How To Use Single Inheritance in Java

Now, we will first write a program using a "has a relationship " in Single Inheritance.

Step 1

Let's open Notepad and enter the following code.

Code

class Test
{
    void show()
    {
        System.out.println("welcome in java method");
    }
}
class demo
{
    public static void main(String arg[])
    {
        Test t = new Test();
        t.show();
    }
}

Step 2

Name it "hasrel.java" and save the file in any location. I saved at "C:/kiran/program".

Step 3

Open a command prompt (press window+R and enter cmd and hit OK).



Step 4

Go to the "command prompt".



Step 5

Go to "C:/kiran/program" by cmd.



Step 6

Now, enter the following code for cheking my Java file is compiled or not.

javac hasrel.java



My Java file is compiled succesfully.

Step 7

Enter the following code into the command prompt. Press Enter and see the output.

Java demo

//demo is a class name that is written in my "hasrel.java" file.

Output



We will now enter the program using a "is a relationship " in Single Inheritance.

Step 8

Enter the following code in Notepad.

Code

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

Step 9

Now, enter the following code for cheking my Java file is compiled or not.

javac hasrel.java



My Java file is compiled succesfully.

Step 10

Repeat Step 7.

Output



I hope you like this Java file.

Happy Codding.