If you're feeling ambitious, design a GUI program called Calculator that simulates an old-school scientific calculator. The top level frame should be divided into two panels: one for the calculator's display (represented as a JTextField) and one for the buttons. The top level frame should use a BorderLayout, with the display at the North and the buttons at the Center, and the button panel should use a GridLayout. Include buttons for the arithmetic functions +, −, ×, ÷, =, and Clear. You can use the getText() method to retrieve the contents of a JTextField, and then convert it to a number using the Double.parseDouble(String) method. You could also include buttons for more advanced functions such as sin, cos, tan, sqrt, log, ex, and yx. For the trigonometric functions, you could also include a pair of mutually-exclusive radio buttons for switching between Degrees or Radians mode. You are free to make your calculator as fancy as you like. For example, your calculator might look something like the following:
