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Object Oriented Language

Object Oriented Language

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What is polymorphism in Java OOP?

The ability of an object to take on multiple forms

The ability of a class to inherit properties from another class

The ability of a method to override another method

The ability of a variable to hold multiple values

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What is the purpose of the "this" keyword in Java?

To refer to the subclass

To refer to the interface

To refer to the superclass

To refer to the current object

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What is the benefit of using private access modifier in Java?

It allows access to the variable from any class

It allows access to the variable from any package

It allows access to the variable only within the same class

It allows access to the variable from any subclass

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What are the four access modifiers in Java?

public, private, protected, and abstract

public, private, protected, and static

public, private, protected, and default

public, private, protected, and final

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What is the default access modifier in Java?

default (no modifier.

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What is the benefit of using encapsulation in terms of code reusability?

It reduces code complexity

It improves code readability

It makes code easier to modify and extend

It enables code reusability

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Can a subclass implement an interface that is already implemented by its superclass?

Yes, but only if the interface is a functional interface

Yes, a subclass can implement an interface that is already implemented by its superclass

Yes, but only if the interface is a marker interface

No, a subclass cannot implement an interface that is already implemented by its superclass

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Can a final method be overridden in a subclass?

Yes, a final method can be overridden in a subclass

Yes, but only if the subclass is a nested class

Yes, but only if the subclass is in the same package

No, a final method cannot be overridden in a subclass

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What is the purpose of the "protected" access modifier?

To restrict access to a class, method, or variable within the same class

To allow access to a class, method, or variable within the same class and subclasses

To allow access to a class, method, or variable from anywhere

To declare a class, method, or variable as abstract

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Can a subclass hide a method in its superclass?

Yes, but only if the method is public

Yes, a subclass can hide a method in its superclass

Yes, but only if the method is private

No, a subclass cannot hide a method in its superclass

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