在Java中组合数组

public class ArrayCombination {
    public static void main(String[] args) {
        int[] array1 = {1, 2, 3};
        int[] array2 = {4, 5, 6};
        int[] array3 = {7, 8, 9};

        int length = array1.length + array2.length + array3.length;
        int[] combinedArray = new int[length];

        int index = 0;
        for (int i = 0; i < array1.length; i++) {
            combinedArray[index] = array1[i];
            index++;
        }

        for (int i = 0; i < array2.length; i++) {
            combinedArray[index] = array2[i];
            index++;
        }

        for (int i = 0; i < array3.length; i++) {
            combinedArray[index] = array3[i];
            index++;
        }

        // 打印组合后的数组
        for (int i = 0; i < combinedArray.length; i++) {
            System.out.print(combinedArray[i] + " ");
        }
    }
}

import java.util.Arrays;

public class ArrayCombination {
    public static void main(String[] args) {
        int[] array1 = {1, 2, 3};
        int[] array2 = {4, 5, 6};
        int[] array3 = {7, 8, 9};

        int length = array1.length + array2.length + array3.length;
        int[] combinedArray = new int[length];

        int index = 0;
        System.arraycopy(array1, 0, combinedArray, index, array1.length);
        index += array1.length;

        System.arraycopy(array2, 0, combinedArray, index, array2.length);
        index += array2.length;

        System.arraycopy(array3, 0, combinedArray, index, array3.length);
        index += array3.length;

        // 打印组合后的数组
        for (int i = 0; i < combinedArray.length; i++) {
            System.out.print(combinedArray[i] + " ");
        }
    }
}