java string split example

Hi,

I tried below link
http://www.tutorialspoint.com/java/java_string_split.htm

i did not understand why we got same output 4 times?

import java.io.*;

public class Test{
   public static void main(String args[]){
      String Str = new String("Welcome-to-Tutorialspoint.com");

      System.out.println("Return Value :" );
      for (String retval: Str.split("-", 2)){
         System.out.println(retval);
      }
      System.out.println("");
      System.out.println("Return Value :" );
      for (String retval: Str.split("-", 3)){
         System.out.println(retval);
      }
      System.out.println("");
      System.out.println("Return Value :" );
      for (String retval: Str.split("-", 0)){
         System.out.println(retval);
      }
      System.out.println("");
      System.out.println("Return Value :" );
      for (String retval: Str.split("-")){
         System.out.println(retval);
      }
   }
}
This produces the following result:

Return Value :
Welcome
to-Tutorialspoint.com

Return Value :
Welcome
to
Tutorialspoint.com

Return Value:
Welcome
to
Tutorialspoint.com

Return Value :
Welcome
to
Tutorialspoint.com

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