Question

I have a class which looks something like this:

public class Test {  private static final Object someObject = new Object();  public void doSomething() {     synchronized (someObject) {         System.out.println(someObject.toString());     } }  } 

Can I consider the object to be synchronized, or is there a problem since it is a static member?

Edit: note that different threads might be accessing doSomething() and the object must be accessed in a thread-safe manner in that case.

Answer 1

By using a static object as your monitor object, only one thread using ANY instance of the Test class can get into the sync block. If the monitor object was not a static object, other threads holding different instances of the Test class could get into the sync block.