A Calculator Example Program (With Java Code)

The following Java code is for a simple calculator. There are nine JButtons to represent the numbers 1 to 9, and three JButtons for addition, subtraction and totaling the result. A JTextField at the top keeps track of the numbers being pressed and the result of the arithmetic operation. Java Code The purpose of this Java program  is to show how to implement an  ActionListener  interface for handling JButton button  event  clicks by using the containing class, an inner class, and  an anonymous inner class.