int n = array.length / 2; if (array.length % 2 == 0) { Arrays.fill(array, 0, n, a); Arrays.fill(array, n, array.length, c); } else Arrays.fill(array, 0, n + 1, a); Arrays.fill(array, n + 1, array.length, c); System.out.println(Arrays.toString(array)); } }