OOPS Quiz (Set 20) - Upskilling Engineers

OOPS (Set 20)

1 / 10

What is the purpose of the 'transient' keyword in Java?

To indicate that a class cannot be inherited

To indicate that a method is abstract

To indicate that a variable should not be serialized

To indicate that a variable should always have a specific value

2 / 10

What is the difference between a shallow copy and a deep copy of an object?

A shallow copy creates a new object with copies of all internal objects, while a deep copy creates a new object with references to the same internal objects

A shallow copy and a deep copy are the same thing

A shallow copy and a deep copy both create new objects with new internal objects

A shallow copy creates a new object with references to the same internal objects, while a deep copy creates a new object with copies of all internal objects

3 / 10

What is the purpose of the 'finalize' method in Java?

To explicitly destroy objects and release memory

To clean up resources held by objects before they are garbage collected

To create a new instance of a class

To define a new method in a class

4 / 10

What is a default constructor in Java?

A constructor with parameters that is defined by the programmer

A constructor used for type casting

A constructor that can only be accessed from within the class

A constructor with no parameters that is automatically created by the compiler

5 / 10

What is the difference between 'this' and 'super' in Java?

'this' refers to the parent class, while 'super' refers to the current instance of a class

'this' refers to the current instance of a class, while 'super' refers to the next instance of a class

'this' refers to the current instance of a class, while 'super' refers to the parent class

'this' and 'super' are interchangeable keywords

6 / 10

What is a constructor in Java?

A method used to create instances of classes

A method used to access private members of a class

A method used for type casting

A method used to override a superclass method

7 / 10

What is a static nested class in Java?

A class that can only be used within the method it's defined in

A class defined inside another class that is marked as 'static'

A class that can only be used within the package it's defined in

A class that cannot have any instance variables

8 / 10

What is the 'instanceof' operator used for in Java?

To create a new instance of a class

To access methods of another class

To check if an object belongs to a specific class or interface

To perform type casting

9 / 10

What does the term 'constructor chaining' refer to in Java?

Calling methods from constructors

Calling one constructor from another constructor within the same class or from a subclass constructor

Creating multiple instances of a class

Using static methods to create instances

10 / 10

What is method overriding in Java?

Creating a new method with the same name in a subclass

Creating a new class with the same name

Calling a method from another method

Defining multiple constructors

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