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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Topic 2: Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Topic 3: Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Topic 4: Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| Topic 5: Java I/O and NIO | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Topic 6: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 7: Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| 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: Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Topic 10: Functional Programming | - Process data using Stream API - Work with functional interfaces - Use lambda expressions and method references |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?
- A. Peugeot 807
- B. Peugeot
- C. Compilation fails.
- D. An exception is thrown at runtime.
Correct Answer: C 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
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. MissingResourceException
- B. James
- C. JamesJeanne
- D. Compilation fails
- E. JeanneJames
- F. Jeanne
Correct Answer: F 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It throws an exception.
- B. Compilation fails.
- C. It prints all elements, but changes made during iteration may not be visible.
- D. It prints all elements, including changes made during iteration.
Correct Answer: C 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?
- A. An exception is thrown.
- B. Compilation fails.
- C. ABC
- D. abc
Correct Answer: D 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
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. A
- B. C
- C. E
- D. None of the above
- E. B
- F. D
Correct Answer: D 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
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