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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Collections and Generics | - Use sequenced collections and maps - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations |
| Topic 2: Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Topic 3: 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 |
| Topic 4: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 5: Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Topic 6: Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Topic 7: Annotations and JDBC | - Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC |
| Topic 8: Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Topic 9: Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Topic 10: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
Oracle Java SE 21 Developer Professional Sample Questions:
Question 1
Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
A. B
B. E
C. None of the above
D. C
E. D
F. A
Question 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. An exception is thrown at runtime.
B. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
C. Compilation fails at line n2.
D. Compilation fails at line n1.
E. Nothing
Question 3
Which of the following can be the body of a lambda expression?
A. Two expressions
B. A statement block
C. Two statements
D. None of the above
E. An expression and a statement
Question 4
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. bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C. css
CopyEdit
javac -path 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
Question 5
Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
A. false
B. A ClassCastException is thrown.
C. Compilation fails.
D. A NullPointerException is thrown.
E. true
Solutions:
| Question 1 Answer: C | Question 2 Answer: D | Question 3 Answer: B | Question 4 Answer: D | Question 5 Answer: E |
