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Last Updated: Oct 24, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 2: Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| Topic 3: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Topic 4: 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 5: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 6: Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| Topic 7: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Use primitives and wrapper classes, evaluate expressions and apply type conversions |
| Topic 8: Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Topic 9: 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 10: Using Object-Oriented Concepts | 20% | - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. -UnitedSTATES
- B. -UNITEDSTATES
- C. United-States
- D. United-STATES
- E. -UnitedStates
- F. UNITED-STATES
- G. UnitedStates
Correct Answer: A 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. Chanel
- B. Compilation fails.
- C. An ArrayIndexOutOfBoundsException is thrown at runtime.
- D. Chanel Dior Louis Vuitton
Correct Answer: A 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
- A. stringBuilder2
- B. stringBuilder4
- C. None of them
- D. stringBuilder1
- E. stringBuilder3
Correct Answer: B 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Which two of the following aren't the correct ways to create a Stream?
- A. Stream stream = Stream.ofNullable("a");
- B. Stream stream = Stream.generate(() -> "a");
- C. Stream<String> stream = Stream.builder().add("a").build();
- D. Stream stream = new Stream();
- E. Stream stream = Stream.empty();
- F. Stream stream = Stream.of();
Correct Answer: C,D 🗳️
Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
- A. 3.3
- B. false
- C. An exception is thrown at runtime
- D. Compilation fails
- E. true
Correct Answer: D 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
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