Java Object Lock-synchronized () and the state and life cycle of the thread

Synchronized (someobject) {//Object lock}

Instructions for using object locks:

1, the return of the object lock.

When the Synchronize () statement finishes executing.

An exception occurred when the Synchronize () statement was executed.

When the thread calls the Wait () method.

2. Data that is protected with object locks must be private.

3, the object lock has the reentrant nature.

A thread can request an object lock again if it has acquired an object lock.

4, the life cycle of the thread

Java Object Lock-synchronized () and the state and life cycle of the thread