Oracle 1z0-830 Exam : Java SE 21 Developer Professional

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Oracle 1z0-830 Exam Syllabus Topics:

Section	Objectives
Input/Output and File Handling	- NIO and file operations 1. File, Path, and Streams APIs 2. Serialization basics
Database Connectivity (JDBC)	- Database interaction 1. SQL execution and result handling 2. JDBC API usage
Concurrency and Multithreading	- Thread management 1. Virtual threads and structured concurrency concepts 2. Thread lifecycle and synchronization
Object-Oriented Programming	- Core OOP principles 1. Encapsulation, inheritance, polymorphism 2. Abstract classes and interfaces
Core APIs	- Java standard library usage 1. Date and Time API 2. Collections Framework 3. Streams and functional programming
Advanced Java Features (Java SE 21)	- Modern language features 1. Records and record patterns 2. Sealed classes 3. Pattern matching for switch 4. Virtual threads (Project Loom)
Java Language Fundamentals	- Java syntax and language structure 1. Control flow statements 2. Data types, variables, and operators
Exception Handling and Debugging	- Error handling mechanisms 1. Try-with-resources 2. Checked vs unchecked exceptions

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A. Sum: 22.0, Max: 8.5, Avg: 5.5
B. An exception is thrown at runtime.
C. Sum: 22.0, Max: 8.5, Avg: 5.0
D. Compilation fails.

Reveal Solution Discussion 0

Correct Answer: A 🗳️