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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, Pass4sureCert 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.
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- Updated on: Sep 14, 2026
- No. of Questions: 85 Questions & Answers
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- Updated on: Sep 14, 2026
- No. of Questions: 85 Questions & Answers
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Functional Programming and Streams | 15% | - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references - Optional class, primitive streams |
| Topic 2: 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 3: Java I/O and Localization | 5% | - File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates |
| Topic 4: Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| Topic 5: Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
| Topic 6: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime |
| Topic 7: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 8: Using Object-Oriented Concepts | 20% | - Overloading, overriding, Object class methods, immutable objects - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Enums, nested classes, local variable type inference |
| Topic 9: Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Topic 10: Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. bac
- B. cbca
- C. cba
- D. cacb
- E. acb
- F. abc
- G. bca
Correct Answer: C 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
- A. false
- B. Compilation fails.
- C. true
- D. A NullPointerException is thrown.
- E. A ClassCastException is thrown.
Correct Answer: C 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42 k
- B. 42 000,00 €
- C. 42000
- D. 42000E
Correct Answer: A 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
- A. var h = (g = 7);
- B. var d[] = new int[4];
- C. var e;
- D. var f = { 6 };
- E. var b = 2, c = 3.0;
- F. var a = 1;(Valid: var correctly infers int)
Correct Answer: B,C,D,E 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?
- A. An exception is thrown
- B. ok the 2024-07-10T07:17:45.523939600
- C. ok the 2024-07-10
- D. Compilation fails
Correct Answer: D 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
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