Simple Calculator - Where To Add ParseInt Function

I need to create a simple calculator in Java. Below is what I have so far; it is not working currently and I'm not sure why. I also needed to add the parseInt function somewhere in the code but I'm not sure where.

import java.util.Scanner;
public class CalcDemo {
public static void main(String[] args){
}
private int valueA;
private int valueB;
private String operator;
private char operatorA;
public int getvalueA() {
return valueA;
} .....