java中的静态方法 [英] Static method in java

问题描述

我听说静态方法应该只在java中使用静态变量。
但是，main方法也是静态的，对吧？

I heard that static methods should use only static variables in java. But, main method is also static, right?

推荐答案

您的问题：声明静态方法应该只使用静态变量是否正确？

Your question: is the statement " static methods should use only static variables" correct?

没有。该陈述不正确。

正确的陈述将是静态方法只能使用那些定义为静态的实例变量

The correct statement will be "static methods can only use those instance variables that are defined static"

查看以下代码并阅读评论：

Take a look at following code and read the comments:

Class A{
    int i;
    static int j;

    public static void methodA(){
        i = 5; //cannot use since i is not static
        j = 2; //can use.

        int k = 3; //k is local variable and can be used no problem

        **EDIT:**//if you want to access i
        A a = new A();
        //A.i = 5; //can use.  
        a.i = 5; // it should be non-capital "a" right?
    }
}

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