synchronized

What is synchronized on Java?

1. Why is used? synchronized is lock for avoding race condition. 2. How do?1) functionex) public synchronized void setData(int data) {...} 2) blockex) public void setData(int data) { synchronized(this) { m_data = data; }} 3) valueex)private int m_data; public void setData(int data) { synchronized(m_data) { m_data = data; }} from: http://blog.naver.com/meelong0/140094191195