Download the PostfixCalculator Evaluator lab kit, and complete the evaluate() method in the Evaluator class. There are some basic unit tests with some example evaluations; feel free to copy and edit those to make your own tests. Due at the end of next class.

Hint: you can use the built-in Java Stack class and use that in your program to store the operands (numbers). You do not need to use the code you just turned in (that way, any bugs you might have won't affect you here). To create a stack using the built-in types, try:

Stack<Double> s = new Stack<Double>();