Synchronize access to HashMap from two threads in java
android, collections, java, multithreading, synchronized
Solution
Yes. But also you can use Collections.synchronizedMap utility method to make a hashmap thread safe:
Map yourMap = new HashMap();
Map synchronizedMap = java.util.Collections.synchronizedMap(yourMap);
Or you can use ConcurrentHashMap or Hashtable which are thread safe by default.
Problem
I have two threads running ( One is Main Thread(Say `Thread1`) and another one is background thread (say `Thread2`)). I can access `HashMap` variable `hashMap` from `Thread1` and `Thread2`. `Thread1` modifies the `hashMap` and Thread2 reads the HashMap. In `Thread1` code will be: ``` synchronized(hashMap){ //updating hashMap } ``` In Thread2 code will be: ``` synchronized(hashMap){ //reading hashMap } ``` Can I synchronize the access to `hashMap` using `synchronized block` in this way?