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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Topic 2: 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 3: Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| 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: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Topic 7: Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Topic 8: Functional Programming and Streams | 15% | - Lambda expressions, functional interfaces, method references - Optional class, primitive streams - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning |
| Topic 9: Java I/O and Localization | 5% | - Resource bundles, locale, formatting messages, numbers, dates - File I/O, NIO.2, streams, readers/writers, serialization |
| Topic 10: Controlling Program Flow | 10% | - Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following java.io.Console methods doesnotexist?
- A. reader()
- B. readPassword()
- C. readPassword(String fmt, Object... args)
- D. readLine()
- E. readLine(String fmt, Object... args)
- F. read()
Explanation: Only visible for Prep4SureReview members. You can sign-up / login (it's free).
Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?
- A. PT8784H
P1Y - B. P1Y
PT8784H - C. UnsupportedTemporalTypeException
- D. P1Y
UnsupportedTemporalTypeException
Explanation: Only visible for Prep4SureReview members. You can sign-up / login (it's free).
What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
- A. It throws an exception
- B. PT6H
- C. Compilation fails
- D. PT0D
- E. PT0H
Explanation: Only visible for Prep4SureReview members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. An exception is thrown.
- B. 1 2 3 4
- C. 0 1 2
- D. 1 2 3
- E. 0 1 2 3
- F. Compilation fails.
Explanation: Only visible for Prep4SureReview members. You can sign-up / login (it's free).
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
- A. MM dd
- B. MMMM dd
- C. MM d
- D. MMM dd
Explanation: Only visible for Prep4SureReview members. You can sign-up / login (it's free).
Maximilian 
Zora 
Truda 
Meroy 
Nelson 
Tim 
Bella 
Jerome 
Riva 
Arvin 
William 
Bishop 
Lydia 
Gabrielle 
Clifford 
Natividad 
Paula 
Angelo 
Reuben 
Monroe 
Sophia 
