Question

Understand what inheritance is and the purpose behind it - Promotes software reusabiiity - Superclass (base class) and subclass (derived class) relationship - Is-a relationship - Subdas b a supercias (not the other way areund) - Using extend kevward to apply inheritance - Protected access modifier - Should not feally use (lose ichlormauon hiding property and data integrity of supereiau) - Uro private wath gevern and setten - The use of super keyword and when to use it - Overridden methods (redefined methods) (as opposed to overloading methods) - Subciass can redefine a duperclass method with a mare appropriate implementation (has to have eact same signature and access modifier) - Which method wifi the compiter call if both are the iame? - Are constructors inherited? - Why?

Answer 1

Inheritance promotes software reusability by establishing a superclass and subclass relationship. The 'extends' keyword is used to apply inheritance in Java. Constructors are not inherited, but the 'super' keyword can be used to call the superclass constructor.

Step-by-step explanation

Inheritance is a key concept in object-oriented programming that promotes software reusability. It establishes a superclass (base class) and subclass (derived class) relationship, where the subclass inherits properties and behaviors from the superclass. This relationship is known as an 'is-a' relationship, meaning that a subclass is a specialized version of the superclassTo apply inheritance in Java, the 'extends' keyword is used to indicate that a class is inheriting from another class. The access modifier 'protected' is often used when defining superclass members to allow subclasses to access them.

However, it is generally recommended not to use 'protected' excessively, as it can compromise information hiding and data integrityThe 'super' keyword is used to refer to the superclass from a subclass. It is commonly used to call the superclass constructor or to access superclass methods or variables. When a subclass redefines a method from the superclass with the same signature and access modifier, it is called method overridingWhen both the superclass and subclass have a method with the same name and signature, the compiler will call the method from the subclass. However, if both methods have different access modifiers, the method in the subclass must have the same or wider access modifier than the corresponding method in the superclassConstructors are not inherited, but a subclass can call the superclass constructor using the 'super' keyword. This allows the subclass to initialize the inherited members defined in the superclass.