为什么我在构造函数中收到StackOverflowError异常

问题描述

public class Cloning {

    Cloning c=new Cloning();
    public static void main(String[] args) {

        Cloning c=new Cloning();
        c.print();
    }

    public void print(){
        System.out.println("I am in print");
    }

}

在上面的代码我有一个简单类和类级实例，我也有一个同名的本地实例。运行上面的代码时，我得到以下异常：

In the above code I have a simple class and a class level instance, I also have a local instance with the same name. When running the above code I get below exception :

Exception in thread "main" java.lang.StackOverflowError
    at com.java8.Cloning.<init>(Cloning.java:6)

推荐答案

你的main方法创建一个克隆实例（克隆c = new Cloning（）; ），这会导致实例变量的初始化 c （ Cloning c = new Cloning（）; ），这会创建另一个克隆实例，依此类推......

Your main method creates a Cloning instance (Cloning c=new Cloning();), which causes the initialization of the instance variable c (Cloning c=new Cloning();), which creates another Cloning instance, and so on...

你有一个无限的构造函数调用链，导致 StackOverflowError 。

You have an infinite chain of constructor calls, which leads to StackOverflowError.

您没有类级实例。您有一个实例级实例。如果你想要一个类级实例，请更改

You don't have a class level instance. You have an instance level instance. If you want a class level instance, change

Cloning c=new Cloning();

到

static Cloning c=new Cloning();

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