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While learning Java, I have made a small language reference, just to have everything on one place and to have something for doing experiments :).
Who knows, maybe this 'small' reference will help someone else searching for java basics answers.
The reference contains:
1. Java - Primitives
2. Java - Strings
3. Java - Arrays
4. Java - Date
5. Java - Generics
6. Java - Collections
7. Java - Localization
8. Java - Formatting
9. Java - Regular Expressions
10. Java - System
11. Java - Serialization
12. Java - Multithreading
13. Java - IO/File
14. Java - Networking
15. Java - ORM - JPA
a) Simple User entity class