// Demonstration of the method overloading 
 public class Sum {
   // Driver code
   public static void main( String args[ ] ) {
     Sum s = new Sum( );
     if ( args.length == 3 )
       System.out.println( s.sum( Integer.parseInt( args[0] ),
                                  Integer.parseInt( args[1] ),
                                  Integer.parseInt( args[2] ) ) );
     else if ( args.length == 2 )
       // See whether the number is a double by checking
       // whether it contains a period.
       if ( args[0].(".") || args[1].(".") )
         System.out.println( s.sum( Double.parseDouble( args[0] ), 
                                    Double.parseDouble( args[1] ) ) );
       else
         System.out.println( s.sum( Integer.parseInt( args[0] ),
                                    Integer.parseInt( args[1] ) ) );
     else
       System.out.println( "Error" );
   }

   // Overloaded sum, which takes two int parameters
   public int sum( int x, int y ) { return x + y; } 

   // Overloaded sum, which takes three int parameters 
   public int sum( int x, int y, int z ) { return x + y + z; } 

   // Overloaded sum, which takes two double parameters 
   public double sum( double x, double y ) { return x + y; } 
 }