Question 1

What is encapsulation in Java?

Accepted Answer

Encapsulation is the bundling of data and methods together within a class.

Answer

Encapsulation is the ability of a method to exist with the same name in different classes.

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Encapsulation is the process of creating multiple objects from a class.

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Encapsulation is inheritance between classes.

Question 2

What does extending a class mean in Java?

Accepted Answer

Extending a class means creating a new class (child class) that inherits all the properties and methods of an existing class (parent class).

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Extending a class means copying all the properties and methods of another class.

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Extending a class means creating a separate class that has its own properties and methods independent of any other class.

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Extending a class means creating a duplicate class with the same properties and methods.

Question 3

What is the purpose of getter and setter methods in Java?

Accepted Answer

Getter and setter methods are used to access and modify the values of private class variables.

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Getter and setter methods are used to print information to the console.

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Getter and setter methods are used to create new objects in Java.

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Getter and setter methods are used to define the behavior of a class.

Question 4

What is the purpose of access modifiers in Java?

Accepted Answer

Access modifiers control the visibility and accessibility of class members (variables and methods).

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Access modifiers define the size and range of variables.

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Access modifiers determine the order of execution of methods.

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Access modifiers control the lifespan of objects.

Question 5

What is the difference between instance variables and local variables in Java?

Accepted Answer

Instance variables are declared within a class but outside any method, and they have separate copies for each object instance. Local variables are declared within a method or block, and they are only accessible within that method or block.

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Instance variables and local variables are two different terms used to refer to the same concept.

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Instance variables are used for temporary storage of data. Local variables hold data that needs to persist throughout the entire execution of a class.

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Instance variables are declared within a method or block and can be accessed from anywhere in the class. Local variables are declared within a class but outside any method.

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Instance variables are only accessible within the main method. Local variables are declared within a class but outside any method.

Question 6

What is the concept of inheritance in Java?

Accepted Answer

Inheritance is a mechanism in Java where a class can inherit properties and methods from another class.

Answer

Inheritance is the ability of a method to exist with the same name in different classes.

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Inheritance is the bundling of data and methods together within a class.

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Inheritance is the process of creating multiple objects from a class.

Question 7

What is the difference between method overloading and method overriding in Java?

Accepted Answer

Method overloading is having multiple methods with the same name but different parameters in the same class. Method overriding is the ability of a subclass to provide its own implementation of a method defined in its superclass.

Answer

Method overloading and method overriding have the same functionality in Java.

Answer

Method overloading is the ability of a subclass to provide its own implementation of a method defined in its superclass. Method overriding is having multiple methods with the same name but different parameters in the same class.

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Method overloading is the process of creating multiple objects from a class. Method overriding is the bundling of data and methods together within a class.

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