The Java programming language's Java Collections Framework version 1.5 and later defines and implements the original regular single-threaded maps, and also new thread-safe maps implementing the java.util.concurrent.ConcurrentMap interface among other concurrent interfaces. In Java 1.6, the java.util.NavigableMap interface was added, extending java.util.SortedMap, and the java.util.concurrent.ConcurrentNavigableMap interface was added as a subinterface combination.
The Java programming language's Java Collections Framework version 1.5 and later defines and implements the original regular single-threaded maps, and also new thread-safe maps implementing the java.util.concurrent.ConcurrentMap interface among other concurrent interfaces. In Java 1.6, the java.util.NavigableMap interface was added, extending java.util.SortedMap, and the java.util.concurrent.ConcurrentNavigableMap interface was added as a subinterface combination.
Source: Wikipedia "Java ConcurrentMap" · CC BY-SA 4.0
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