Oracle 1z0-830 Q&A - in .pdf

Exam Code: 1z0-830
Exam Name: Java SE 21 Developer Professional
Updated: Sep 25, 2026
Q & A: 85 Questions and Answers
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Exam Name: Java SE 21 Developer Professional
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Oracle 1z0-830 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Using Object-Oriented Concepts	20%	- Overloading, overriding, Object class methods, immutable objects - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Enums, nested classes, local variable type inference - Classes, records, objects, constructors, initializers, methods, fields, encapsulation
Topic 2: 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
Topic 3: Working with Arrays and Collections	12%	- Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays
Topic 4: Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Topic 5: Controlling Program Flow	10%	- Loops: for, enhanced for, while, do-while, break, continue, return - Decision constructs: if-else, switch expressions and statements, pattern matching
Topic 6: Modules and Packaging	5%	- Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses
Topic 7: Java I/O and Localization	5%	- Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization
Topic 8: Functional Programming and Streams	15%	- Lambda expressions, functional interfaces, method references - Optional class, primitive streams - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning
Topic 9: Handling Exceptions	8%	- Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources
Topic 10: Concurrency and Multithreading	10%	- Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A. [,hello,h i]
B. [ , hello ,hi ]
C. [,hello,hi]
D. [ ,hello,h i]

Reveal Solution Discussion 0

Correct Answer: A 🗳️