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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream stream = Stream.of("a");
C) Stream stream = Stream.empty();
D) Stream stream = Stream.of();
E) Stream<String> stream = Stream.builder().add("a").build();
F) Stream stream = Stream.generate(() -> "a");
G) Stream stream = new Stream();

2. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 42
B) 666 666
C) Compilation fails
D) 42 42

3. 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
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
C) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
D) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
E) None of the suggestions
F) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}

4. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 5 5 1
B) 1 1 2 2
C) 1 1 1 1
D) 1 1 2 3
E) 5 5 2 3

5. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) Compilation fails.
B) 0 1 2 3
C) 1 2 3 4
D) 1 2 3
E) 0 1 2
F) An exception is thrown.

Solutions: