Simple Inheritance Example in Java

inheritance.java

/* super.super is not allowed in Java. */
import java.io.*;

class A
{
	private int a_data;
	public A(int a_data)
	{
		System.out.println("Class A constructor is called");
		this.a_data = a_data;
	}
	public void printdata()
	{
		System.out.println(this.a_data);
	}
}

class B extends A
{
	private int b_data;
	public B(int b_data)
	{
		super(0); /* B has all fields of A, and these fields need to be initialized */
		System.out.println("Class B constructor is called");
		this.b_data = b_data;
	}
	public void printdata()
	{
		super.printdata();
		System.out.println(this.b_data);
	}
}

class C extends B
{
	private int c_data;
	public C(int c_data)
	{
		super(1);
		System.out.println("Class C constructor is called");
		this.c_data = c_data;
	}
	public void printdata()
	{
		super.printdata();
		System.out.println(this.c_data);
	}
}

class Ideone
{
	public static void main (String[] args)
	{
		C ob = new C(5);
		ob.printdata();
	}
}