Java 静态数组
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Java-static arrays
提问by Ruba
i have a class called (User) and i want to make a multidimensional array of it i have wrote
我有一个名为 (User) 的类，我想为其编写一个多维数组
static User [][] userlist=new User[6][];
and i have a compiler error that is : illegal start of expression
我有一个编译器错误：非法的表达式开始
thanks a lot .
多谢 。
采纳答案by Mark Peters
Here's an example of a 5x5 2-dimensional array:
下面是一个 5x5 二维数组的例子：
private static int[][] matrix = new int[5][5];
//set index 1, 2 to 5
matrix[1][2] = 5;
The static part really makes no difference; just declare the member as static.
静态部分真的没有区别；只需将成员声明为静态。
回答by Jigar Joshi
static int[][] arr = new int[2][4] ;
arr[0][0]=1;
arr[0][1]=2;
.
.
arr[0][3]=4;
回答by Peter Lawrey
Similar to @Mark solution, you can initialise a multi-dimensional array
类似于@Mark的解决方案，可以初始化一个多维数组
private static int[][] matrix = {
{ 1,2,3,4,5 },
{ 6,7,8,9,10 }
};
回答by Peter Lawrey
There are a number of nice answers, so this is more informative than anything:
有很多不错的答案，所以这比任何事情都提供更多信息：
The problem is that all dimensions mustbe specified explicitly or implicitly -- and the new X[..][..][..]etc, (explicitly specified dimensions) form requires that each dimension (..) is a (non-negative) integer expression. The javac compiler is throwing that error because it found the last ]but was expecting an integer expression.
问题是必须显式或隐式指定所有维度——new X[..][..][..]等（显式指定维度）形式要求每个维度 ( ..) 是（非负）整数表达式。javac 编译器抛出该错误，因为它找到了最后一个]但期望一个整数表达式。
new User[6][/*you need an integer expression here*/];
Happy coding.
快乐编码。
