Client and backend. Every class listed here is shared: the same code is compiled into your app and into your server. The package's page in the client API lists all of it, including any classes that exist only in the app.
package java.lang.ref
Types
class Reference | Abstract base class for reference objects. |
class SoftReference | A reference the collector keeps while the referent is being used and memory allows, and clears before the process runs out. |
class WeakReference | This class provides support for weak references. |