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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) Compilation fails
B) PT0H
C) PT0D
D) It throws an exception
E) PT6H

2. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) Compilation fails
B) 666 42
C) 42 42
D) 666 666

3. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" twice, then exits normally.
B) It prints "Task is complete" once, then exits normally.
C) It prints "Task is complete" once and throws an exception.
D) It exits normally without printing anything to the console.
E) It prints "Task is complete" twice and throws an exception.

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream<String> stream = Stream.builder().add("a").build();
B) Stream stream = Stream.of();
C) Stream stream = Stream.empty();
D) Stream stream = new Stream();
E) Stream stream = Stream.ofNullable("a");
F) Stream stream = Stream.generate(() -> "a");

5. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 only
B) Line 2 and line 3
C) Line 1 and line 2
D) The program successfully compiles
E) Line 2 only
F) Line 1 and line 3
G) Line 3 only

Solutions: