16 Questions
What is the main benefit of inheritance in object-oriented programming?
Reusability
What is a subclass in Java?
Any class below a specific class in the class hierarchy
How do you create a final class in Java?
Using the 'final' keyword
What does the 'extends' keyword do in Java?
Derives a class from another class
What happens when a subclass overrides a method of its superclass?
The subclass method replaces the superclass method
Why is it beneficial to override methods of superclasses in Java?
To customize behavior specific to the subclass
What is the purpose of using 'extends' in the code snippet public class Student extends Person?
To inherit all the properties and methods of the existing class Person
When a Student object is instantiated, what is the sequence of constructor execution based on the given code?
Inside Person:Constructor followed by Inside Student:Constructor
What is the output of the program when the code snippet public static void main( String[] args ){ Student anna = new Student(); } is executed?
Inside Person:Constructor Inside Student:Constructor
What does the 'super' keyword do in a subclass constructor?
It calls a constructor of its immediate superclass
In which constructor definition can the super() call be used?
It can only be used in a subclass's constructor definition
What happens if the super() call does not occur as the first statement in a subclass constructor?
It results in an error at compile time
What does using 'super( "SomeName", "SomeAddress" );' do in the code snippet public Student(){ super( "SomeName", "SomeAddress" ); System.out.println("Inside Student:Constructor"); }?
It explicitly calls a specific constructor of its immediate superclass
'This implies that the this() construct and the super() calls CANNOT BOTH OCCUR IN THE SAME CONSTRUCTOR.' What is the purpose of this rule?
'this()' and 'super()' cannot coexist to avoid ambiguity in method or constructor calls
'A super constructor call in the constructor of a subclass will result in the execution of relevant constructor from the superclass, based on the arguments passed.' What concept does this statement explain?
Inheritance
'Since a student is also a person, we decide to just extend the class Person'. Which concept does this statement illustrate?
Inheritance
Test your understanding of inheritance in Java programming, including defining super classes, subclasses, overriding methods, and creating final methods and classes.
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