Foreach loop

Question

Hello,
I am trying to convert a normal for loop to the new foreach loop. I was able to do one function that prints every element, but can't seem to be able to modify the elements in the array.
//This works ok
public static void printjoy(int [][] array1)
System.out.println();
for (int x[] : array1)
for (int y : x)
System.out.print(y);
System.out.println();
System.out.println();
//This causes no errors, but it doesn't do the "element plus 10". It just returns the same array unchanged.
public static void adjArray(int [][] array2)
for (int x[] : array2)
for (int y : x)
y = y +10;
This is the array declaration and initialization:
int [][] joy = {
{66,4,73,4},
{81,82,81,18},
{20,22,69,76},
{71,65,84,79}
This is how I call the two functions:
printjoy(joy); //original array
adjArray(joy); //add ten to each element
printjoy(joy); //print adjusted array
Thanks in advance for any help.
Message was edited by:
mgkicker

Answer 1

I am trying to convert a normal for loop to the new
foreach loop. I was able to do one function that
prints every element, but can't seem to be able to
modify the elements in the array.Right, you can't do that.
for (int ii : arr) {
  ii = 0; // just changes ii, not the array element it's a copy of
is equivalent to
for (int ix = 0; ix < arr.length; ix++) {
  int ii = arr[ix];
  ii = 0; // just changes ii, not the array element it's a copy of
}With the foreach loop, you don't have access to the array, only to the element's value.