Consider the definition of the following class:

public class TestClass

{

private int x;

private int y;

//default constructor to initialize the instance variables to 0

public TestClass( ) {}

//constructor with parameters to initialize the instance variables to the values

//specified by the parameters

public TestClass(int a, int b) {}

//return the sum of the instance variables

public int sum( ) {}

//return the product of the instance variables

public int product( ) {}

//print the values of the instance variables

public void print( ) {}

}

Write the definitions of the 5 methods as described in the definition of the class TestClass.

Write a complete demo test program with the main( ) to test ALL of the operations of the TestDemoClass class.

java basic programing course simple as possible use java import and comments to explain the code thanks in advance