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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=2, a=3, b=1}
B) Compilation fails
C) {b=1, a=3, c=2}
D) {a=3, b=1, c=2}
E) {c=1, b=2, a=3}
F) {b=1, c=2, a=3}
G) {a=1, b=2, c=3}

2. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 1
B) Compilation fails
C) It's either 1 or 2
D) It's either 0 or 1
E) It's always 2

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

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

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) Compilation fails
C) IOException
D) ArithmeticException

5. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) true
B) A NullPointerException is thrown.
C) A ClassCastException is thrown.
D) Compilation fails.
E) false

Solutions: