OCPJSE7 – wstęp do serii

Seria OCPJSE7 – jest kopią wpisów z mojego pierwszego podejścia do blogowania. W2016 roku, kilka miesięcy po tym jak zdałem egzamin 1Z0-804 (Oracle Certified Proffesional Java SE7), postanowiłem utrwalić swoją wiedzę poprzez napisanie serii artykułów. Planowałem po jednym wpisie na każde z 63 zagadnień będących przedmiotem egzaminu.

Jednak w międzyczasie zmieniłem pracodawcę, pojawiły się nowe wyzwania zawodowe, a blog poszedł w odstawkę.

Teraz, kiedy zapragnąłem na nowo spróbować swoich sił w blogowaniu, skopiowałem na tego bloga 14 dość obszernych wpisów, które zdążyłem wtedy stworzyć.

Na ten moment nie planuję wznowić serii, ale w przyszłości, jeśli blog przetrwa próbę „pierwszego roku”. Zobaczymy… 🙂

W trakcie kopiowania starałem się podmienić wszystkie referencje do starego bloga, jednak może się zdarzyć, że gdzieś zawieruszył się stary adres – javathehat.com, zwłaszcza w przykładach kodu.

• Use access modifiers: private, protected, and public
• Override methods
• Overload constructors and method
• Use the instanceof operator and casting
• Use virtual method invocation
• Override the hashCode, equals, and toString methods from the Object class to improve the functionality of your class.
• Use package and import statements.

• 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
• Apply cohesion, low-coupling, IS-A, and HAS-A principles
• Apply object composition principles (including has-a relationships)
• Design a class using a Singleton design pattern
• Write code to implement the Data Access Object (DAO) pattern
• Design and create objects using a factory pattern

• Create a generic class
• Use the diamond for type inference
• Analyze the interoperability of collections that use raw types and generic types
• Use wrapper classes, autoboxing and unboxing
• Create and use List, Set and Deque implementations
• Create and use Map implementations
• Use java.util.Comparator and java.lang.Comparable
• Sort and search arrays and lists

• Search, parse and build strings (including Scanner, StringTokenizer, StringBuilder, String and Formatter)
• Search, parse, and replace strings by using regular expressions, using expression patterns for matching limited to: . (dot), * (star), + (plus), ?, \d, \D, \s, \S, \w, \W, \b. \B, [], ().
• Format strings using the formatting parameters: %b, %c, %d, %f, and %s in format strings.

• Use throw and throws statements
• Develop code that handles multiple Exception types in a single catch block
• Develop code that uses try-with-resources statements (including using classes that implement the AutoCloseable interface)
• Create custom exceptions
• Test invariants by using assertions

• Read and write data from the console
• Use streams to read from and write to files by using classes in the java.io package including BufferedReader, BufferedWriter, File, FileReader, FileWriter, DataInputStream, DataOutputStream, ObjectOutputStream, ObjectInputStream, and PrintWriter

• Operate on file and directory paths with the Path class
• Check, delete, copy, or move a file or directory with the Files class
• Read and change file and directory attributes, focusing on the BasicFileAttributes, DosFileAttributes, and PosixFileAttributes interfaces
• Recursively access a directory tree using the DirectoryStream and FileVisitor interfaces
• Find a file with the PathMatcher interface
• Watch a directory for changes with the WatchService interface

• Describe the interfaces that make up the core of the JDBC API (including the Driver, Connection, Statement, and ResultSet interfaces and their relationship to provider implementations)
• Identify the components required to connect to a database using the DriverManager class (including the jdbc URL)
• Submit queries and read results from the database (including creating statements, returning result sets, iterating through the results, and properly closing result sets, statements, and connections)
• Use JDBC transactions (including disabling auto-commit mode, committing and rolling back transactions, and setting and rolling back to savepoints)
• Construct and use RowSet objects using the RowSetProvider class and the RowSetFactory interface
• Create and use PreparedStatement and CallableStatement objects

• Create and use the Thread class and the Runnable interface
• Manage and control thread lifecycle
• Synchronize thread access to shared data
• Identify code that may not execute correctly in a multi-threaded environment.

• Use collections from the java.util.concurrent package with a focus on the advantages over and differences from the traditional java.util collections.
• Use Lock, ReadWriteLock, and ReentrantLock classes in the java.util.concurrent.locks package to support lock-free thread-safe programming on single variables.
• Use Executor, ExecutorService, Executors, Callable, and Future to execute tasks using thread pools.
• Use the parallel Fork/Join Framework

• Read and set the locale by using the Locale object
• Build a resource bundle for each locale
• Call a resource bundle from an application
• Format dates, numbers, and currency values for localization with the NumberFormat and DateFormat classes (including number format patterns)
• Describe the advantages of localizing an application
• Define a locale using language and country codes