如何从Java中的静态方法访问非静态成员?

本文介绍了如何从Java中的静态方法访问非静态成员?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一种情况，我必须从静态方法内部访问非静态成员.我可以使用新实例访问它，但是当前状态将丢失，因为非静态成员将被重新初始化.如何在不丢失数据的情况下实现这一目标?

I have a situation where i have to access a non static member from inside a static method. I can access it with new instance, but current state will be lost as non static member will be re-initialized. How to achieve this without losing data?

推荐答案

也许您想要单人.然后，您可以从静态方法中获取该类的(唯一)实例并访问其成员.

Maybe you want a singleton. Then you could get the (only) instance of the class from within a static method and access its members.

基本思想是

public class Singleton { private static Singleton instance = null; private Singleton() {} public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } return instance; } }

，然后使用某些静态方法:

and then in some static method:

public static someMethod() { Singleton s = Singleton.getInstance(); //do something with s }