Web Reference: Constructs a new WeakHashMap with the same mappings as the specified map. The WeakHashMap is created with the default load factor (0.75) and an initial capacity sufficient to hold the mappings in the specified map. 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... 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.
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