Dive into the world of Java constructors with a collection of enlightening Multiple Choice Questions (MCQs). These MCQs act as interactive puzzles, guiding you through the art of creating and initializing objects in Java. Explore the nuances of default constructors, parameterized constructors, constructor chaining, and more. This article invites learners, from newcomers to seasoned programmers, to test their knowledge and gain a deeper understanding of how Constructors play a pivotal role in shaping Java programs. Whether you’re delving into Java for the first time or looking to bolster your expertise, these MCQs offer an engaging and insightful exploration into the world of Constructors.
1.) What is a constructor in Java?
A) A method used for creating objects
B) A special type of variable
C) A class used for method overloading
D) An access modifier
2.) Which of the following is true about constructors?
A) Constructors are inherited from parent classes.
B) Constructors can be declared as static methods.
C) Constructors can be overloaded.
D) Constructors can return values.
3.) Which keyword is used to call a constructor from within another constructor in the same class?
A) new
B) this
C) super
D) self
4.) If a class does not explicitly define any constructors, what type of constructor(s) is(are) automatically provided by Java?
A) Default constructor
B) Parameterized constructor
C) Copy constructor
D) Private constructor
5.) Which statement is true about the constructor of a subclass?
A) The constructor of the superclass is automatically inherited.
B) The constructor of the superclass must be copied into the subclass.
C) The constructor of the subclass must have the same name as the constructor of the superclass.
D) The constructor of the subclass can have a different signature than the constructor of the superclass.
6.) What is the purpose of the “super” keyword in a constructor?
A) To call a method of the superclass
B) To create a new object
C) To call the constructor of the superclass
D) To access static variables
7.) In Java, can a constructor be marked as “final”?
A) Yes, to prevent it from being overridden in subclasses.
B) Yes, to prevent it from being inherited by subclasses.
C) No, constructors cannot have access modifiers.
D) No, constructors cannot have modifiers.
8.) Which of the following is a valid way to create an object and call a constructor in Java?
A) MyClass object = new MyClass();
B) object = new constructor MyClass();
C) object = call new MyClass();
D) new MyClass(object);
9.) Can a constructor have a return type in Java?
A) Yes, but only if it is a parameterized constructor.
B) Yes, if it returns an object of the same class.
C) No, constructors cannot have a return type.
D) Yes, if it is a private constructor.
10.) What is the purpose of a copy constructor in Java?
A) To create a deep copy of an object
B) To copy the superclass’s constructor
C) To prevent object creation
D)To clone the object
