To implement Java Program to create a user-defined package and access it in another program.

Explanation

This Java code defines a class named Calculator within a user-defined package called mypack.

1. package mypack;: This line is crucial. It declares that the Calculator class belongs to the mypack package. A package acts as a container for classes, similar to folders for files, helping to organize related classes and prevent naming conflicts.
2. public class Calculator { ... }: This defines a class named Calculator. The public keyword makes this class accessible from any other class, even those outside the mypack package. This is essential for demonstrating how to "access it in another program" as stated in the experiment name.
3. public int add(int a, int b) { ... }: Inside the Calculator class, a method named add is defined.
   • public: This access modifier means the add method can be called from any other class.
   • int: This is the return type, indicating that the method will return an integer value.
   • add: This is the name of the method.
   • (int a, int b): These are the parameters. The method expects two integer values, a and b, as input.
   • return a + b;: This is the body of the method. It performs the addition of the two input integers a and b and returns their sum.

In essence, this code creates a simple, reusable Calculator component that lives in its own mypack namespace and offers a single public method to perform addition. This class can then be imported and utilized by other Java programs.

Algorithm

The algorithm implemented by this code is straightforward:

1. Declare a package named mypack.
2. Define a public class named Calculator within the mypack package.
3. Inside the Calculator class, define a public method named add.
4. The add method takes two integer parameters, a and b.
5. The add method calculates the sum of a and b.
6. The add method returns the calculated sum as an integer.