Oracle 1z1-830

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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom
B) bim bam followed by an exception
C) bim bam boom
D) bim boom bam
E) Compilation fails.

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

3. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) Compilation fails
C) PT0H
D) PT6H
E) It throws an exception

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

5. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new B();
B) A a = new Test.A();
C) A a = new Test().new A();
D) B b = new Test.B();
E) B b = new Test().new B();
F) A a = new A();

Solutions: