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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following isn't a valid option of the jdeps command?

A) --check-deps
B) --print-module-deps
C) --generate-open-module
D) --list-deps
E) --generate-module-info
F) --list-reduced-deps

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

3. Which three of the following are correct about the Java module system?

A) The unnamed module can only access packages defined in the unnamed module.
B) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
C) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
D) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
E) Code in an explicitly named module can access types in the unnamed module.
F) The unnamed module exports all of its packages.

4. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) NotSerializableException
B) ClassCastException
C) 1
D) 2
E) Compilation fails

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

Solutions: