Q1. What Design pattern Wrapper Classes implement ?
Ans. Adapter.
Q2. Difference between Proxy and Adapter ?
Ans. Adapter object has a different input than the real subject whereas Proxy object has the same input as the real subject. Proxy object is such that it should be placed as it is in place of the real subject.
Q3. Difference between Adapter and Facade ?
Ans. The Difference between these patterns in only the intent. Adapter is used because the objects in current form cannot communicate where as in Facade , though the objects can communicate , A Facade object is placed between the client and subject to simplify the interface.