Given that this exam is at the professional level of certification, candidates have a large amount of work to do. Therefore, the first thing that is recommended is to thoroughly review the complete list of topics available on the official exam page, which includes:

Exceptions and Assertions. In other words, how to use try-catch and throw statements, alongside creating custom exceptions and Auto-closeable resources.
Stream API. It means the code development that uses optional class, Stream data, and calculation methods in addition to sorting a collection using Stream API.
NIO.2, Path Interface, and Files Class.
Java Concurrency. The candidates must be able to create worker threads, as well as to use parallel Fork/Join Framework and parallel Streams.
Advanced Class Design. Specifically, candidates must demonstrate skills in how to implement encapsulation, polymorphism, and inheritance.
I/O Fundamentals. It means the skill of reading and writing data from the console.
Generics and Collections. This allows the candidate to create and use a generic class as well as ArrayList, TreeSet, TreeMap, and ArrayDeque objects.
Localization. In particular how to read and set the locale by using the Locale object, to create and read a Properties file, and to build a recourse bundle for each locale.

To apply for this Oracle certification test, you should first pay $245 for a voucher. After that, go to Pearson VUE and log into your account. Enter the exam code, which should be 1Z0-809, and follow the instructions that will pop up.

Reference: https://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=5001&get_params=p_exam_id:1Z0-809

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The price of the 1Z0-809 exam is $245 USD.

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The Oracle 1Z0-809 exam is intended for those individuals who want to get the Oracle Certified Professional, Java SE 8 Programmer certification. The potential candidates for this test are those IT specialists who have some years of experience with Java SE 8 platform and hold the Oracle Certified Associate, Java SE 8 Programmer credential.

The Oracle 1Z0-809 is a 150-minute test with 85 questions, that are mainly of a multiple-choice format, but there may also be other types, such as drag and drop, simulations, or scenario-based. This certification exam is available in the English language and the passing score for it is 65%. However, you need to try to get more than that.

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Oracle 1z0-809 Korean Exam Syllabus Topics:

Section	Objectives
Java Class Design	- Object-oriented principles 1. Create singleton and immutable classes 2. Implement encapsulation 3. Implement inheritance and polymorphism 4. Use static variables, methods, and initialization blocks 5. Override equals, hashCode, and toString
Java Stream API	- Stream processing 1. Use findFirst, findAny, and match methods 2. Use map, flatMap, and peek 3. Collect and group stream results 4. Sort and filter data using streams 5. Use Optional
Java File I/O	- NIO.2 API 1. Read file attributes 2. Traverse directory structures 3. Use Path and Files classes
Advanced Java Class Design	- Advanced object-oriented features 1. Use the final keyword 2. Use abstract classes and interfaces 3. Develop Lambda expressions 4. Create nested and inner classes 5. Use enum types
Building Database Applications with JDBC	- Database connectivity 1. Execute SQL statements 2. Process ResultSet data 3. Use JDBC drivers and connections
Exceptions and Assertions	- Error handling 1. Use try-catch and try-with-resources 2. Create custom exceptions 3. Use assertions
Generics and Collections	- Collections framework 1. Use Comparator and Comparable 2. Create and use generic classes 3. Use ArrayList, TreeSet, TreeMap, and ArrayDeque 4. Iterate collections with Streams and forEach
Java Concurrency	- Multithreading 1. Create and manage threads 2. Use synchronized blocks and locks 3. Use ExecutorService 4. Use concurrent collections
Java SE 8 Date/Time API	- Date and time handling 1. Use Period and Duration 2. Format and parse date values 3. Use LocalDate, LocalTime, and LocalDateTime
Lambda Built-in Functional Interfaces	- Functional programming 1. Use UnaryOperator and BinaryOperator 2. Use Predicate, Consumer, Function, and Supplier 3. Use primitive functional interfaces
Java I/O Fundamentals	- Input and output 1. Use BufferedReader and BufferedWriter 2. Read and write files 3. Use serialization
Localization	- Internationalization 1. Handle localization properties 2. Format dates and numbers 3. Use Locale and ResourceBundle

Oracle 1z0-809 Korean : Java SE 8 Programmer II (1z0-809 Korean Version)

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