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Constructors in java

Constructors in Java

Constructors in Java

Constructor in java is a special method that is automatically called when an object of a class is created. Constructor name should be similar to the class name. It cannot have a return type.

Types of Constructor

There are two types of  constructor in java.

  • Default constructor
  • Parameterized constructor

Default constructor:

A constructor without containing any parameter that is called a Default constructor. 

Example:

class ConstructorSample
{
ConstructorSample()
{
System.out.println("Constructor called");
}
}
class ConstructorMain
{
public static void main(String[] args)
{
ConstructorSample  CS= new ConstructorSample();
}
}

Output:

Constructor called

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Parameterized constructor

A constructor with one or more than one parameter that is called as a Default constructor.

Example:

class Square
{
int side;
Square(int a)
{
side=a;
}
}
class AreaOfSquare
{
public static void main(String[] args)
{
Square S= new Square(7);
System.out.println("Area of Square is:"+S.side*S.side);
}
}

Output:

Area of Square is:49

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