Java for loop by value or by reference -

i figured out a problem in code. first code:

public class main {      /**      * @param args      */     public static void main(string[] args) {         string[] blablubb = { "a", "b", "c" };          for(string s : blablubb) {             s = "over";         }         printarray(blablubb);           (int = 0; < blablubb.length; i++) {             blablubb[i] = "over";         }         printarray(blablubb);      }      public static void printarray(string[] arr) {         for( string s : arr ) {             system.out.println(s);         }     }  } 

the output is:

a b c on over on 

i assumed first loop overwrite string in array. output on in case. seems creates copy of value instead creating reference. never perceived this. doing wrong? there option create reference instead?

//edit: seems knows except me. i'm c background , doesn't pay enough attention term reference different c. happily took me 10 minutes figure out (this time).

this:

for (string s : blablubb) {      s = "over"; } 

is equal this:

for (int = 0; < blablubb.length; i++) {      string s = blablubb[i];      s = "over"; } 

this creates temporary string copy of value array , change copy. that's why blablubb[] content stays untouched.

if want change values in array, use second option:

for (int = 0; < blablubb.length; i++) {              blablubb[i] = "over"; } 

and, way, can print array 1 line:

system.out.println(arrays.tostring(blablubb));