多维数组

1.一维数组

int[] arr1 = {1,2,3};

System.out.println(arr1[0]);

2.二维数组

//[4][2]，四行二列
/*
    1,1  arr2[0]
    2,2  arr2[1]
    3,3  arr2[2]
    4,4  arr2[3]
*/
int[][] arr2 = {{1,1},{2,2},{3,3},{4,4}};

printArray(arr2[0]);
System.out.println(arr2[0][1]);

public static void printArray(int[] arrays){
     for (int i = 0; i < arrays.length; i++) {
         System.out.print(arrays[i] + " ");
     }
}

二维数组的不同维度元素打印方式不同。

3.二维数组的遍历

int[][] arr2 = {{1,1},{2,2},{3,3},{4,4}};

for (int i = 0; i < arr2.length; i++) { //外层
    for (int j = 0; j < arr2[i].length; j++) { //内层
        System.out.print(arr2[i][j] + " ");
    }
}