thread intrinsic lock

The lock is part of the Object. Every Object has one and it may be locked in two ways:

1. Using the synchronized modifier on an instance method of the Class to lock the associated object
2. Using a synchronized(object) {} block

Similarly, you can lock the Class of an Object instead of the Object itself (bares mentioning separately to understand the synchronized modifier with a static method):

1. Using the synchronized modifier on a static method of the Class to lock the Class
2. Using a synchronized(clazz) {} block where clazz is the Class of the Object