Feed Back OCPJP7

Today I failed the test for the first try.

The biggest problem comes from:

• Basic Java concepts from early chapters 1-3
• String processing
• IO & NIO & NIO2

Feedback on your performance is printed below. The report lists the objectives for which you answered a question incorrectly.

• Check, delete, copy, or move a file or directory with the Files class
• Construct abstract Java classes and subclasses
• Create and use List, Set and Deque implementations.
• Create top-level and nested classes
• Develop code that implements "is-a" and/or "has/a" relationships
• Develop code that uses try-with-resources statements (including using classes that implement the AutoCloseable interface)
• Find a file with the PathMatcher interface
• Format strings using the formatting parameters: %b, %c, %d, %f, and %s in format strings.
• Identify code that may not execute correctly in a multi-threaded environment.
• Identify when and how to apply abstract classes
• Load a resource bundle in an application
• Manage and control thread lifecycle
• Operate on file and directory paths with the Path class
• Overload constructors and other methods appropriately
• Override methods
• Read and write data from the console
• 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, [], ().
• Sort and search arrays and lists
• 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)
• Use streams to read from and write to files by using classes in the java.io package (including BufferedReader, BufferedWriter, File, FileReader, FileWriter, DataReader, ObjectOutputStream, ObjectInputStream, and PrintWriter)
• Use virtual method invocation
• Use wrapper classes, autoboxing and unboxing.
• Write code that declares, implements, and/or extends interfaces