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Develop a program which consists of the package named let_me_calculate with a class name Calculator and a method name add to add two integer numbers. Import let_me_calculate package in another program (class name Demo) to add two number.

Code:
package let_me_calculate;
public class Calculator
{
    public void add()
   {
     int a=20;
     int b=30;
     int c;
     c=a+b;
    System.out.println("Addition = "+c);
  }
}
import let_me_calculate.*;
class Demo
{
   public static void main(String args[])
  {
    Calculator obj=new Calculator();
    obj.add();
   }
}
Output:

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