Class + Object + Encapsulation + Abstraction code example

Video: ClickMe

Open the eclipse 

Create the new java project Object-Oriented-Programming-OOP-Concepts-in-Java

Add the ClsCalculator.java 

package name:classobject.abstraction.encapsulation.tutorialbyexample.com

class name:ClsCalculator

Click finish

Output:

//ClsCalculator objCalculatorClass = new ClsCalculator();
1 + 1 = 2

ClsCalculator.java 

/**
 * 
 */
package classobject.abstraction.encapsulation.tutorialbyexample.com;

/**
 * @author Vinod Kumar
 *
 */
public class ClsCalculator {

 /**
  * Default constructor of ClsCalculator
  */
 public ClsCalculator() {
  // TODO Auto-generated constructor stub
 }

 /**
  * Addition of two numbers and print the value in console and return the
  * number as output.
  * 
  * @param parameter1
  * @param parameter2
  * @return
  */
 public int addition(int parameter1, int parameter2) {
  // addResult the local varible for storing the add result and used in
  // print
  // method and return.
  int addResult = parameter1 + parameter2;
  // Private method for internal use not outside of world
  print(parameter1, parameter2, addResult);
  return addResult;

 }

 /**
  * Private method for printing the addition of input and output for abstraction concepts 
  * 
  * @param arg1
  * @param arg2
  * @param argAdd
  */
 private void print(int arg1, int arg2, int argAdd) {
  System.out.println("" + arg1 + " + " + arg2 + " = " + argAdd);
 }
}


MainAppOfCalculator.java

/**
 * 
 */
package classobject.abstraction.encapsulation.tutorialbyexample.com;

/**
 * @author Vinod Kumar
 *
 */
public class MainAppOfCalculator {

 /**
  * Default Constructor of MainAppOfCalculator
  */
 public MainAppOfCalculator() {
  // TODO Auto-generated constructor stub
 }

 /**
  * Main method for creation the instance of {@link ClsCalculator}
  * ClsCalculator instance as object
  * 
  * @param a
  */
 public static void main(String a[]) {
  // Creating the instance of ClsCalculator() class.
  ClsCalculator objCalculatorClass = new ClsCalculator();
  // Calling the addition method with two parameter
  objCalculatorClass.addition(1, 1);

 }
}