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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) RuntimeException
B) IOException
C) Compilation fails
D) ArithmeticException

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

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

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

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) 01
B) Nothing
C) Compilation fails
D) 012
E) An exception is thrown

5. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.run(task2);
B) execService.execute(task1);
C) execService.submit(task2);
D) execService.call(task1);
E) execService.run(task1);
F) execService.call(task2);
G) execService.execute(task2);
H) execService.submit(task1);

Solutions: