inheritance example in Java

Extends example | Method Overriding

//1) Parent Class
package com.training.slc;

public class ParentClass {
	
	int number;
	String firstName;
	String lastName;
	int age;
	String middleName;
	
	public ParentClass(){
		
	}
	
	public ParentClass(int number, String firstName, String lastName, int age,
			String middleName) {
		super();
		this.number = number;
		this.firstName = firstName;
		this.lastName = lastName;
		this.age = age;
		this.middleName = middleName;
		
		System.out.println("PARENT CLASS CONSTRUCTOR");
	}
	
	public int addTwoNumbers(int a1, int a2){
		return a1+a2;
	}
	
	public int doSomeCalculation( int a1, int a2){
		return a1-a2;
	}

}

//2) Child Class
package com.training.slc;

public class ChildClass1 extends ParentClass {

public ChildClass1(int number, String firstName, String lastName, int age,
			String middleName) {
		
		super(number, firstName, lastName, age, middleName);
		System.out.println("Child Class");
		// TODO Auto-generated constructor stub
	}
	
	public int doSomeCalculation( int a1, int a2){
		return a1*a2;
	}
	
public static void main( String [] args)
{
	ChildClass1 childClass1 = new ChildClass1(1,"venu gopal","darur",32,"  ");
	
	
	 ParentClass p1 = new ChildClass1(1,"Ranadheer","Y",24,"  ");//1
	 ParentClass p2 = new ChildClass1(1,"Arun","Mavuram",22,"  ");//2
	 
	 
	 ParentClass p3 = new ParentClass(1,"Arun","Mavuram",22,"  ");//2
	 
	 int addition = p1.addTwoNumbers(10, 20);
	 System.out.println( "Addition in parent class is called   " +addition);
	 
	 int someCalculatedValue = p1.doSomeCalculation(30,25);
	 System.out.println( "Do some calculation  " +someCalculatedValue);
	 
	 int someCalculatedValue1 = p2.doSomeCalculation(30,25);
	 System.out.println( "Do some calculation  " +someCalculatedValue1);
	 
	 int someCalculatedValue2 = p3.doSomeCalculation(30,25);
	 System.out.println( "Do some calculation  " +someCalculatedValue2);
	 
	 
	 
	 System.out.println( childClass1.firstName);
	
}

}

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