java - ConcurrentHashMap 多线程获取数据时保证其他线程不会插入或者影响?

Question

ConcurrentHashMap 多线程获取数据时保证其他线程不会插入或者影响??

Answer 1

I don’t understand what the poster wants to ask.

Answer 2

Synchronize or use ThreadLocal

Answer 3

ConcurrentHashMap is thread-safe, whether it is put or get

Answer 4

What the poster wants to ask is whether ConcurrentHashMap will block the put operation when getting?

No
because the array of ConcurrentHashMap is declared like this: transient volatile Node<K,V>[] table;
The get operation just reads the current table array: tab = table. There is no lock.

So it will not block the put operation