AP CSA inheritance flashcards

What is inheritance in Java?

Inheritance is a mechanism where one class inherits fields and methods from another class.

True or false: Subclasses can have their own methods.

True, because subclasses can define new methods in addition to inherited ones.

Difference between superclass and subclass?

The superclass is the parent class, while the subclass is the child class that inherits from it.

Define polymorphism.

Polymorphism allows methods to do different things based on the object that it is acting upon.

What keyword is used for inheritance?

The keyword 'extends' is used in Java to indicate that one class is inheriting from another.

Fill in the blank: A subclass inherits methods from its ______.

superclass.

True or false: A subclass can access private members of its superclass.

False, because private members are not accessible outside their own class.

What is a derived class?

A derived class is another term for a subclass which inherits properties and behaviors from a superclass.

What happens if a subclass overrides a method?

The subclass version of the method is called instead of the superclass method.

What is method overriding?

Method overriding occurs when a subclass provides a specific implementation of a method already defined in its superclass.

Difference between method overloading and overriding?

Overloading is defining multiple methods with the same name but different parameters; overriding is redefining a method in a subclass.

What is a constructor in inheritance?

A constructor initializes a new object. Subclasses can call the superclass constructor using 'super()'.

True or false: All classes in Java inherit from Object.

True, because Object is the root of the class hierarchy in Java.

What method is called when an object is created?

The constructor of the class is called.

Fill in the blank: Inheritance promotes ______ reuse.

code.

What is a multi-level inheritance?

Multi-level inheritance is when a class is derived from another derived class.

True or false: Java supports multiple inheritance.

False, because Java does not allow a class to inherit from more than one class.

What is an abstract class?

An abstract class cannot be instantiated and may contain abstract methods which must be implemented by subclasses.

What is an interface?

An interface defines a contract with methods that a class must implement, but does not provide method bodies.