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Object Oriented Language

Object Oriented Language

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What is inheritance in Java OOP?

A mechanism for creating multiple objects from a single class

A mechanism for overriding methods in a subclass

A mechanism for creating a new class based on an existing class

A mechanism for hiding implementation details and showing only necessary information

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Can a private inner class be accessed from another class?

No, private inner classes cannot be accessed from another class

Yes, but only if the other class is a subclass

Yes, but only if the other class is in the same package

Yes, private inner classes can be accessed from another class

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

To implement an interface

To override a method

To extend a class

To hide a method

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Can an abstract class be instantiated directly?

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

Yes, an abstract class can be instantiated directly

Yes, but only if the class has no abstract methods

No, an abstract class cannot be instantiated directly

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What is the difference between method overriding and method hiding?

Method overriding is used to implement an interface, while method hiding is used to extend a class

Method overriding and method hiding are the same

Method overriding is used to hide a method in a superclass, while method hiding is used to override a method in a superclass

Method overriding is used to override a method in a superclass, while method hiding is used to hide a method in a superclass

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Can a class have multiple private constructors?

Yes, multiple private constructors are allowed

No, only one private constructor is allowed

No, private constructors are not allowed

Yes, but only one can be used at a time

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Can a subclass have multiple superclasses in Java?

No, a subclass can have only one superclass

Yes, a subclass can have multiple superclasses

Yes, but only if the superclasses are interfaces

Yes, but only if the superclasses are in the same package

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Can a subclass call a method in its superclass using the "super" keyword?

No, a subclass cannot call a method in its superclass using the "super" keyword

Yes, but only if the method is public

Yes, a subclass can call a method in its superclass using the "super" keyword

Yes, but only if the method is protected

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Can a class have multiple methods with the same name but different return types?

Yes, but only if the methods have different parameter lists

No, a class cannot have multiple methods with the same name but different return types

Yes, a class can have multiple methods with the same name but different return types

Yes, but only if the methods are static

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What is an object in Java?

An instance of a class

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