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Instant Download Oracle : 1z1-830 Questions & Answers as PDF & Test Engine

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Sep 23, 2026
No. of Questions: 85 Questions and Answers
Download Limit: Unlimited

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A. An exception is thrown
B. Compilation fails
C. ok the 2024-07-10
D. ok the 2024-07-10T07:17:45.523939600

Reveal Solution Discussion 0

Correct Answer: B 🗳️