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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) UnitedStates
C) UNITED-STATES
D) -UNITEDSTATES
E) -UnitedStates
F) United-STATES
G) United-States

2. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) None of the suggestions.
B) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

3. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 11
B) 10
C) 12
D) 14

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

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

Solutions: