Java (Must know)

This is a list of Must-know in Java that I made with the help of my instructor. 

As always, step by step, we will get there! 

1. Data types
2. Variables (regional variable, member variable, static variable)
3. Operators
4. Control statement (condition statement, repeat statement)
   Auxiliary control statement (break, continue)
5. Call Methods
   (Call by Value, Call by Reference)
6. Arrays
7. classes, objects, constructors, methods
8. Access Controllers
9. Date, Timestamp, Calendar
10. String-related classes (String, StringBuffer, StringTokenizer)
11. Inheritance
    (Member variable, method, constructor)
12. Abstract classes, interface
13. Collection, Generic
    List, Map
14. Transform data type
    1. Basic data type conversion ex) double <---> int
    2. Data type conversion using a wrapper (basic data type <---> reference type)
       ex) int <---> String Wrapper Class (Boxing and Unboxing)
       int n = Integer.parseInt("20");
    3. Reference Type Transformation
15. Exception handling
16. Thread
17. java.io.* (BufferedReader, FileReader, FileWriter, File)
18. java.net.* (Socket Communications)
19. java.sql.* (Database interlocking)