How to extend an array?

Question

Hi,
how to extend an array
int[] b = new int[] {1, 2, 3};by adding 4, 5, 6 without copying?
thanks a lot
aldo

Answer 1

You can't
     int [] b = {1,2,3};
     int [] a = {4,5,6};
     int [] tmp = new int [b.length + a.length];
     System.arraycopy(b, 0, tmp, 0, b.length);
     System.arraycopy(a, 0, tmp, b.length ,a.length);
     b = tmp;
     System.out.println(Arrays.toString(b));