by using super keyword

Hi,

Using super you can invoke constructor which is in parent 
class. to invoke constructor which is in the same class we 
have to use this. for example:

public class Point {
    int m_x;
    int m_y;

    //============ Constructor
    public Point(int x, int y) {
        m_x = x;
        m_y = y;
    }

    //============ Parameterless default constructor
    public Point() {
        this(0, 0);  // Calls other constructor.
    }
    . . .
}

I think we find that anything you could have done in Java by
calling the default constructor from another constructor,
you can do easily in Curl by calling the default constructor
from a factory.

. In one constructor, the first statement can be a call on
another constructor in the same class (use keyword this
instead of the class-name) or a call on a constructor of the
superclass (use keyword super instead of the class-name). In
a constructor for a subclass, the first statement must be
either this(…); or super(…); —if not, the call super(); is
automatically inserted for you.

We can call the parent class constructor from the child 
class constructor.

class Parent
{
 int a;
 Parent(int x)
 {
  a=x;
 }
}
class Child extends Parent
{
 int b;
 Child(int x,int y)
 {
  super(x);
  b=y;
  System.out.println(a);
  System.out.println(b);
 }
}

class Test
{
public static void main(String args[])
{
 Child obj = new Child(1,2);	 
}
}

This.constructername() keyword can be used with in the 
class to refer. To use super class constructer we need to 
give super.consturctername().

constructor call from one class to another class by useing
the keyword super()(default),super(-)(parameter constructor)