hi, I try to mix the elements of a simple array, Is there a special function(can be for a String also).
Example:
int[] a=new int{1,2,3,4,5,6,7,8,9};
a...
print(result);
result: 3  5 1 2 7 4 9 6 8

Thank you, nice algorithm, I'll use it in my program. I think, it means that there is no any standard function to do this shuffle. )

java's Collections has a shuffle method. but by the time you've added the code to initialise the List (not an array) and the code to unbox from Integers to ints you may as well have written the half a dozen lines of the shuffle yourself.

Code:

ArrayList l = new ArrayList();

void setup() {
  // add elements
  for (int i = 1 ; i <= 9 ; i++) {
    l.add(i);
  }
  // shuffle
  Collections.shuffle(l);
  // convert to array (assuming you need an array)
  Integer[] a = new Integer[10];
  a = (Integer[])l.toArray(a);
  // print
  for (int i = 0 ; i < 9 ; i++) {
    println("[" + i + "]: " + a[i]); // these are Integers not ints
  }  
}
 

there is also an Arrays.toList() (to do the initial conversion from array to a list) but that seems to require java's generics (List<Integer>...) and i can't get it to work in processing (in the 5 minutes i tried it for)