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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'private' access modifier with all kinds of classes
E) You can use 'protected' access modifier with all kinds of classes

2. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:bread, dish:dish, cheese.
B) Compilation fails.
C) bread:Baguette, dish:Frog legs, no cheese.
D) bread:Baguette, dish:Frog legs, cheese.

3. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) Chanel Dior Louis Vuitton
C) An ArrayIndexOutOfBoundsException is thrown at runtime.
D) Compilation fails.

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) IOException
B) RuntimeException
C) Compilation fails
D) ArithmeticException

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

Solutions: