Use access modifiers: private, protected, and public
Override methods
Overload constructors and other methods appropriately
Use the instance of operator and casting
Use virtual method invOCPtion
Override methods from the Object class to improve the functionality of your class
Override methods from the Object class to improve the functionality of your class

Identify when and how to apply abstract classes
Construct abstract Java classes and subclasses
Use the static and final keywords
Create top-level and nested classes
Use enumerated types

Write code that declares, implements and/or extends interfaces
Choose between interface inheritance and class inheritance
Develop code that implements "is-a" and/or "has-a" relationships.
Apply object composition principles
Design a class using the Singleton design pattern
Write code to implement the DAO pattern
Design and create objects using a factory, and use factories from the API

Create a generic class
Use the diamond syntax to create a collection
Analyze the interoperability of collections that use raw type and generic types
Use wrapper classes and autoboxing
Create and use a List, a Set and a Deque
Create and use a Map
Use java.util.Comparator and java.lang.Comparable
Sort and search arrays and lists

Search, parse and build strings
Search, parse, and replace strings by using regular expressions
Use string formatting

Use throw and throws statements
Use the try statement with multi-catch, and finally clauses
Autoclose resources with a try-with-resources statement
Create custom exceptions
Test invariants by using assertions

Read and write data from the console
Use streams to read and write files

Use the Path class to operate on file and directory paths
Use the Files class to check, delete, copy, or move a file or directory
Read and change file and directory attributes
Recursively access a directory tree
Find a file by using the PathMatcher class
Watch a directory for changes by using WatchService

Define the layout of the JDBC API
Connect to a database by using a JDBC driver
Update and query a database
Customize the transaction behavior of JDBC and commit transactions
Use the JDBC 4.1 RowSetProvider, RowSetFactory, and RowSet interfaces

Create and use the Thread class and the Runnable interface
Manage and control thread lifecycle
Synchronize thread access to shared data
Identify potential threading problems

Use java.util.concurrent collections
Apply atomic variables and locks
Use Executors and ThreadPools
Use the parallel Fork/Join Framework

Read and set the lOCPle by using the LOCPle object
Build a resource bundle for each lOCPle
Load a resource bundle in an application
Format text for localization by using NumberFormat and DateFormat