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Oracle 1z0-830 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Functional Programming and Streams	15%	- Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references - Optional class, primitive streams
Topic 2: Using Object-Oriented Concepts	20%	- Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects - Inheritance, abstract classes, sealed classes, interfaces, polymorphism
Topic 3: Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Topic 4: Modules and Packaging	5%	- Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds
Topic 5: Working with Arrays and Collections	12%	- Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays
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%	- 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 8: Handling Exceptions	8%	- Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources
Topic 9: 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 10: Concurrency and Multithreading	10%	- Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A. execService.call(task2);
B. execService.execute(task1);
C. execService.submit(task1);
D. execService.run(task1);
E. execService.call(task1);
F. execService.submit(task2);
G. execService.run(task2);
H. execService.execute(task2);

Reveal Solution Discussion 0

Correct Answer: C,F 🗳️

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Question #2

Which of the following isn't a valid option of the jdeps command?

A. --print-module-deps
B. --list-deps
C. --generate-module-info
D. --generate-open-module
E. --check-deps
F. --list-reduced-deps

Reveal Solution Discussion 0

Correct Answer: E 🗳️

Explanation: Only visible for ValidExam members. You can sign-up / login (it's free).

Question #3

What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A. default
B. static
C. nothing
D. Compilation fails

Reveal Solution Discussion 0

Correct Answer: B 🗳️

Explanation: Only visible for ValidExam members. You can sign-up / login (it's free).

Question #4

Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A. It's a double with value: 42
B. Compilation fails.
C. null
D. It's a string with value: 42
E. It's an integer with value: 42
F. It throws an exception at runtime.

Reveal Solution Discussion 0

Correct Answer: B 🗳️

Explanation: Only visible for ValidExam members. You can sign-up / login (it's free).

Question #5

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?