When a Java program starts up, several system threads are also started ... Is this why all Java c

[Casey Hawthorne]

When a Java program starts up, several system threads are also started
without the programmer necessarily knowing about them.

Is this why all Java classes have extra synchronization overhead
associated with them even if you are not using threads in your own
program?

 

[Robert Klemme]

When a Java program starts up, several system threads are also started
without the programmer necessarily knowing about them.
Right.

Is this why all Java classes have extra synchronization overhead
associated with them even if you are not using threads in your own
program?

I do not know what you are referring to here. There are certainly some
operations that need to be performed in a thread safe manner (i.e.
loading of a class by a class loader). But normal instance and class
methods do not suffer extra synchronization overhead unless you
explicitly state so. (That would be quite inefficient btw.)

Kind regards

robert