Java 用布尔值填充二维数组
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Fill two-dimensional array with boolean value
提问by Damian
In my class I have these properties:
在我的课堂上，我有这些属性：
boolean rendered[][] = new boolean[][]{};
String tabs[] = { "Tab 1", "Tab 2" };
int rows = 10;
... and I want to create an array with two main levels (two elements in tabsarray), and each level would have 10 (variable rows) elements with falsevalue.
...并且我想创建一个具有两个主要级别（tabs数组中的两个元素）的数组，每个级别将有 10 个（变量rows）具有false值的元素。
回答by arynaq
You are free to think of it as [row][column] or [column][row] but the former has a history of usage.
您可以自由地将其视为 [row][column] 或 [column][row]，但前者有使用历史。
int rows = 10, int columns = 2
boolean rendered[][] = new boolean[rows][columns];
java.util.Arrays.fill(rendered[0], false);
java.util.Arrays.fill(rendered[1], false);
回答by chrylis -cautiouslyoptimistic-
You probably want Arrays#fill:
你可能想要Arrays#fill：
boolean rendered[][] = new boolean[rows][columns]; // you have to specify the size here
for(boolean row[]: rendered)
Arrays.fill(row, false);
(Arrays#fillcan only work on a one-dimensional array, so you'll have to iterate over the rest of the dimensions in a forloop yourself.)
（Arrays#fill只能处理一维数组，因此您必须自己在循环中迭代其余维度for。）
回答by Christopher Francisco
First, you should tell the compiler how long is your array:
首先，你应该告诉编译器你的数组有多长：
boolean rendered[][] = new Boolean[4][5];
Then you can proceed filling it
然后就可以继续填了
for(int i = 0; i < rendered.length; i++)
for(int j = 0; j < rendered[i].length; j++)
rendered[i][j] = false;
