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Oracle 1z0-830 : Java SE 21 Developer Professional
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 23, 2026
- Q & A: 85 Questions and Answers
About Oracle 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| 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 |
| Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?
- A. An exception is thrown.
- B. Compilation fails.
- C. ABC
- D. abc
Correct Answer: D 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #2
Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?
- A. fos.writeObject("Today");
- B. oos.write("Today");
- C. fos.write("Today");
- D. oos.writeObject("Today");
Correct Answer: D 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #3
Which two of the following aren't the correct ways to create a Stream?
- A. Stream stream = Stream.ofNullable("a");
- B. Stream stream = Stream.of();
- C. Stream stream = Stream.empty();
- D. Stream<String> stream = Stream.builder().add("a").build();
- E. Stream stream = new Stream();
- F. Stream stream = Stream.of("a");
- G. Stream stream = Stream.generate(() -> "a");
Correct Answer: D,E 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #4
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. long
- B. It throws an exception at runtime.
- C. integer
- D. nothing
- E. Compilation fails.
- F. string
Correct Answer: E 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #5
How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?
- A. var concurrentHashMap = new ConcurrentHashMap(42);
- B. var concurrentHashMap = new ConcurrentHashMap(42, 10);
- C. var concurrentHashMap = new ConcurrentHashMap();
- D. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
- E. None of the suggestions.
Correct Answer: D 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
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