This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Jothi, Hashtable and Vector has the methods which are syncronized and are thread safe. Syncronized collections can be made through the utility methods in Collections class from the existing collection.
there are methods in java.util.Collections that return a thread safe collection from a non thread safe one. All these methods names start with "synchronized". e.g. List<Double> list = new ArrayList<Double>(); List<Double> safe; safe = Collections.synchronizedList(list);