Java/C3/Calling-methods-of-the-superclass/English-timed

Time	Narration
00:01	Welcome to the spoken-tutorial on Calling methods of the super class.
00:07	In this tutorial, we will learn: * when to use the super keyword
00:13	* How to call methods of the super class
00:17	* How to invoke the constructor of the super class.
00:22	Here we are using: Ubuntu Version 12.04 JDK 1.7 Eclipse 4.3.1
00:32	To follow this tutorial, you must have basic knowledge of Java and Eclipse IDE.
00:39	You must also have knowledge of subclassing and method overriding in Java.
00:45	If not, for relevant tutorials, please visit our website.
00:51	A subclass can use a superclass data or method using the super keyword.
00:58	The super keyword : refers to the instance variable of the parent class. is used to invoke parent class constructor. is used to invoke parent class method.
01:13	Now, let us go to the IDE and to the project we created earlier.
01:19	Let us go to the Manager class.
01:22	Now, come to the getDetails() method.
01:26	In the return statement, let us remove Name and Email.
01:32	Now, let us come to the Employee class.
01:36	This is the parent class or super class.
01:41	We already have a getDetails() method here.
01:46	This method returns the name and email.
01:51	So, we can use this getDetails() method in the Manager class.
01:57	We will call getDetails() method from the Employee class, inside the Manager class.
02:04	So, come to the getDetails() method in the manager class.
02:10	Inside the return statement, type: super dot getDetails() plus slash n Manager of getDepartment().
02:22	Now, let me run the program.
02:25	We can see that we get the Manager details. Thus we can call the method of superclass inside the subclass.
02:36	Now let us come to the Employee class.
02:41	Let us include a constructor here.
02:44	So, inside the Employee class, type: public space Employee within brackets String name, String email_address .
02:59	Within curly brackets, type: this dot name is equal to name semicolon this dot email_address is equal to email_address
03:17	Now, let us comment the setter and getter methods.
03:23	Inside the getDetails() method- instead of getName, type name instead of getEmail, type email_address.
03:37	A subclass inherits all of the methods and variables from a parent class.
03:44	Note that it does not inherit constructors.
03:49	But, constructors can call the non-private constructors of its superclass.
03:55	We do this using the keyword super from the child class constructor.
04:01	We will see that now.
04:04	For that, come to the Manager class. We will include a constructor here.
04:10	So, type: public space Manager within brackets String space name comma String space email underscore address comma String space dept .
04:30	Then, within curly brackets, type: super within brackets name, email underscore address semicolon.
04:44	Then type: department is equal to dept semicolon.
04:51	Here we will comment the setter and getter methods.
04:56	Then, in the getDetails() method type: department instead of getDepartment.
05:05	Now, come to the TestEmployee class.
05:09	Comment the call to the setter methods.
05:15	Now, inside the call to the Manager constructor, type: within quotes Nikkita Dinesh, abc@gmail.com, Accounts.
05:32	Now, run the program.
05:35	We get the output as shown. We get the Manager details.
05:40	In this way, we can call the constructor of the super class.
05:45	In this tutorial, we have learnt: the super keyword calling the method of the super class and invoking constructor of super class.
05:56	As an Assignment- Open the previous assignment. Call the Vehicle class run method in the Bike class.
06:04	The output should be: The Vehicle is running. The Bike is running safely.
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07:05	This is Arya Ratish from IIT Bombay, signing off. Thanks for joining.

Contributors and Content Editors

Jyotisolanki, PoojaMoolya, Pratik kamble, Sandhya.np14