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GIVEN THIS PLEASE WRITE #6 import java.util.ArrayList; import java.util.NoSuchElementException; public class myStack { public ArrayList arr; public myStack(){ arr = new ArrayList (); public int

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import java.util.ArrayList; import java.util.NoSuchElementException; public class myStack { public ArrayList arr; public myStack(){ arr = new ArrayList(); public int size({ return arr.size(); public boolean isEmpty(){ return arr.size() == 0; public void push (Object element) { arr.add(element); public Object peek() { if (isEmpty()) { throw new NoSuchElementException(); int index = arr.size() - 1; return arr.get(index); public Object pop() { if (isEmpty()) { throw new NoSuchElementException(); int index = arr.size() - 1; return arr.remove(index); Question 6 (20 pts) Implement a Postfix Calculator in Java. Name this file postfix.java and submit with the homework. Your function will accept an input string from the command line containing a combination of numbers and operators. It will then compute this postfix expression using your Stack class from part a). Print the result. Example input: 3 10 5 + * " Resulting calculation: 10 + 5 = 15 3* 15 = 45 Example output: 45

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