java arrays reverse not understanding the logic -

i trying use code made reverse array. don't understand why getting [i@7a84639c output in console.

and reason why doesn't method save reversed array array? if add print @ bottom of x[i]=c[i]; shows array reversed when add call example karn[0] shows array isn't reversed. want solve staying true code made.

import java.util.arrays;  public class helloworld {   public static void main(string[] args) {       int[]karn={1,2,3};      rev(karn);     system.out.println(karn.tostring());   }     public static void rev(int[]x){     int[]c=new int[x.length];      for(int i=x.length-1;i>-1;i--){       c[i]=x[i];       x[i]=c[i];     }   } } 

in rev method using local variable c. value not transferred on main method. must return array , assign value old array:

public static int[] rev(int[]x){     //creates new array array different karn , local method.     //nothing outside of method can see array.     int[]c=new int[x.length];      for(int = 0; < c.length; i++){         //here swapping values placing first         //value @ last spot of array , on         c[c.length - - 1] = x[i];     }     //we must return new array made , assign karn our      //changes saved , seen outside of method     return c;   } 

in main method must assign changes of rev method karn. can assign value , display so:

karn = rev(karn);  //for each loop for(int : karn)     system.out.println(i);  //traditional loop for(int = 0; < karn.length; i++)     system.out.println(karn[i]); 

arrays not have default tostring() method. why seeing values of array like. need iterate through array display them console.