Synchronized Block within Synchronized Method

Question

I\'m looking at some code in a third party library that contains a synchronized method, and within this method there is a synchronized block that locks on an instance variab

Answer 1

I will give a real life example to explain what Andy explained through code(to those who are finding it difficult to understand this):

Suppose You have a 1 BHK Flat .

1. The way to enter in room is through hall (you have to first enter into hall to enter into room)
2. You want to restrict some one to use you room , but he can use/enter in the hall.

In this case if someone enters into room from back door and applies lock from inside. One can only enter into the hall and cant enter into the room until the person inside the room releases the lock .

Hope this clarifies to the people who are finding it difficult to understand this.