本地和实例对象创建时的java StackOverflowError

本文介绍了本地和实例对象创建时的java StackOverflowError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

谁能解释一下为什么这段代码片段给了我 StackOverflowError如果您能解释在 instanceObj 初始化和调用 ObjectTest 构造函数和 java.lang.Object 构造函数时发生了什么，我真的很感激.在我看来 ObjectTest 构造函数循环一遍又一遍.但我不知道确切的原因?所以任何建议...

Hi can anybody please explain me why is this code snippet giving me StackOverflowError I really appreciate if you can explain what is happening when instanceObj initializing and calling ObjectTest constructor and java.lang.Object constructor. It seems to me ObjectTest constructor loop over and over.But I don't know exact reason? So any suggestion...

public class ObjectTest { public ObjectTest() { } ObjectTest instanceObj = new ObjectTest(); public static void main(String[] args) { ObjectTest localObj = new ObjectTest(); } }

推荐答案

让我们看看会执行什么:

Let's see what will be executed :

main() 创建一个 ObjectTest

的新实例

ObjectTest 类有一个字段 instanceObj，它将包含一个 ObjectTest

使用新的 ObjectTest

初始化的 instanceObj

转到第 2 步

main() create a new instance of ObjectTest

the ObjectTest class has a field instanceObj which will contain an ObjectTest

the instanceObj in initialized with a new ObjectTest

go to step 2

我想你想要更像这样的东西:

I think you wanted something more like this :

public class ObjectTest { private static ObjectTest instanceObj; private ObjectTest() { } public static ObjectTest getInstance() { if (instanceObj != null) { instanceObj = new ObjectTest(); } return instanceObj; } public static void main(String[] args) { ObjectTest localObj = ObjectTest.getInstance(); } }

或者这个:

public class ObjectTest { private static final ObjectTest instanceObj = new ObjectTest(); private ObjectTest() { } public static ObjectTest getInstance() { return instanceObj; } public static void main(String[] args) { ObjectTest localObj = ObjectTest.getInstance(); } }

这是单例模式.

关于同一主题:

• 为什么我会收到 StackOverflowError
• Java 类中的循环依赖