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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A. null
B. Compilation fails
C. Java
D. Optional[Java]

Question #2
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A. home
B. IllegalArgumentException
C. C:
D. C
E. Compilation error

Question #3
Which of the following java.io.Console methods doesnotexist?

A. read()
B. readPassword()
C. reader()
D. readLine()
E. readLine(String fmt, Object... args)
F. readPassword(String fmt, Object... args)

Question #4
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A. Compilation fails
B. IOException
C. ArithmeticException
D. RuntimeException

Question #5
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A. abc
B. acb
C. cba
D. cacb
E. bca
F. cbca
G. bac