The java.util.list is not thread safe by default. There can be situations where you would want to use the list in a multithreaded environment for processing.
An effective mechanism is to use Collections.synchronizedList(ordinaryList) where ordinaryList is a normal list. The return value of this invocation is a thread safe list which can be used as desired.
// Creating a safeList that will be thread safe
List safeList = Collections.synchronizedList(ordinaryList);
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