创建本地和实例对象时出现java StackOverflowError

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您好，有人可以向我解释一下为什么此代码段给了我StackOverflowError 如果您能解释instanceObj初始化并调用ObjectTest构造函数和java.lang.Object构造函数时发生的情况，我将不胜感激.在我看来，ObjectTest构造函数会不断循环.但是我不知道确切的原因吗​​?所以有什么建议...

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

让我们看看将执行什么:

Let's see what will be executed :

main()创建ObjectTest

的新实例

ObjectTest类具有一个字段instanceObj，该字段将包含一个ObjectTest

instanceObj用新的ObjectTest

初始化

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

我认为您想要更多类似这样的东西:

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Singleton模式.

This is the Singleton pattern.

关于同一主题:

• 为什么会出现StackOverflowError
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• Why I'm getting StackOverflowError
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