Peer Learning OOPS

Peer Learning OOPS

Technical Aptitude - Level 2 Basics

Multiple Select

Main features of OOPS

• Encapsulation

• Abstraction

• Inheritance

• Polymorphism

• Exception handling

Main features of OOPS

- Inheritance

- Encapsulation

- Polymorphism

- Data Abstraction

Multiple Choice

Which is known as Static Polymorphism ?

• Compile Time

• Run Time

• Both are together called Static Polymorphism

• None of the above

Multiple Choice

Which of the following is known as Dynamic Polymorphism ?

• Compile Time

• Run Time

• Both are together called as Dynamic Polymorphism

• None of the above

Static and Dynamic Polymorphism

- Compile time polymorphism is also known as Static Polymorphism

- Runtime polymorphism, also known as Dynamic Polymorphism

Multiple Choice

Is it always necessary to create objects from class?

• Yes

• No

Is it always necessary to create objects from class?

No. An object is necessary to be created if the base class has non-static methods. But if the class has static methods, then objects don’t need to be created. You can call the class method directly in this case, using the class name.

Multiple Select

Overloading and Overriding (Choose all options that apply)

• Overloading is a compile-time polymorphism

• Overriding is a runtime polymorphism

• Overloading is a runtime polymorphism

• Overriding is a compile-time polymorphism

Difference between overloading and overriding

Overloading is a compile-time polymorphism feature in which an entity has multiple implementations with the same name. For example, Method overloading and Operator overloading.

Overriding is a runtime polymorphism feature in which an entity has the same name, but its implementation changes during execution. For example, Method overriding.

Multiple Choice

public class Demo{

public static void main(String[] arr){

System.out.println(“Main1”);

}

public static void main(String arr){

System.out.println(“Main2”);

}

}

Predict the output.

• Main1

• Main2

• Compile Error

• Run Time Error

Multiple Select

Choose the right option for Private access Modifier

• Not accessible from derived class

• Accessible from derived class

• Accessible from own class

• Not accessible from own class

Multiple Select

Choose the right options for Protected access modifier.

• Accessible within package

• Not Accessible within package

• Accessible outside package by sub class

• Not Accessible outside package by sub class

Multiple Select

Choose the correct option on Array vs Array List.

• Array: Size should be given at the time of declaration.

• Array List: Size may not be required in declaration

• Array: We need to specify index for operation

• Array List: No Index required, instead we use inbuilt functions

Multiple Select

Difference - final , finally, finalize.

• final: keyword

  finally: block

  finalize: method

• final: keyword

  finally: method

  finalize: block

• final: method

  finally: block

  finalize: method

• final: block

  finally: method

  finalize: keyword

Poll

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• Good

• Satisfactory

• We expect something else

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