The java.util.WeakHashMap.containsKey method is used to determine if the WeakHashMap contains a mapping for a specified key. It returns true if the WeakHashMap contains the specified key, and false otherwise. The WeakHashMap class is similar to HashMap, but it allows its keys to be garbage-collected if they are no longer in use, making it useful in scenarios where memory efficiency is crucial. The containsKey method provides a convenient way to check if a particular key is present in the WeakHashMap.
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