Write a complete java program that will implement a calculator.

Ask the user to input a string such as 5+3 * 2 and give a correct answer of 11

Symbols that the calculator will need to parse and properly implement are:

+ - * / ^ ( ) ^ = exponent

If the user does not enter numbers or the above symbols print out an error as to where the error is.

If the user inputs a wrong equation such as (3*5) + (2 + 3 print out an error that there are missing closing parenthesis.

Equations can be entered as 3+6*(5+2)^2 or 3 + 6* (5 + 2 )^ 2 Notice spaces can be entered at random places.

The easiest way to check for errors and take out spaces is to use regular expressions.

You have to write your own stack classes. Both operator and operand!

You can use linked list as stacks or array. With array, you will have to implement resizing in case the array is too small.

Make sure you check for error and exceptions.