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How to use java two-dimensional array

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2019-05-21 11:32:008056browse

Java's two-dimensional array is actually a nested one-bit array (each row is regarded as an inner one-dimensional array)

How to use java two-dimensional array

Definition format

数据类型[][] 数组名 = new 数据类型[二维数组的长度/包含的一维数组的个数][每个一维数组的长度];
int[][] arr = new int[3][5];//定义了一个整型的二维数组,其中包含3个一维数组,每个一维数组可以存储5个整数
arr[0]//下标为0的位置上的一维数组
arr[1][3]//如果要获取具体的元素需要两个下标
数据类型[][] 数组名 = new 数据类型[二维数组的长度/包含的一维数组的个数][];
数据类型[][] 数组名 = {{元素},{元素1,元素2},……};
int[][] arr = {{2,5},{1},{3,2,4},{1,7,5,9}};
[]在变量名前的时候,是紧跟数据类型的;如果[]在后,则是属于当前变量名。

int[][] arr = new int[3][];----Represents a two-dimensional array containing three one-dimensional arrays of integers

How to use java two-dimensional array

Application of two-dimensional array

The length of the two-dimensional array: array name.length ---Each one-dimensional array: array name [subscript ].length

Traversal of two-dimensional array---double for loop

for(int i = 0; i <p><strong>Enter the number of lines from the console and print the corresponding Yang Hui triangle</strong></p><pre class="brush:php;toolbar:false"> //从控制台获取行数
Scanner s = new Scanner(System.in);
int row = s.nextInt();
//根据行数定义好二维数组,由于每一行的元素个数不同,所以不定义每一行的个数
int[][] arr = new int[row][];
//遍历二维数组
for(int i = 0; i <p> Result: </p><pre class="brush:php;toolbar:false">1
1   1
1   2   1
1   3   3   1
1   4   6   4   1
1   5   10  10  5   1

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