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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following java.io.Console methods doesnotexist?

A) readLine(String fmt, Object... args)
B) read()
C) readLine()
D) readPassword(String fmt, Object... args)
E) reader()
F) readPassword()

2. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var h = (g = 7);
C) var e;
D) var a = 1;(Valid: var correctly infers int)
E) var b = 2, c = 3.0;
F) var f = { 6 };

3. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [a, b]
B) [d, b]
C) An UnsupportedOperationException is thrown
D) [d]
E) An IndexOutOfBoundsException is thrown
F) [c, b]

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

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

5. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) Compilation fails
B) An exception is thrown at runtime
C) Numbers from 1 to 1945 randomly
D) Numbers from 1 to 25 sequentially
E) Numbers from 1 to 25 randomly

Solutions: