- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 18, 2026
- Q & A: 85 Questions and Answers
Oracle Java SE 21 Developer Professional : 1z0-830
PDF Version DemoAbout Oracle 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 2: Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Topic 3: Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Topic 4: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 5: Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
| Topic 6: Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Topic 7: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs |
| Topic 8: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 9: Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Topic 10: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.
- A. Everything compiles
- B. SmartPhone interface does not compile
- C. An exception is thrown at running Iphone15.ring();
- D. Iphone15 class does not compile
Correct Answer: D 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #2
Which of the following java.io.Console methods doesnotexist?
- A. readPassword(String fmt, Object... args)
- B. readPassword()
- C. read()
- D. readLine(String fmt, Object... args)
- E. reader()
- F. readLine()
Correct Answer: C 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #3
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
- A. var e;
- B. var b = 2, c = 3.0;
- C. var h = (g = 7);
- D. var f = { 6 };
- E. var d[] = new int[4];
- F. var a = 1;(Valid: var correctly infers int)
Correct Answer: A,B,D,E 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #4
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. MMMM dd
- B. MMM dd
- C. MM d
- D. MM dd
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #5
Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
- A. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
- B. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
- C. An exception is thrown at runtime.
- D. {}
- E. Compilation fails.
Correct Answer: A 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
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