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1z0-830 Q&A - in .pdf
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 29, 2026
- Q & A: 85 Questions and Answers
- Convenient, easy to study.
Printable Oracle 1z0-830 PDF Format. It is an electronic file format regardless of the operating system platform.
100% Money Back Guarantee. - PDF Price: $59.99
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- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
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- Updated: Sep 29, 2026
- Q & A: 85 Questions and Answers
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- Value Pack Total: $119.98 $79.99
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1z0-830 Q&A - Testing Engine
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 29, 2026
- Q & A: 85 Questions and Answers
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| 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 |
| Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Controlling Program Flow | 10% | - Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return |
| 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 |
| Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| 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 |
| Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
Which of the following statements are correct?
- A. You can use 'final' modifier with all kinds of classes
- B. You can use 'private' access modifier with all kinds of classes
- C. None
- D. You can use 'protected' access modifier with all kinds of classes
- E. You can use 'public' access modifier with all kinds of classes
Correct Answer: C 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #2
What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
- A. PT0D
- B. PT0H
- C. PT6H
- D. It throws an exception
- E. Compilation fails
Correct Answer: C 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #3
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:Baguette, dish:Frog legs, no cheese.
- B. bread:bread, dish:dish, cheese.
- C. Compilation fails.
- D. bread:Baguette, dish:Frog legs, cheese.
Correct Answer: A 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #4
Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?
- A. US=UK
- B. An exception is thrown.
- C. -US=UK
- D. Compilation fails.
- E. US-UK
- F. =US-UK
Correct Answer: F 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
Question #5
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
- A. MMMM dd
- B. MM d
- C. MMM dd
- D. MM dd
Correct Answer: A 🗳️
Explanation: Only visible for PracticeDump members. You can sign-up / login (it's free).
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