Can you explain what a weak reference means in memory management?

A weak reference is a reference to an object in memory that does not prevent the garbage collector from deleting that object if there are no strong references to it.

Weak references are useful in memory management when you want to hold a reference to an object but do not want to keep it in memory artificially. If the object is no longer needed elsewhere, it will be deleted, and the weak reference will become invalid.

For example, in Android, weak references are often used for caching or for references to a Context from long-lived objects to avoid memory leaks.

Example in Java:

WeakReference<MyObject> weakRef = new WeakReference<>(myObject);

// If myObject no longer has strong references, it can be deleted,
// and weakRef.get() will return null.