Oracle 1z0-830 valid study dumps : Java SE 21 Developer Professional

Exam Code: 1z0-830
Exam Name: Java SE 21 Developer Professional
Updated: Sep 25, 2026
Q&As: 85 Questions and Answers

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Oracle 1z0-830 Exam Syllabus Topics:

Section	Objectives
Topic 1: Exception Handling	- Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions
Topic 2: Object-Oriented Programming	- Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction
Topic 3: Functional Programming	- Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API
Topic 4: Handling Date, Time, Text, Numeric and Boolean Values	- Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs
Topic 5: Java I/O and NIO	- Process file system resources - Use Path, Files, and related APIs - Read and write files
Topic 6: Collections and Generics	- Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types
Topic 7: Modules and Packaging	- Manage dependencies and exports - Package and deploy applications - Create and use Java modules
Topic 8: Java Concurrency	- Create and manage threads - Use virtual threads - Work with concurrent collections and executors
Topic 9: Annotations and JDBC	- Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC
Topic 10: Controlling Program Flow	- Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

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. oos.write("Today");
B. oos.writeObject("Today");
C. fos.write("Today");
D. fos.writeObject("Today");

Reveal Solution Discussion 0

Correct Answer: B 🗳️