Web Reference: Creates a new, empty WeakHashMap suitable for the expected number of mappings. The returned map uses the default load factor of 0.75, and its initial capacity is generally large enough so that the expected number of mappings can be added without resizing the map. Mar 17, 2026 · WeakHashMap is a part of the java.util package that implements the Map interface. It stores key–value pairs like a HashMap but allows keys to be garbage-collected when they are no longer in ordinary use. In this article, we will be looking at a WeakHashMap from the java.util package. In order to understand the data structure, we’ll use it here to roll out a simple cache implementation. However, keep in mind that this is meant to understand how the map works, and creating your own cache implementation is almost always a bad idea. Simply put, the Wea...
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