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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
C) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
D) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6

2. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'protected' access modifier with all kinds of classes
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) None

3. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array2
B) array1
C) array3
D) array5
E) array4

4. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

A) Peugeot 807
B) An exception is thrown at runtime.
C) Compilation fails.
D) Peugeot

5. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.execute(task1);
B) execService.submit(task2);
C) execService.submit(task1);
D) execService.call(task2);
E) execService.run(task2);
F) execService.execute(task2);
G) execService.run(task1);
H) execService.call(task1);

Solutions: