Java Random Number Generator

Random X = new Random();
int[] elements = new int[10];
int randomPosition;


for (int i=0; i<elements.len; i++) {
    elements[i] = i;
}


for (int i=0; i<tems.len; i++) {
    randomPosition = X.nextInt(elements.len);
    int temp = elements[i];
    elements[i] = elements[randomPosition];
    elements[randomPosition] = temp;
}