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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 5 5 2 3
B) 1 5 5 1
C) 1 1 1 1
D) 1 1 2 2
E) 1 1 2 3

2. Which of the following java.io.Console methods doesnotexist?

A) reader()
B) readLine()
C) readPassword(String fmt, Object... args)
D) read()
E) readLine(String fmt, Object... args)
F) readPassword()

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

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

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

5. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
B) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6

Solutions: