枚举单例如何运作？ [英] How does an enum singleton function?

问题描述

以前不用使用枚举，我会做一些类似的例子：

Previously instead of using enums, I would do something like:

public static ExampleClass instance;

public ExampleClass(){
    instance=this;
}

public static ExampleClass getInstance(){
    return instance;
}

然后有人告诉我一个枚举单身人士：

Then someone told me about a enum singleton:

 public enum Example{
 INSTANCE;

 public static Example getInstance(){
      return Example.INSTANCE;
 }

在第一个例子中，我不得不实例化对象以创建实例。有一个枚举，我不需要这样做..至少它出现。有人可以解释这个原因吗？

In the first example I had to instantiate the object in order to create the instance. With an enum, I do not need to do that.. at least it appears. Can someone explain the reason behind this?

推荐答案

Java编译器负责将枚举字段创建为Java类的静态实例字节码。伟大的博客文章（不是我的博客）与字节码在这里： http：// boyns。 blogspot.com/2008/03/java-15-explained-enum.html

The Java compiler takes care of creating enum fields as static instances of a Java class in bytecode. Great blog post on it (not my blog) with bytecode here: http://boyns.blogspot.com/2008/03/java-15-explained-enum.html

这篇关于枚举单例如何运作？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！