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Updated: Sep 09, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Topic 2: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 3: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 4: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs |
| Topic 5: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 6: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 7: Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Topic 8: Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| Topic 9: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Topic 10: Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
Oracle Java SE 21 Developer Professional Sample Questions:
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.execute(task2);
- B. execService.call(task2);
- C. execService.run(task2);
- D. execService.call(task1);
- E. execService.submit(task2);
- F. execService.submit(task1);
- G. execService.execute(task1);
- H. execService.run(task1);
Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
- A. Java
- B. null
- C. Optional[Java]
- D. Compilation fails
Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).
What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}
- A. 42 42
- B. 666 666
- C. 666 42
- D. Compilation fails
Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).
Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?
- A. integer
- B. nothing
- C. string
- D. It throws an exception at runtime.
- E. Compilation fails.
- F. long
Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).
Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.
- A. SmartPhone interface does not compile
- B. Iphone15 class does not compile
- C. Everything compiles
- D. An exception is thrown at running Iphone15.ring();
Explanation: Only visible for ExamsLabs members. You can sign-up / login (it's free).
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