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

Title of script: Calling methods of the super class

Author: Arya Ratish

Keywords: super keyword, video tutorial, Java, Eclipse IDE

Visual Cue	Narration
Slide 1	Welcome to the spoken-tutorial on Calling methods of the super class.
Slide 2	In this tutorial we will learn  : when to use the super keyword how to call methods of the super class how to invoke the constructor of the super class
Slide 3 Software Requirements	Here we are using Ubuntu Version 12.04 JDK 1.7 Eclipse 4.3.1
Slide 4 Prerequisites	To follow this tutorial, you must have basic knowledge of Java and Eclipse IDE. You must also have knowledge of subclassing and method overriding. If not, for relevant tutorials, please visit our website.
Slide 5 Using super keyword	A subclass can use a superclass data or method using the super keyword.
Slide 6 Using super keyword	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.
Go to the IDE.	Now, let us go to the IDE and to the project we created earlier.
Go to the Manager class.	Let us go to the Manager class.
Come to the getDetails() method. Remove Name and Email.	Now, come to the getDetails() method. In the return statement, let us remove Name and Email.
Go to the Employee class. Highlight the getDetails() method.	Let us come to the Employee class. This is the parent class or super class. We already have a getDetails() method here.
Highlight the return statement.	This method returns the name and email.
	So, we can use the getDetails() method in the Manager class.
Go to the Manager class.	We will come to the Manager class.
	We will call  getDetails() method from the Employee class, inside the Manager class.
Come to the getDetails() method.	So, come to the getDetails() method.
Inside the return statement type super dot getDetails().	Inside the return statement type super dot getDetails()  plus within double quotes Manager of plus department.
Run the program.	Now, let me run the program again.
Highlight the output.	We can see that we get the Manager details.
Come back to the Employee class.	Come back to the Employee class.
	Let us include a constructor here.
Type public Employee(String name, String email_address)  { this.name=name; this.email_address=email_address; }	So inside the Employee class, type public space Employee within brackets String name, String email_address Within curly brackets, type this dot name is equal to name semicolon this dot email_address is equal to email_address semicolon
	Also comment the setter and getter methods.
Type public String getDetails() { return("Name: " + name + "\n" + "Email: " + email_address); }	Inside the getDetails() method,   instead of getName type name, instead of getEmail type email_address.
	A subclass inherits all of the methods and variables from a parent class. Note that it does not inherit constructors.
	But, constructors can call the non-private constructors of its superclass. We do this using the keyword super from the child class constructor.
Come to the Manager class.	We will see that now. For that, come to the Manager class. Now, we will include a constructor here.
Type public Manager(String name, String email_address, String dept) { super(name,email_address); department=dept; }	Type public space Manager within brackets String space name, String space email  address, String space dept Then within curly brackets, type super within brackets name, email address semicolon Then type, department is equal to dept semicolon
	Here we will comment the setter and getter methods.
Type public String getDetails() { return ( super.getDetails()+"\n" +"Manager of: " + department); }	Then, in the getDetails() method type department instead of getDepartment.
	Now, come to the TestEmployee class.
Comment manager.setName("Nikkita Dinesh"); manager.setEmail("abc@gmail.com"); manager.setDepartment("Accounts");	Comment the call to the setter methods.
Type Manager manager= new Manager("Nikkita Dinesh", "abc@gmail.com", "Accounts");	Now, inside the call to the Manager constructor type within quotes Nikkita Dinesh, abc@gmail.com, Accounts
	Now, run the program.
Highlight Name: Nikkita Dinesh Email: abc@gmail.com Manager of: Accounts	We get the output as shown. We get the Manager details.
	In this way, we can call the constructor of the super class.
Slide 7 Summary	In this tutorial we have learnt: the super keyword calling the method of the super class and invoking constructor of super class
Slide 8 Assignment	Assignment Open the previous assignment. Call the Vehicle class run method in the Bike class. The output should be: The Vehicle is running. The Bike is running safely.
Slide 9 About Spoken Tutorial Project	* Watch the video available at the following link It summarizes the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide 10 About Spoken Tutorial workshops	The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates for those who pass an online test For more details, please write to contact at spoken hyphen tutorial dot org
Slide 11 Acknowledgement	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at http://spoken-tutorial.org/NMEICT- Intro This is Arya Ratish from IIT Bombay signing off. Thanks for joining.

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