初始化后可以初始化静态变量吗? [英] Can i initialize static variable after the initialization?

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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