default constructor:

4 Default Constructor is a constructor that takes no arguments.

4 Default Constructor is compulsory when there are parameterized constructors and one or more objects have no arguments in the program.

4 Default constructor is always advised to avoid garbage values for data members because this is used for providing default values for data-members.

4 Generally, this is used for assigning default initialization of values for the properties of the object.

Example:

class point

{

private int x,y;

point() // default Constructor

{

x=y=0;

}

point(int xx, int yy)

{

x=xx;

y=yy;

}

}

class Test

{

public static void main(String as[])

{

point p1=new point(3,4);

point p2= new point();

}

}

Explanation: In the above example, there are two constructors: constructor without arguments (default constructor) and constructor with two arguments. Default constructor is called for the object “p2” and its “x” and “y” are initialized to “0” i.e. default value