初始化后可以初始化静态变量吗? [英] Can i initialize static variable after the initialization?
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问题描述
下面的代码有什么问题?
What is the problem with below code?
class test {
static int a;
a=10;
}
如果我是这样写的(如上所述),我会遇到编译时错误.
If I'm writing like this (as above), I'm getting a compile time error.
class test {
static int a=10;
a=4;
}
第二个,我没有任何错误.
For the second one, I'm not getting any error.
推荐答案
您的所有示例都不应编译.
Neither of your examples should compile.
a=10;
是一条语句,在类声明.您只能将以下内容直接放在类中:
is a statement, which is not valid directly inside a class declaration. You can only put the following directly inside a class:
- 成员声明(成员/静态变量声明(例如
static int a;
),方法,嵌套类和接口); - 静态和实例初始值设定项;
- 构造函数.
- Member declarations (member/static variable declarations (like
static int a;
), methods, nested classes and interfaces); - Static and instance initializers;
- Constructors.
您需要在块内放置一条语句,例如静态初始化程序:
You need to put a statement inside a block, for example a static initializer:
static int a;
static {
a = 10;
}
等效于:
static int a = 10;
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