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Oracle 1z1-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

A) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
B) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
C) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
D) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
E) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);

2. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) Compilation fails at line n2.
B) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
C) An exception is thrown at runtime.
D) Nothing
E) Compilation fails at line n1.

3. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder1
B) stringBuilder4
C) None of them
D) stringBuilder2
E) stringBuilder3

4. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) It throws an exception at runtime.
B) Compilation fails.
C) long
D) nothing
E) integer
F) string

5. Which of the following suggestions compile?(Choose two.)

A) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
C) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
D) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}