A java code to implement the special form of postfix calculation.

The code(solution) here should have at least 3 classes. Use Stack class(not java built in stack class) data structure

For a long time,you have been using one very classic calculator, a collector's item these days, the HP-35. It was the first handheld calculator manufactured by Hewlett-Packard in 1972. It required the user to input all arithmetic expressions in postfix notation because evaluating postfix expressions is much simpler for a computer algorithm than regular infix. However, after a disastrous accident, your calculator is no longer functional. You decide to implement its special form of postfix calculation yourself.

Postfix notation is an unambiguous way of writing an arithmetic expression without parentheses.

The program should input an arithmetic expression in postfix notation and then evaluate it, outputting the answer.

To simplify things, assume that the input expression only consists of single-digit values.Also assume only the four basic arithmetic operators are used: +, -, *, and /. When the user inputs a forward slash ("/") it should be interpreted as regular division (not integer division).

Fix the program so that it works on inputs with values that are more than one digit long as well. Assume that the user will enter spaces between values