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Oracle 1z0-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A. It's a double with value: 42
B. null
C. It throws an exception at runtime.
D. Compilation fails.
E. It's a string with value: 42
F. It's an integer with value: 42

Reveal Solution Discussion 0

Correct Answer: D 🗳️