Constructors and Methods -Java Programming MCQ Questions and Answers

1

What is a constructor in Java?

A) A special method to create instances of classes B) A method used for mathematical calculations C) A method to perform string manipulations D) An exception handling mechanism

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Answer & Solution

Answer: Option A

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2

Which keyword is used to define a method in Java?

A) method B) def C) func D) public

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Answer & Solution

Answer: Option D

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3

In Java, which method is automatically called when an object is created?

A) start() B) main() C) init() D) constructor()

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Answer & Solution

Answer: Option D

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4

What is method overloading in Java?

A) Defining multiple methods with the same name in the same class B) Calling methods from another class C) Using methods to load data from a file D) Running methods in parallel threads

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Answer & Solution

Answer: Option A

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5

What does the "void" keyword indicate in a method declaration?

A) The method does not return any value B) The method is private C) The method returns an integer value D) The method is static

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Answer & Solution

Answer: Option A

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6

Which access modifier is used for a method that can be accessed from any class in the same package?

A) public B) private C) protected D) package-private (no modifier)

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Answer & Solution

Answer: Option D

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7

What is the return type of a constructor in Java?

A) void B) int C) The same as the class name D) String

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Answer & Solution

Answer: Option C

Solution:

Constructors are special methods in Java used to create objects of a class.
They have the same name as the class itself.
Unlike other methods, constructors don't have an explicit return type.
Their job is to initialize the object's member variables (fields) with values.
Therefore, they implicitly return a reference to the newly created object.
The correct answer is option C, because it correctly states the return type is implicitly the same as the class name.

8

What is the purpose of the "this" keyword in Java constructors and methods?

A) To refer to the current instance of the class B) To call another method C) To declare a local variable D) To indicate a static method

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Answer & Solution

Answer: Option A

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9

Which keyword is used to prevent method overriding in Java?

A) final B) abstract C) static D) override

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Answer & Solution

Answer: Option A

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10

What is the correct syntax to call a method named "myMethod" from an object "myObject"?

A) myObject.myMethod(); B) myMethod.myObject(); C) myMethod(); D) myObject->myMethod();

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Answer & Solution

Answer: Option A

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