Java中的同步块

Question

I came across the code:

synchronized(Account.this)   
{}   

where Account is a class.
Does Account.this mean any current instance of class Account?

Answer 1

This would probably be from an inner class of Account.

class Account {
  class InnerAccount {
    ...
    synchronized(Account.this) {
    }
  }
}

Answer 2

Normally it is used inside of an inner class: It means the this instance of the outer Account class.

Writing this by itself will return the instance of the inner class, not the outer class.