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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following isn't a valid option of the jdeps command?

A) --list-deps
B) --print-module-deps
C) --generate-module-info
D) --check-deps
E) --generate-open-module
F) --list-reduced-deps

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

3. Which of the following methods of java.util.function.Predicate aredefault methods?

A) or(Predicate<? super T> other)
B) and(Predicate<? super T> other)
C) isEqual(Object targetRef)
D) negate()
E) test(T t)
F) not(Predicate<? super T> target)

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

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

5. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) fos.write("Today");
B) oos.write("Today");
C) fos.writeObject("Today");
D) oos.writeObject("Today");

Solutions: