What is the Difference Between Default and Parameterized Constructor

The default constructor is a constructor that the compiler automatically generates in the absence of any programmer-defined constructors. Conversely, the parameterized constructor is a constructor that the programmer creates with one or more parameters to initialize the instance variables of a class.

1. What is default constructor and parameterized constructor?
2. What is the difference between parameterized constructor and copy constructor?
3. What are parameterized constructors?
4. What is default constructor with example?
5. Can we use default argument in parameterized constructor?
6. Can constructor be private?
7. Which type of constructor can't have a return type?
8. What happens if a user forgets to define a constructor inside a class?
9. Can a constructor call another constructor?
10. What is parameterized constructor give an example?
11. What is destructor example?
12. How many arguments does parameterized constructor contain?

What is default constructor and parameterized constructor?

Default constructor provides the default values to the object like 0, null, etc. depending on the type. ... Parameterized Constructor: A constructor that has parameters is known as parameterized constructor. If we want to initialize fields of the class with your own values, then use a parameterized constructor.

What is the difference between parameterized constructor and copy constructor?

Parameterized Constructors: It is possible to pass arguments to constructors. Typically, these arguments help initialize an object when it is created. ... Copy Constructor: A copy constructor is a member function which initializes an object using another object of the same class.

What are parameterized constructors?

The parameterized constructors are the constructors having a specific number of arguments to be passed. The purpose of a parameterized constructor is to assign user-wanted specific values to the instance variables of different objects. A parameterized constructor is written explicitly by a programmer.

What is default constructor with example?

In computer programming languages, the term default constructor can refer to a constructor that is automatically generated by the compiler in the absence of any programmer-defined constructors (e.g. in Java), and is usually a nullary constructor.

Can we use default argument in parameterized constructor?

Like all functions, a constructor can have default arguments. They are used to initialize member objects. ... Note that if a constructor has any arguments that do not have default values, it is not a default constructor. The following example defines a class with one constructor and two default constructors.

Can constructor be private?

Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.

Which type of constructor can't have a return type?

No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class.

What happens if a user forgets to define a constructor inside a class?

7. What happens if a user forgets to define a constructor inside a class? Explanation: The C++ compiler always provides a default constructor if one forgets to define a constructor inside a class.

Can a constructor call another constructor?

Yes, any number of constructors can be present in a class and they can be called by another constructor using this() [Please do not confuse this() constructor call with this keyword]. this() or this(args) should be the first line in the constructor. This is known as constructor overloading.

What is parameterized constructor give an example?

Parameterized Constructor – A constructor is called Parameterized Constructor when it accepts a specific number of parameters. To initialize data members of a class with distinct values. In the above example, we are passing a string and an integer to the object.

What is destructor example?

A destructor is a member function that is invoked automatically when the object goes out of scope or is explicitly destroyed by a call to delete . A destructor has the same name as the class, preceded by a tilde ( ~ ). For example, the destructor for class String is declared: ~String() .

How many arguments does parameterized constructor contain?

Constructors that can take at least one argument are termed as parameterized constructors. When an object is declared in a parameterized constructor, the initial values have to be passed as arguments to the constructor function.