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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It does not compile.
B) It compiles.
C) It throws an exception at runtime.

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

A) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
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) The unnamed module can only access packages defined in the unnamed module.
D) The unnamed module exports all of its packages.
E) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
F) Code in an explicitly named module can access types in the unnamed module.

3. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 42 42
B) 666 666
C) Compilation fails
D) 666 42

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

5. 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) 1 2 2
B) An exception is thrown.
C) 2 2 2
D) 2 2 1
E) 1 2 1
F) 2 1 1
G) 1 1 1
H) 1 1 2
I) 2 1 2

Solutions: