The participants are prepared for the current Oracle Certified Professional SE 17 Developer certification (1Z0-829).

Among other things, questions from the following subject areas are practiced:

• Handing date, time, text, numeric and boolean values
• Controlling Program Flow
• Utilizing Java Object-Oriented Approach
• Handling Exceptions
• Working with Arrays and Collections
• Working with Streams and Lambda expressions
• Package and deploy Java code and use the Java Platform Module System
• Manage concurrent code execution
• Use Java I/O API
• Access databases using JDBC
• Implement Localization

Passing date, time, text, numeric and boolean values
• Use primitives and wrapper classes including Math API, parentheses, type promotion, and cast to evaluate arithmetic and boolean expressions
• Manipulate text, including blocks of text, with the String and StringBuilder classes
• Edit date, time, duration, period, point in time, and time zone objects using the Date-Time API
• Create program flow control constructs, including if/else, switch statements and expressions, loops, and break and continue statements

Using the object-oriented Java approach

• Declare and instantiate Java objects, including nested class objects, and explain the object lifecycle, including creation, reference reassignment, and garbage collection
• Create classes and records, and define and use instance and static fields and methods, constructors, and instance and static initializers
• Implement overloading, including var-arg methods
• Verstehen Sie Variablenbereiche, wenden Sie Kapselung an und machen Sie Objekte unveränderlich. Verwenden Sie die Inferenz lokaler Variablentypen, einschließlich der Verwendung zum Definieren von Lambda-Parametern
• Implementieren Sie die Vererbung, einschließlich abstrakter und versiegelter Klassen. Überschreiben Sie Methoden, einschließlich der einer Object-Klasse. Nutzen Sie Polymorphismus und Typumwandlung und unterscheiden Sie Objekttyp und Referenztyp. Identifizieren Sie Objekttypen mithilfe von Operatorinstanzen und Mustervergleichen
• Create and use interfaces, identify functional interfaces, and leverage private, static, and standard interface methods
• Create and use enums with fields, methods, and constructors

handle exceptions

• Handle exceptions using try/catch/finally, try-with-resources, and multi-catch blocks, including custom exceptions

Working with arrays and collections

• Create Java Arrays, List, Set, Map and Deque collections and create, remove, update, retrieve and sort their elements

Working with streams and lambda expressions

• Use Java objects and primitive streams, including lambda expressions that implement functional interfaces, to create, filter, transform, consume, and sort data
• Perform decomposition, concatenation and reduction, as well as grouping and partitioning for sequential and parallel streams

Package and implement Java code and use the Java Platform Module System

• Define modules and expose module content, including using reflection, and declare module dependencies, define services, providers and consumers
• Compile Java code, create modular and non-modular JAR files, run-time images, and implement migration using unnamed and automated modules

Manage concurrent code execution

• Create worker threads with Runnable and Callable, manage thread lifecycle including automations provided by various executor services and concurrent API
• Develop thread-safe code using various locking mechanisms and concurrent API
• Process Java collections concurrently and take advantage of parallel streams.

Use the Java I/O API

• Read and write console and file data using I/O streams
• Serialize and deserialize Java objects
• Construct, iterate, create, read and write path objects and their properties using the java.nio.file API

Access databases with JDBC

• Create connections, create and execute simple, prepared and invocable statements, process query results and control transactions using the JDBC API

implement localization

• Implement localization using locales, resource packs, parse and format messages, dates, times and numbers, including currency and percentage values