Java中不常见的数组语法

public void printArray(int... numbers) {
    for (int num : numbers) {
        System.out.println(num);
    }
}

printArray(1, 2, 3); // 调用可变参数方法

int[][] arr = new int[3][];
arr[0] = new int[2];
arr[1] = new int[3];
arr[2] = new int[4];

arr[0][0] = 1;
arr[0][1] = 2;
arr[1][0] = 3;
arr[1][1] = 4;
arr[1][2] = 5;
arr[2][0] = 6;
arr[2][1] = 7;
arr[2][2] = 8;
arr[2][3] = 9;

int[] arr = new int[]{1, 2, 3, 4, 5}; // 匿名初始化数组

// 或者可以简写为：
int[] arr = {1, 2, 3, 4, 5}; // 省略了new int[]

// 二维数组的匿名初始化：
int[][] arr2D = {{1, 2}, {3, 4, 5}, {6, 7, 8, 9}};

public void updateArray(int[] arr) {
    for (int i = 0; i < arr.length; i++) {
        arr[i] += 10;
    }
}

int[] numbers = {1, 2, 3, 4, 5};
updateArray(numbers);
System.out.println(Arrays.toString(numbers)); // 输出 [11, 12, 13, 14, 15]

int[] source = {1, 2, 3, 4, 5};
int[] destination1 = Arrays.copyOf(source, source.length);
int[] destination2 = new int[source.length];
System.arraycopy(source, 0, destination2, 0, source.length);