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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the followingisn'ta correct way to write a string to a file?

A) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
B) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
C) None of the suggestions
D) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
E) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
F) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}

2. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class does not allow null elements.
B) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
C) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
D) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
E) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

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

4. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) UnsupportedTemporalTypeException
B) P1Y
UnsupportedTemporalTypeException
C) PT8784H
P1Y
D) P1Y
PT8784H

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

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

Solutions: