How to Use Multilevel Inheritance in Java

Introduction

Please go through my first article on Single Level Inheritance in Java:

How to use Single Inheritance in Java 

 

In this article we learn about multilevel inheritance using Notepad.

A class can be derived from a derived class and that is known as multilevel inheritance.

Step 1

Let's open Notepad and write the following code:

 

class A
{
    void disp()
    {
        System.out.println("disp method");
    }
}
class Test extends A
{
    void show()
    {
        System.out.println("show method");
    }
}
class demo extends Test
{
    public static void main(String arg[])
    {
        demo d=new demo();
        d.show();
        d.disp();
    }
}

 

Step 2

In this program we use "extends" to inherit all the properties from the base class or the parent's class.

Step 3

Name it "multy.java"and save the file in any location. I saved mine at "c:/kiran/program".

Step 4

Open a command prompt (press Windows + R and write cmd and hit OK).

Step 5

Go to "c:/app" using the command prompt.

Step 6

Set the path (path set means where you save your Java file).

Step 7

Now write the following code for checking whether or not the Java file has compiled.

 

javac swap.java

 

My Java program compiled successfully.

Step 8

Write the following code in the command prompt. Press Enter and see the output.

 

java demo
// demo is a class name which is written in my "swap.java" file.

 

Output

Happy coding.