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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 2
B) It's either 1 or 2
C) Compilation fails
D) It's always 1
E) It's either 0 or 1

2. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) Compilation fails
B) JamesJeanne
C) MissingResourceException
D) Jeanne
E) JeanneJames
F) James

3. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Rose
B) Beaujolais Nouveau, Chablis, Saint-Emilion
C) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
D) Saint-Emilion

4. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US-UK
B) US=UK
C) Compilation fails.
D) =US-UK
E) An exception is thrown.
F) -US=UK

5. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
B) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop