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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMM dd
B) MM d
C) MM dd
D) MMMM dd

3. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument is null
B) Only if assertions are disabled and the input argument is null
C) Only if assertions are disabled and the input argument isn't null
D) A NullPointerException is never thrown
E) Only if assertions are enabled and the input argument isn't null

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) abc
C) acb
D) cba
E) bca
F) cbca
G) bac

5. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) Both files f1.txt and f2.txt exist
B) File f2.txt exists while file f1.txt doesn't
C) Neither files f1.txt nor f2.txt exist
D) An exception is always thrown
E) File f1.txt exists while file f2.txt doesn't

Solutions: