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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 2: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 3: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 4: 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 |
| Topic 5: Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| 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: 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 9: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Topic 10: Using Object-Oriented Concepts | 20% | - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
- A. var d[] = new int[4];
- B. var a = 1;(Valid: var correctly infers int)
- C. var f = { 6 };
- D. var h = (g = 7);
- E. var b = 2, c = 3.0;
- F. var e;
Correct Answer: A,C,E,F 🗳️
Explanation: Only visible for VCE4Dumps members. You can sign-up / login (it's free).
Which of the following java.io.Console methods doesnotexist?
- A. readPassword(String fmt, Object... args)
- B. readLine()
- C. readLine(String fmt, Object... args)
- D. reader()
- E. readPassword()
- F. read()
Correct Answer: F 🗳️
Explanation: Only visible for VCE4Dumps members. You can sign-up / login (it's free).
Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)
- A. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
- B. MyService service = ServiceLoader.getService(MyService.class);
- C. MyService service = ServiceLoader.load(MyService.class).iterator().next();
- D. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
Correct Answer: C,D 🗳️
Explanation: Only visible for VCE4Dumps members. You can sign-up / login (it's free).
Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?
- A. Rose
- B. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
- C. Saint-Emilion
- D. Beaujolais Nouveau, Chablis, Saint-Emilion
Correct Answer: D 🗳️
Explanation: Only visible for VCE4Dumps 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.generate(() -> "a");
- B. Stream stream = Stream.empty();
- C. Stream<String> stream = Stream.builder().add("a").build();
- D. Stream stream = Stream.ofNullable("a");
- E. Stream stream = new Stream();
- F. Stream stream = Stream.of();
Correct Answer: C,E 🗳️
