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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) WithInstanceField
C) WithStaticField
D) ExtendingClass

3. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim boom
C) Compilation fails.
D) bim bam followed by an exception
E) bim boom bam

4. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'final' modifier with all kinds of classes
E) You can use 'protected' access modifier with all kinds of classes

5. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It's a double with value: 42
C) It's an integer with value: 42
D) It throws an exception at runtime.
E) Compilation fails.
F) null

Solutions: