java7併發編程學習筆記

1.java線程狀態

A thread state. A thread can be in one of the following states:

• NEW
  A thread that has not yet started is in this state.
• RUNNABLE
  A thread executing in the Java virtual machine is in this state.
• BLOCKED
  A thread that is blocked waiting for a monitor lock is in this state.
• WAITING
  A thread that is waiting indefinitely for another thread to perform a particular action is in this state.
• TIMED_WAITING
  A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state.
• TERMINATED
  A thread that has exited is in this state.

A thread can be in only one state at a given point in time. These states are virtual machine states which do not reflect any operating system thread states.

2.Thread.interrupted()靜態方法檢查當前線程是否中斷，並清除中斷狀態。  Thread實例的isInterrupted()方法只返回線程中斷狀態，推薦使用。

3.sleep()方法線程不會釋放對象鎖，wait()方法線程會放棄對象鎖。

4.兩種同步機制：synchronized關鍵字 和  Lock接口