Can a class have a constructor with default parameters?

Like all functions, a constructor can have default arguments. They are used to initialize member objects.

What happens when a class with parameterized constructor and having no default constructor?

What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor? Compile-time error.

What is the difference between the default constructor and a constructor with parameters?

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.

What will happen if only one parameterized constructor is explicitly defined?

Explanation: Protected access modifier means that constructor can be accessed by child classes of the parent class and classes in the same package. 8. Explanation: The class compiles successfully. But the object creation of that class gives a compilation error.

When parameters are added to the constructor it is called as?

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.

When you define your own parameterized constructor What does Java do with the default no argument constructor?

And if we write a constructor with arguments or no-arguments then the compiler does not create a default constructor. Default constructor provides the default values to the object like 0, null, etc.

What is parameterized constructor in C++ with example?

Explanation: Private variables a and b are declared in the class Example. A parameterized constructor is declared using the function Example. It includes two methods getA() and getB(). In the main class, the constructor is called, and the constructor’s access values are assigned.

What is the default constructor for a class?

Whenever we define one or more non-default constructors ( with parameters ) for a class, a default constructor ( without parameters ) should also be explicitly defined as the compiler will not provide a default constructor in this case. However, it is not necessary but it’s considered to be the best practice to always define a default constructor.

What happens if there are no constructors for a class?

That’s why if there are no constructors, java compiler will add a default constructor and calls super class constructor. When we do not explicitly define a constructor for a class, then java creates a default constructor for the class. It is essentially a non-parameterized constructor, i.e. it doesn’t accept any arguments.

Why doesn’t compiler create default constructor for a parameterized constructor?

When you don’t define any constructor in your class, compiler defines default one for you, however when you declare any constructor (in your example you have already defined a parameterized constructor), compiler doesn’t do it for you. Since you have defined a constructor in class code, compiler didn’t create default one.

What happens if we write a constructor with no arguments?

And if we write a constructor with arguments or no-arguments then the compiler does not create a default constructor. Default constructor provides the default values to the object like 0, null, etc. depending on the type.