3.9 Lab: Class Methods Methods are a core part of java. For each of the methods in the template below, complete the method as instructed This Lab will use a unit test to call the class methods instead of trying to match the printed output. LAB ACTIVITY 3.9.1: Lab: Class Methods 0/3 Calculator.java Load default template... 1 public class Calculator 3 double memoryValue; 4 5 public double add(double a, double b) double result: //perform the operation and assign it to result return result: 12 14 15 16 17 18 public double div(double a, double b) //create a variable named result //perform the operation and assign it to result //return the value 20 21 22 public void setMemoryValue double memoryValue) 23 24 25 26 27 28 public double getMemoryValue) //strore the method input into the class variable memmory value (use the "this" operator) //return the value stored in memory 30 31 34 35