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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