Oracle 1Z0-804

Free Questions in OTE format

About Oracle 1Z0-804 dump

Java Class Design

• Use access modifiers: private, protected, and public
  
• Override methods
  
• Overload constructors and methods
  
• 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
  

Advanced Class Design

• 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
  

Object-Oriented Design Principles

• 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
  

Generics and Collections

• 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
  

String Processing

• 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.
  

Exceptions and Assertions

• 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
  

Java I/O Fundamentals

• 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
  

Java File I/O (NIO.2)

• 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
  

Building Database Applications with JDBC

• 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
  

Threads

• 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.
  

Concurrency

• 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
  

Localization

• 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