java 从二维数组java中提取数据
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Extract data from 2d array java
提问by user647207
How can i extract data from a 2d array.. e and b are indexes of the array
我如何从二维数组中提取数据.. e 和 b 是数组的索引
int e = IO.readInt();
int b = IO.readInt();
int a[][] = { { 8, 2, 6, 5 }, // row 0
{ 6, 3, 1, 0 }, // row 1
{ 8, 7, 9, 6 } };
for (int i = 0; i < a.length; i++) {
for (int j = 0; j < a[0].length; j++) {
a[i][j] = i;
System.out.print(a[i][j] + " ");
}
System.out.println("");
}`enter code here`
回答by basszero
More details would be nice but I'll take a stab (in the dark) at it ...
更多细节会很好，但我会（在黑暗中）刺伤它......
a[e][b]
回答by Computerish
You can think of a 2D array like a table. If you visualize it this way, your array a[]would look like this:
你可以把二维数组想象成一张桌子。如果您以这种方式a[]将其可视化，您的数组将如下所示：
8 2 6 5
6 3 1 0
8 7 9 6
Then to access the elements in the array, you have to provide the row number and the column number:
然后要访问数组中的元素，您必须提供行号和列号：
0 1 2 3
--------
0 | 8 2 6 5
1 | 6 3 1 0
2 | 8 7 9 6
So, for example, in row 0, column 3 is the number 5. In code this would look like a[0][3].
因此，例如，在第 0 行，第 3 列是数字 5。在代码中，这看起来像a[0][3]。
Technically speaking, a 2D array is actually an array of arrays, but it's often easier to think of it as a table.
从技术上讲，二维数组实际上是数组的数组，但通常更容易将其视为表格。
