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i need a thread safe map, i have something like this: (i'm very new to java)
public static class Manager { static { //something wrong here, doesn't compile list = new java.util.Collections .synchronizedMap(new Map<String, Client>()); } static Map<String,Client> list; public static void AddClient(Client client) { // thread safe add client to the list } public static void RemoveClient(Client client) { // thread safe remove client to the list } } 
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Java HashMap is not thread-safe and hence it should not be used in multithreaded applications.
TreeMap and TreeSet are not thread-safe collections, so care must be taken to ensure when used in multi-threaded programs. Both TreeMap and TreeSet are safe when read, even concurrently, by multiple threads.
You can make HashMap thread safe by wrapping it with Collections. synchronizedMap() . What's the difference? @naXa ConcurrentHashMap allows concurrent access and a synchronized one doesn't.
HashMap performance is relatively high because it is non-synchronized in nature and any number of threads can perform simultaneously. But ConcurrentHashMap performance is low sometimes because sometimes Threads are required to wait on ConcurrentHashMap.
java.util.concurrent.ConcurrentHashMap
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