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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 2: Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Topic 3: Using Object-Oriented Concepts | 20% | - Overloading, overriding, Object class methods, immutable objects - Enums, nested classes, local variable type inference - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation |
| Topic 4: Functional Programming and Streams | 15% | - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Optional class, primitive streams - Lambda expressions, functional interfaces, method references |
| Topic 5: Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Topic 6: Java I/O and Localization | 5% | - File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates |
| Topic 7: 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 8: Concurrency and Multithreading | 10% | - Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads |
| Topic 9: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer |
| Topic 10: Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
- A. {a=3, b=1, c=2}
- B. {c=2, a=3, b=1}
- C. {b=1, a=3, c=2}
- D. {b=1, c=2, a=3}
- E. Compilation fails
- F. {a=1, b=2, c=3}
- G. {c=1, b=2, a=3}
Correct Answer: A 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?
- A. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
- B. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
- C. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
- D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Correct Answer: D 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?
- A. truetruetrue
- B. truetruefalse
- C. Compilation fails
- D. truefalsetrue
- E. falsetruetrue
Correct Answer: D 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?
- A. An exception is thrown
- B. Optional[1]
- C. Optional.empty
- D. 2
- E. 0
- F. Compilation fails
- G. 1
Correct Answer: G 🗳️
Explanation: Only visible for Prep4sureExam 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<String> stream = Stream.builder().add("a").build();
- B. Stream stream = Stream.ofNullable("a");
- C. Stream stream = Stream.of("a");
- D. Stream stream = new Stream();
- E. Stream stream = Stream.generate(() -> "a");
- F. Stream stream = Stream.of();
- G. Stream stream = Stream.empty();
Correct Answer: A,D 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
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