Constructor synchronization in Java

Question

Someone somewhere told me that Java constructors are synchronized so that it can\'t be accessed concurrently during construction, and I was wondering: if I have a constructo

Answer 1

It's unsafe. There are no additional synchronization in JVM. You can do something like this:

public class Test {
    private final Object lock = new Object();
    public Test() {
        synchronized (lock) {
            // your improper object reference publication
            // long initialization
        }
    }

    public void doSomething() {
        synchronized (lock) {
            // do something
        }
    }
}