Question: 6. Question 3) (10 points -- CLO3] Consider the following Java class: 3 public class Calculator { 4 5- public int add(int x, int y)

6. Question 3) (10 points -- CLO3] Consider the following Java

6. Question 3) (10 points -- CLO3] Consider the following Java class: 3 public class Calculator { 4 5- public int add(int x, int y) { return x + y; 7 } 8- public int subtract(int x, int y) { 9 return x - y; 10 11 } Change this class to ensure the following two requirements: R 1) [ 7 points] Users can NEVER be able to create more than one instance of this class at all times. R 2) (3 points] Thread safety

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