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Oracle 1z1-830 Exam Syllabus Topics:

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

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

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

4. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel
C) Chanel Dior Louis Vuitton
D) Compilation fails.

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

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

Solutions: