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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

A. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
B. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
C. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false

Question 2

Which of the following can be the body of a lambda expression?

A. Two statements
B. None of the above
C. An expression and a statement
D. A statement block
E. Two expressions

Question 3

Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A. Compilation fails
B. [Paris, Toulouse]
C. [Paris]
D. [Lille, Lyon]
E. [Lyon, Lille, Toulouse]

Question 4

Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A. An exception is thrown at running Iphone15.ring();
B. Iphone15 class does not compile
C. Everything compiles
D. SmartPhone interface does not compile

Question 5

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

Solutions: