Java 数组拷贝

public static void main(String[] args) throws Exception{
    int[] nums = new int[]{1,2,3,4,5,6,7,8,9,10,11};
    System.arraycopy(nums, 5, nums, 0,
                     nums.length - 5);
    System.out.println(Arrays.toString(nums));
}

输出：[6, 7, 8, 9, 10, 11, 7, 8, 9, 10, 11]

注：由于仅拷贝第五位到最后一位，故而只有前面的元素改变，后边的元素没有变化，如果只想保留拷贝部分，也可以用以下方法：

    public static void main(String[] args) throws Exception{
        int[] nums = new int[]{1,2,3,4,5,6,7,8,9,10,11};
        int[] copyNums = new int[6];
        System.arraycopy(nums, 5, copyNums, 0,
                copyNums.length);
        System.out.println(Arrays.toString(copyNums));
    }

输出：[6, 7, 8, 9, 10, 11]