How to merge two arrays in Java? Finding an efficient way to concatenate

Hello everyone! I'm a beginner in Java (studying for about a month) and I've encountered a task that seems simple, but I can't find an elegant solution. I need to merge two integer arrays into one. For example, I have arrays `int[] a = {1, 2, 3}` and `int[] b = {4, 5, 6}`. I want to get a third array `c = {1, 2, 3, 4, 5, 6}`. I wrote this code: ```java int[] a = {1, 2, 3}; int[] b = {4, 5, 6}; int[] c = new int[a.length + b.length]; for (int i = 0; i < a.length; i++) { c[i] = a[i]; } for (int i = 0; i < b.length; i++) { c[a.length + i] = b[i]; } ``` It works, but looks cumbersome. I feel like Java should have something built-in for such a common operation. I tried using `Arrays.concat()` or `c = a + b`, but the compiler complains. Please advise