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Code examples, resources, and notes covering the ocjp8 1Z0-813 exam.

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# ocjp8-1z0-813
Code examples, resources, and notes covering the ocjp8 1Z0-813 exam.

Exam Number: 1Z0-813

Exam Title: Upgrade to Java SE 8 OCP ( Java SE 6 and all prior versions)

# Exam Topics

#### 1. Language Enhancements

* Develop code that uses String objects in the switch statement, binary literals, and numeric literals, including underscores in literals
* Develop code that uses try-with-resources statements, including using classes that implement the AutoCloseable interface
* Develop code that handles multiple Exception types in a single catch block
* Use static and default methods of an interface including inheritance rules for a default method

#### 2. Concurrency

* Use classes from the java.util.concurrent package including CyclicBarrier and CopyOnWriteArrayList 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 and java.util.concurrent.atomic packages 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

#### 3. Localization

* Describe the advantages of localizing an application and developing code that defines, reads, and sets the locale with a Locale object
* Build a resource bundle for a locale and call a resource bundle from an application
* Create and manage date- and time-based events by using LocalDate, LocalTime, LocalDateTime, Instant, Period, and Duration, including a combination of date and time in a single object
* Format dates, numbers, and currency values for localization with the NumberFormat and DateFormat classes, including number and date format patterns
* Work with dates and times across time zones and manage changes resulting from daylight savings

#### 4. Java File I/O (NIO.2)

* Operate on file and directory paths by using the Paths class
* Check, delete, copy, or move a file or directory by using the Files class 
* Recursively access a directory tree by using the DirectoryStream and FileVisitor interfaces
* Find a file by using the PathMatcher interface, and use Java SE 8 I/O improvements, including Files.find(), Files.walk(), and lines() methods
* Observe the changes in a directory by using the WatchService interface

#### 5. Lambda

* Define and write functional interfaces and describe the interfaces of the java.util.function package
* Describe a lambda expression; refactor the code that uses an anonymous inner class to use a lambda expression; describe type inference and target typing
* Develop code that uses the built-in interfaces included in the java.util.function package, such as Function, Consumer, Supplier, UnaryOperator, Predicate, and Optional APIs, including the primitive and binary variations of the interfaces
* Develop code that uses a method reference, including refactoring a lambda expression to a method reference

#### 6. Java Collections

* Develop code that uses diamond with generic declarations
* Develop code that iterates a collection, filters a collection, and sorts a collection by using lambda expressions
* Search for data by using methods, such as findFirst(), findAny(), anyMatch(), allMatch(), and noneMatch()
* Perform calculations on Java Streams by using count, max, min, average, and sum methods and save results to a collection by using the collect method and Collector class, including the averagingDouble, groupingBy, joining, partitioningBy methods
* Develop code that uses Java SE 8 collection improvements, including the Collection.removeIf(), List.replaceAll(), Map.computeIfAbsent(), and Map.computeIfPresent() methods
* Develop  code that uses the merge(), flatMap(), and map() methods on Java Streams

#### 7. Java Streams

* Describe the Stream interface and pipelines; create a stream by using the Arrays.stream() and  IntStream.range() methods; identify the lambda operations that are lazy
* Develop code that uses parallel streams, including decomposition operation and reduction operation in streams

# Links

* https://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=5001&get_params=p_exam_id:1Z0-813
* http://ocpj8.javastudyguide.com/upgrade.html#java6
* http://java.boot.by/ocpjp8-upgrade-guide/
* http://enthuware.com/index.php/mock-exams/oracle-certified-professional/ocpjp-8-1z0-813-questions

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