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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) MM d
B) MMM dd
C) MM dd
D) MMMM dd

2. 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) C
B) IllegalArgumentException
C) C:
D) home
E) Compilation error

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

4. 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) ArithmeticException
C) IOException
D) Compilation fails

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

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

Solutions: