Java-rectangle-using-JOptionPane Rectangle class that models a rectangle's properties and behaviors. The class includes methods for calculating its perimeter and area, as well as constructors and ...

Description- The "Rectangle Area Calculator" Java program takes user input for the length and width of a rectangle, calculates its area, and displays the result. It showcases basic user interaction ...

If you want to do this yourself the simplest approach is using XOR rendering to make it trivial to "undo" the previous rectangle you drew (if any) and then draw the next.