Why can't Java constructors be synchronized?

Question

According to the Java Language Specification, constructors cannot be marked synchronized because other threads cannot see the object being created until the thread creating

Answer 1

Such a synchronization might make sense in some very rare cases, but I guess, it's just not worth it:

• you can always use a synchronized block instead
• it'd support coding in a pretty strange way
• on what should it synchronize? A constructor is a sort-of static method, it works on an object but gets called without it. So synchronizing on the class also makes (some) sense!

When in doubt, leave it out.