int i = 1; int j = 2; // Good swap double temp = a[i]; a[i] = a[j]; a[j] = temp; // Bad swap a[i] = a[j]; a[j] = a[i];

public static void main(String[] args) {
    int i = 1;
    int j = 2;
    int[] a = new int[10];
    // Good swap
    int temp = a[i];
    a[i] = a[j];
    a[j] = temp;
    // Bad swap
    a[i] = a[j];
    a[j] = a[i];
}