ pixel black border $($i$.$e$.,$ the rectangle has the black border$)$

c$.$ The JPanel should initially appear as a $100$x$100$ pixel object but it can be resized.

d$.$ The JPanel should be added to the center of its JFrames content pane.

$$

Below is an example GUI

$20$ Marks