public class Main { public static void main(String[] args) { int[] a = {1, 2, 3}; int[] b = {4, 5}; int[] merged = new int[a.length + b.length]; int idx = 0; for (int n : a) merged[idx++] = n; for (int n : b) merged[idx++] = n; for (int n : merged) { System.out.print(n + " "); } } }