Oracle 1z1-830 valid exam dumps : Java SE 21 Developer Professional

Exam Code: 1z1-830
Exam Name: Java SE 21 Developer Professional
Updated: Oct 02, 2026
Q&As: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A. Compilation fails.
B. A ClassCastException is thrown.
C. A NullPointerException is thrown.
D. true
E. false

Reveal Solution Discussion 0

Correct Answer: D 🗳️