Optimizing Java Code with WeakHashMap: Learn How to Manage Memory Efficiently | Quick and Easy Guide

A WeakHashMap in Java is a special implementation of the Map interface that stores keys using weak references. This means that an entry in a WeakHashMap can be garbage collected if there are no strong references to the key object. WeakHashMap is useful for implementing caches or storing metadata associated with objects, where you don't want the map to prevent garbage collection of the keys.

Create an instance of a WeakHashMap with key-value types.
Use the put() method to insert key-value pairs into the WeakHashMap.
Use the get() method to retrieve the value associated with a key.

In this example, we create a WeakHashMap with String keys and Integer values, add a key-value pair, retrieve the value associated with the key, and demonstrate that the entry can be garbage collected when there are no strong references to the key. Note that the exact behavior of garbage collection depends on the JVM and cannot be guaranteed.