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