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发表于: java/j2ee | 作者: | 日期: 2013/12/13 10:12

类变量也叫静态变量,也就是在变量前加了static 的变量;
实例变量也叫对象变量,即没加static 的变量;
区别在于:
类变量和实例变量的区别在于:类变量是所有对象共有,其中一个对象将它值改变,其他对象得到的就是改变后的结果;而实例变量则属对象私有,某一个对象将其值改变,不影响其他对象;
例:

public class A{
static int a = 0; //类变量
private int b = 0; //实力变量
}
public class B{
public void main (String[] args){
A a1 = new A();
A a2 = new A();
a1.a = 3; // 等同于 A.a = 3;
a1.b = 4 ;
System.out.println(a2.a); //结果为3
//类变量是针对所有对象的,所以a1改变a,a2的a也改变
System.out.println(a2.b); //结果为0
//实例只改变自身的,所以a1对象的b改变,不影响对象a2的b变量
}
}

[整理自网络]

: https://blog.darkmi.com/2013/12/13/3472.html


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