java

1. features

1.1. object oriented language

1.2. platform independant

1.3. Simple.

1.4. Secure.

1.5. architecture-neutral

1.6. Portable.

1.7. Multithreaded.

1.8. Robust.

2. Application

2.1. Mobile Applications.

2.2. Desktop GUI Applications.

2.3. Web-based Applications

2.4. Enterprise Applications.

2.5. Scientific Applications.

2.6. Gaming Applications

2.7. Big Data technologies

2.8. Business Applications.

3. operators

3.1. Relational Operators

3.2. Bitwise Operators

3.3. Logical Operators

3.4. Assignment Operators

3.5. Arithmetic Operators

3.6. Misc Operators

4. libraries

4.1. Logging Libraries

4.2. JSON Parsing libraries

4.3. Unit Testing Libraries

4.4. General Purpose Libraries

4.5. HTTP Libraries

4.6. XML Parsing Libraries

4.7. Excel Reading Libraries

4.8. Bytecode Libraries

4.9. Database Connection Pool Libraries

4.10. Messaging Libraries

4.11. PDF Libraries

4.12. Date and Time Libraries

4.13. Collection Libraries

4.14. Email APIs

4.14.1. Embedded SQL Database Library

4.15. . HTML Parsing Libraries

4.16. Cryptographic Library

4.17. JDBC Troubleshooting Libraries

4.18. Serialization Libraries

4.19. Networking Libraries

5. data taypes

5.1. primitive

5.1.1. Boolean

5.1.1.1. boolean

5.1.2. numeric

5.1.2.1. character

5.1.2.1.1. char

5.1.2.2. integeral

5.1.2.2.1. floating points

5.1.2.2.2. integer

5.2. non primitive

5.2.1. string

5.2.2. arry

5.2.3. etc