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Oracle 1z1-830 Exam Syllabus Topics:

Section	Weight	Objectives
Java I/O and Localization	5%	- File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates
Functional Programming and Streams	15%	- Optional class, primitive streams - Lambda expressions, functional interfaces, method references - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning
Concurrency and Multithreading	10%	- Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety
Working with Arrays and Collections	12%	- Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays
Handling Exceptions	8%	- Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources
Handling Date, Time, Text, Numeric and Boolean Values	12%	- Use primitives and wrapper classes, evaluate expressions and apply type conversions - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Manipulate text, text blocks, String, StringBuilder and StringBuffer
Using Object-Oriented Concepts	20%	- Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Enums, nested classes, local variable type inference - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Overloading, overriding, Object class methods, immutable objects
Modules and Packaging	5%	- Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds
Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Controlling Program Flow	10%	- Loops: for, enhanced for, while, do-while, break, continue, return - Decision constructs: if-else, switch expressions and statements, pattern matching

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
B. {}
C. An exception is thrown at runtime.
D. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E. Compilation fails.

Answer: A