import java.util.Arrays;

public class Test8{

public static void main(String[] args){

//申明方式一

int[][] arr = new int[2][];

int[] a = {1, 4, 7};

int[] b = {2, 5, 8};

arr[0] = a;

arr[1] = b;

for(int i=0; i<arr.length; i++){

// for(int j=0; j<arr[i].length; j++){

// System.out.print(arr[i][j]);

// }

System.out.println(Arrays.toString(arr[i]));

// System.out.println();

}

System.out.println("-----------");

// System.out.println(Arrays.toString(arr));

//申明方式二

int[][] arr2 = new int[2][3];

arr2[1] = new int[]{1, 4, 7, 8, 5};

System.out.println(arr2[1][4]);

System.out.println("-----------");

//申明方式三

int[][]arr3 = {{1, 4, 7, 8}, {2, 5, 8, 3}, {0, 1, 2, 4}};

System.out.println("-----------");

System.out.println(Arrays.toString(arr3[2]));

int[][]arr4 = new int[][]{{1, 4, 7, 8}, {2, 5, 8, 3}, {0, 1, 2, 4}};

System.out.println(Arrays.toString(arr4[2]));

}

}