Oracle 1z0-830 : Java SE 21 Developer Professional

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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) _$
B) Compilation fails.
C) It throws an exception.
D) 10

2. Which of the following doesnotexist?

A) BiSupplier<T, U, R>
B) LongSupplier
C) DoubleSupplier
D) They all exist.
E) Supplier<T>
F) BooleanSupplier

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

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

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

Solutions: