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Oracle 1z1-830 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: 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: 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 4: 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 |
| Topic 5: Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| Topic 6: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Topic 7: Functional Programming and Streams | 15% | - Lambda expressions, functional interfaces, method references - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Optional class, primitive streams |
| Topic 8: Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| 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: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
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 b = 2, c = 3.0;
- C. var h = (g = 7);
- D. var f = { 6 };
- E. var a = 1;(Valid: var correctly infers int)
- F. var e;
Correct Answer: A,B,D,F 🗳️
Explanation: Only visible for Lead2PassExam 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.empty();
- C. Stream<String> stream = Stream.builder().add("a").build();
- D. Stream stream = Stream.generate(() -> "a");
- E. Stream stream = new Stream();
- F. Stream stream = Stream.of();
Correct Answer: C,E 🗳️
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. bim bam boom
- B. bim bam followed by an exception
- C. Compilation fails.
- D. bim boom
- E. bim boom bam
Correct Answer: A 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?
- A. Peugeot
- B. An exception is thrown at runtime.
- C. Compilation fails.
- D. Peugeot 807
Correct Answer: C 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
- A. File f1.txt exists while file f2.txt doesn't
- B. File f2.txt exists while file f1.txt doesn't
- C. Both files f1.txt and f2.txt exist
- D. Neither files f1.txt nor f2.txt exist
- E. An exception is always thrown
Correct Answer: E 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
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