Oracle 1z0-830 : Java SE 21 Developer Professional
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 15, 2026
- Q & A: 85 Questions and Answers
About Oracle 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Topic 2: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 3: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Topic 4: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 5: Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Topic 6: Java Concurrency | - Use virtual threads - Work with concurrent collections and executors - Create and manage threads |
| Topic 7: Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Topic 8: Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Topic 9: Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Topic 10: Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
Oracle Java SE 21 Developer Professional Sample Questions:
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
- A. IllegalArgumentException
- B. C:
- C. C
- D. home
- E. Compilation error
Correct Answer: D 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. An ArrayIndexOutOfBoundsException is thrown at runtime.
- B. Chanel Dior Louis Vuitton
- C. Compilation fails.
- D. Chanel
Correct Answer: D 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?
- A. [Paris, Toulouse]
- B. [Paris]
- C. [Lyon, Lille, Toulouse]
- D. Compilation fails
- E. [Lille, Lyon]
Correct Answer: E 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
- A. An exception is thrown
- B. 01
- C. 012
- D. Nothing
- E. Compilation fails
Correct Answer: B 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?
- A. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose - B. An exception is thrown at runtime.
- C. Compilation fails.
- D. Nothing
Correct Answer: C 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
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