Do not let multithreading HashMap, otherwise there will be (think multithreading array or list what will occur): loss of data, infinite loop, throw an exception! ! !
Multi-threaded recommended ConcurrentHashMap
Do not let multithreading HashMap, otherwise there will be (think multithreading array or list what will occur): loss of data, infinite loop, throw an exception! ! !
Multi-threaded recommended ConcurrentHashMap