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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 2 2
B) 1 1 2
C) An exception is thrown.
D) 1 1 1
E) 1 2 1
F) 2 1 2
G) 1 2 2
H) 2 1 1
I) 2 2 1

2. 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
B) Compilation fails.
C) An exception is thrown at runtime.
D) Peugeot 807

3. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
C) MyService service = ServiceLoader.getService(MyService.class);
D) MyService service = ServiceLoader.load(MyService.class).iterator().next();

4. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ ,hello,h i]
B) [ , hello ,hi ]
C) [,hello,h i]
D) [,hello,hi]

5. Which of the following statements is correct about a final class?

A) It must contain at least a final method.
B) It cannot be extended by any other class.
C) It cannot implement any interface.
D) It cannot extend another class.
E) The final keyword in its declaration must go right before the class keyword.

Solutions: