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:

I/O Fundamentals. It means the skill of reading and writing data from the console.
Advanced Class Design. Specifically, candidates must demonstrate skills in how to implement encapsulation, polymorphism, and inheritance.
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.
Exceptions and Assertions. In other words, how to use try-catch and throw statements, alongside creating custom exceptions and Auto-closeable resources.
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.
Generics and Collections. This allows the candidate to create and use a generic class as well as ArrayList, TreeSet, TreeMap, and ArrayDeque objects.
Java Concurrency. The candidates must be able to create worker threads, as well as to use parallel Fork/Join Framework and parallel Streams.

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.

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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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Oracle 1z0-809日本語 Exam Syllabus Topics:

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

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