Java SE 21 Developer Professional: 1z1-830 Exam

"Java SE 21 Developer Professional", also known as 1z1-830 exam, is a Oracle Certification. With the complete collection of questions and answers, ExamcollectionPass has assembled to take you through 85 Q&As to your 1z1-830 Exam preparation. In the 1z1-830 exam resources, you will cover every field and category in Java SE Certification helping to ready you for your successful Oracle Certification.

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Total Questions: 85

Certification Provider: Oracle
Corresponding Certification: Java SE
Updated on: Oct 05, 2026

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Which of the followingisn'ta correct way to write a string to a file?

A. java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
B. java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
C. None of the suggestions
D. java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
E. java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
F. java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}

Reveal Solution Discussion 0

Correct Answer: E 🗳️