Java多线程 同步 对象锁
多线程、同步:
https://www.cnblogs.com/GarfieldEr007/p/5746362.html
Java对象锁和类锁全面解析(多线程synchronized关键字):
http://blog.csdn.net/u013142781/article/details/51697672
Java Object对象中的wait,notify,notifyAll通俗理解
http://blog.csdn.net/vk5176891/article/details/53945677