Introduction

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
  1. class Test
  2. {
  3. void show()
  4. {
  5. System.out.println("welcome in java method");
  6. }
  7. }
  8. class demo
  9. {
  10. public static void main(String arg[])
  11. {
  12. Test t = new Test();
  13. t.show();
  14. }
  15. }
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 successfully.
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
  1. class Test
  2. {
  3. void show()
  4. {
  5. System.out.println("welcome in java method!!!");
  6. }
  7. }
  8. class demo extends Test
  9. {
  10. public static void main(String arg[])
  11. {
  12. demo d = new demo();
  13. d.show();
  14. }
  15. }
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.