Oracle 1z1-830

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Oracle 1z1-830 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) Compilation fails
C) ArithmeticException
D) IOException

2. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) abc
B) ABC
C) Compilation fails.
D) An exception is thrown.

3. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) Compilation error
B) C:
C) IllegalArgumentException
D) C
E) home

4. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000
B) 42 000,00 €
C) 42000E
D) 42 k

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

Solutions: