Components of Classes in Java ( PART - II )

                                                   

 From the Previous Blog we have discussed some of the components of java. Here are some of the other features of java.

Method Overloading

When a single class has multiple methods with same name , this is concept is called as Method Overloading . The compiler differenciate b/w the 2 methods based upon the number and type of arguments.

Program:

 // To illustrate method overloading

 class SumDemo
{
    void sum ( int a , int b)
 {
  System.out.println(" Sum of 2 number =" + (a+b));
  }
   void sum ( float a , float b)
  {
  System.out.println(" Sum of 2 floating point number =" +(a +b));
  }
  void sum ( int a ,int b , int c )
  {
  System.out.println(" Sum of 3 numbers =" + ( a+b+c));
 }
}

 class MethodOverloadDemo
{
  public static void main ( String [] args )
  {
   SumDemo s = new SumDemo( );
    s.sum(12 ,13,15);
    s.sum( 2.5F , 6.789F);
    s.sum( 33, 678 );
  }
}


Constructor Overloading

Like method overloading , constructor can be overloaded in the same manner. The compiler differenciates based on the number and type of arguments.

Program:

// To illustrate constructor overload
 class Sum
 {
   Sum ( int a , int b)
{
  System.out.println (" Sum of 2 number is =" + (a+b));
 }
  Sum ( float a , float b )
 {
  System.out.println ( " Sum of 2 float number is =" + (a+b));
  }
  Sum ( int a , int b , int c )
  {
  System.out.println (" Sum of 3 numbers is =" + (a+b+c));
  }
}
class ConstOverloadDemo
{
  public static void main ( String [] args )
  {
     Sum s = new Sum( 12 ,12,223);
     Sum s = new Sum (23.4F , 34.8F);
     Sum s = new Sum ( 25 , 34 );
  }
}


Recursion

Recursion is a process in which a method calls itself again and again.

Program:

// Program to find factorial of a number


  class Factorial
 {
   int fact ( int n )
  {
    int r ;

  if ( n==1 )
  return 1;
  r = fact ( n-1) * n;
   return r ;
  }
}                                                                               Output:
 class recursion                                         Factorial of 4 = 24
{
  public static void main ( String [] args )
 {
  Factorial f = new Factorial ();

 System.out.println (" Factorial of 4 =" + f.fact(4));
  }
 }