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.