Oracle 1z0-830 Value Package

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Exam Code: 1z0-830
Exam Name: Java SE 21 Developer Professional
No. of Questions: 85 Questions and Answers
Updated: Sep 10, 2026

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Oracle 1z0-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A. Compilation fails at line n2.
B. Compilation fails at line n1.
C. markdown
Inner class:
------------
Outer field
D. An exception is thrown at runtime.
E. Nothing

Reveal Solution Discussion 0

Correct Answer: B 🗳️