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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following suggestions compile?(Choose two.)

A) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
B) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
C) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
D) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

2. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) integer
B) nothing
C) string
D) It throws an exception at runtime.
E) Compilation fails.
F) long

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

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

4. 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 1 1
B) 1 2 2
C) 1 1 2
D) 2 2 2
E) 2 2 1
F) An exception is thrown.
G) 2 1 2
H) 2 1 1
I) 1 2 1

5. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) Compilation fails at line n2.
C) markdown
Inner class:
------------
Outer field
D) Compilation fails at line n1.
E) Nothing

Solutions: