Inaccurate for loop in Java array -

i've tried many hours solve array task, seems me i'm stuck. task create program prints number of given command line parameters , lists them.

you gave 2 command line parameters. below given parameters: 1. parameter: 3455 2. parameter: john_smith 

my program starts wrong index + i'm not sure given task. how program know how many parameters use if hasn't been initialized? or lost exercise?

this i've done:

    import java.util.scanner;  public class ex_01 {      public static void main(string[] args) {         // todo auto-generated method stub          scanner reader = new scanner(system.in);          int param = reader.nextint();          string[] matrix = new string[param];          (int = 0; < matrix.length; i++) {              matrix[i] = reader.nextline();// part loop fails          }          system.out.println("you gave " + matrix.length                 + " command line parameters.\nbelow given parameters:");         (int = 0; < matrix.length; i++) {              system.out.println(i + 1 + " parameter: " + matrix[i]);         }      }  } 

and own output:

3   //this number of how many parameters user wants input 2   // third one? omg //  gave 3 command line parameters. below given parameters: 1 parameter:  2 parameter: 2 3 parameter: omg 

edit:

i did it! did it!! after more googling found this:

        if (args.length == 0) {         system.out.println("no arguments given.");     } else {         (string : args) {          }     } 

then modified program , voilà program compiled. here whole program:

import java.util.scanner;  public class echo {       public static void main(string[] args) {         if (args.length == 0) {             system.out.println("no arguments given.");         } else {             (string : args) {              }         }          system.out.println("you gave " + args.length                 + " command line parameters.\nbelow given parameters:");         (int = 0; < args.length; i++) {              system.out.println(i + 1 + ". parameter: " + args[i]);        }          }      } 

i want thank answered this, needed! :)

command line arguments not text read program scanner , like, strings specified in args array argument main. seems need output contents of array instead of reading input , outputting it.