JAVA的静态变量相当于类字段，而不用理解为对象字段。

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引言： JAVA的静态变量相当于类字段，而不用理解为对象字段。

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JAVA静态变量

java的静态变量相当于类字段,而不用理解为对象字段.

static fields and methods 【程序编程相关:认识String之二:String与St】

【推荐阅读:C# 静态成员和方法的学习小结】

in all sample programs that you have seen, the main method is tagged with the static modifier. we are now ready to discuss the meaning of this modifier. 【扩展信息:我在网上看到的,好站！】

static fields

if you define a field as static, then there is only one such field per class. in contrast, each object has its own copy of all instance fields. for example, let´s suppose we want to assign a unique identification number to each employee. we add an instance field id and a static field nextid to the employee class:

class employee

{

. . .

private int id;

private static int nextid = 1;

}

now, every employee object has its own id field, but there is only one nextid field that is shared among all instances of the class. let´s put it another way. if there are one thousand objects of the employee class, then there are one thousand instance fields id, one for each object. but there is a single static field nextid. even if there are no employee objects, the static field nextid is present. it belongs to the class, not to any individual object.

in most object-oriented programming languages, static fields are called class fields. the term "static" is a meaningless holdover from c++.

let´s implement a simple method:

public void setid()

{

id = nextid;

nextid++;

}

suppose you set the employee identification number for harry:

harry.setid();

then the id field of harry is set, and the value of the static field nextid is incremented:

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