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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) James
B) MissingResourceException
C) JamesJeanne
D) JeanneJames
E) Jeanne
F) Compilation fails

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

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

3. 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

4. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) A ClassCastException is thrown.
B) A NullPointerException is thrown.
C) true
D) false
E) Compilation fails.

5. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of("a");
B) Stream stream = Stream.generate(() -> "a");
C) Stream stream = Stream.empty();
D) Stream<String> stream = Stream.builder().add("a").build();
E) Stream stream = Stream.ofNullable("a");
F) Stream stream = new Stream();
G) Stream stream = Stream.of();

Solutions: