一维数组：
四种方式:
int[] arr = new int[3];
int arr[] = new int[3];
int[] arr = new int[]{1,2,3};
int[] arr = {1,2,3};
常见的错误有: int[] arr = new int[3]{}

二维数组:
三种方式:
int[][] arr = new int[3][2];
int[][] arr = new int[3][];
int[][] arr = {{1,2,3},{4,5},{6,7,8,9}};

错误格式有:
int[][] arr = new int[][3];

一维数组：
四种方式:
int[] arr = new int[3];
int arr[] = new int[3];
int[] arr = new int[]{1,2,3};
int[] arr = {1,2,3};
常见的错误有: int[] arr = new int[3]{}

二维数组:
三种方式:
int[][] arr = new int[3][2];
int[][] arr = new int[3][];
int[][] arr = {{1,2,3},{4,5},{6,7,8,9}};

错误格式有:
int[][] arr = new int[][3];