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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) falsetruetrue
B) truetruefalse
C) Compilation fails
D) truetruetrue
E) truefalsetrue

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

A) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
B) 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;
}
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
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}

3. Which of the following statements are correct?

A) None
B) You can use 'final' modifier with all kinds of classes
C) You can use 'private' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'public' access modifier with all kinds of classes

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

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

5. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) Compilation fails.
B) _$
C) It throws an exception.
D) 10

Solutions: