- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 23, 2026
- Q & A: 85 Questions and Answers
Oracle Java SE 21 Developer Professional : 1z1-830 exam
PDF Version DemoAbout Oracle Java SE 21 Developer Professional : 1z1-830 Exam Questions
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Java I/O and NIO | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
| Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
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 boom bam
- B. bim bam boom
- C. bim bam followed by an exception
- D. bim boom
- E. Compilation fails.
Correct Answer: B 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #2
Which of the followingisn'ta correct way to write a string to a file?
- A. java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
} - B. java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
} - C. java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes); - D. java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
} - E. None of the suggestions
- F. java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #3
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 807
- B. Peugeot
- C. An exception is thrown at runtime.
- D. Compilation fails.
Correct Answer: D 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #4
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
- A. Line 2 and line 3
- B. Line 1 and line 3
- C. Line 2 only
- D. Line 3 only
- E. Line 1 only
- F. Line 1 and line 2
- G. The program successfully compiles
Correct Answer: G 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #5
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 2
- B. It throws an exception at runtime.
- C. 0
- D. 1
- E. Compilation fails.
Correct Answer: E 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
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