package java0907_api; public class Java151_System { public static void main(String[] args) { int[] arr1 = { 1, 5, 2, 4 }; int[] arr2 = { 6, 3, 9, 7, 8 }; int[] arr4 = { 4, 2 }; int[] arr3 = process(arr1, arr2, arr4); for (int data : arr3) System.out.printf("%3d", data); } public static int[] process(int[] arr1, int[] arr2, int[] arr4) { int[] data = new int[arr1.length + arr2.length + arr4.length]; /*for (int i = 0; i < arr1.length; i++) data[i] = arr1[i]; for (int i = 0; i < arr2.length; i++) data[arr1.length + i] = arr2[i]; for (int i = 0; i < arr4.length; i++) data[arr1.length + arr2.length + i] = arr4[i];*/ System.arraycopy(arr1, 0, data, 0, arr1.length); System.arraycopy(arr2, 0, data, arr1.length, arr2.length); System.arraycopy(arr4, 0, data, arr1.length + arr2.length, arr4.length); return data; } }