synchronizedMap « synchronize « Java Thread Q&A

1. Java synchronized block vs. Collections.synchronizedMap    stackoverflow.com

Is the following code set up to correctly synchronize the calls on synchronizedMap?

public class MyClass {
  private static Map<String, List<String>> synchronizedMap = Collections.synchronizedMap(new HashMap<String, List<String>>());

  public void doWork(String key) ...

2. Collection.synchronizedMap vs synchronizing individual methods in HashMap    stackoverflow.com

What is the difference between a Collections.synchronizedMap() and a wrapper around a HashMap with all the methods synchronized. I dont see any difference becuase Collections.synchronizedMap() internally maintains the same lock for ...

3. Is this usage of synchronizedMap thread safe?    stackoverflow.com

I have a singleton class, that has a map which can be accessed by multiple threads at the same time. Could somebody please check the code below and tell me if ...

4. Java Collections.synchronizedMap() with complex type definition    stackoverflow.com

Suppose I have a class of the sort:

public class MyMap<K, V> implements Map<Set<K>, V> {
  ...
}

5. object created by synchronizedMap(new HashMap()) needs synchronize block or not    coderanch.com

Hi, If we are creating a Map like Map m = Collections.synchronizedMap(new HashMap()); whether m should be synchronized if there is possiblity of two or more threads can update the map. In the API they have synchronized m value with the below lines eventhough they created that from synchronizedMap synchronized(m) { // Synchronizing on m, not s! Iterator i = s.iterator(); ...

6. Synchronized TreeMap without Collections.synchronizedMap(new TreeMap())    forums.oracle.com