When your app starts, it allocates memory to objects (reference types) in runtime. This is your memory heap (don’t confuse it with stack) assigned to your app. Still don’t get it? Ok, so let me explain this using some pictures and a simplified example. Implement thread.The Garbage Collection process, also known as automatic memory management, is the automatic recycling of dynamically allocated memory, as explained here.
Data Science vs Big Data vs Data Analytics. This makes them an excellent foundation for a cache, such as the image cache described above, since you can let the garbage collector worry about both how reachable the objects are (a strongly reachable object will never be removed from the cache) and how badly it needs the memory they are consuming. SoftReferences aren't required to behave any differently than WeakReferences, but in practice softly reachable objects are generally retained as long as memory is in plentiful supply. An object which is only weakly reachable (the strongest references to it are WeakReferences) will be discarded at the next garbage collection cycle, but an object which is softly reachable will generally stick around for a while. Of course the weak reference isn't strong enough to prevent garbage collection, so you may find (if there are no strong references to the widget) that weakWidget.get() suddenly starts returning null.Ī soft reference is exactly like a weak reference, except that it is less eager to throw away the object to which it refers. You create a weak reference like this: WeakReference weakWidget = new WeakReference ( widget ) Īnd then elsewhere in the code you can use weakWidget.get() to get the actual Widget object. Weak references allow you to leverage the garbage collector's ability to determine reachability for you, so you don't have to do it yourself. 
A weak reference, simply put, is a reference that isn't strong enough to force an object to remain in memory.
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