在构造函数中使用synchronized块有什么用？ [英] What is the use of synchronized block inside constructor?

问题描述

我们不能使构造函数 synchronized 但是可以在内部构造函数中编写 synchronized 。在什么情况下这样的要求会来？
我很开心。

We can not make constructor synchronized but can write synchronized this inside constructor. In what case such requirement will come ? I am amused.

package com.simple;
public class Test {
    public Test() {
        synchronized (this) {
            System.out.println("I am called ...");
        }
    }

    public static void main(String[] args) {
        Test test=new Test();   
        System.out.println(""+test);
    }

    @Override
    public String toString() {
        return "Test []";
    }
}

推荐答案

好，你可以在构造函数中启动一个新线程。这将是非常不寻常的 - 当然在您提供的代码中它将毫无意义 - 但它可能会发生。

Well, you could start a new thread within the constructor. It would be highly unusual - and certainly in the code you've provided it would be pointless - but it could happen.

语言通常不会尝试找到所有可能的你可以做的事情毫无意义 - 它会导致非常复杂的语言规范。语言用户也必须有一定程度的思考......

Languages don't typically try to find every possibly thing you could do that would be pointless - it would lead to a very complex language specification. There has to be some degree of thought on the part of the language users, too...

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