In Java, the `java.util.WeakHashMap.keySet` is a method that returns a set view of the keys contained in the `WeakHashMap` instance. This set is backed by the `WeakHashMap`, so any changes made to the map will be reflected in the set, and vice versa. The set is weakly coherent, meaning that it reflects some but not all of the changes that have been made to the map since the set was created. Keys that are no longer in use and have been cleared by the garbage collector are automatically removed from both the map and the set.
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