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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) Numbers from 1 to 1945 randomly
B) Compilation fails
C) Numbers from 1 to 25 randomly
D) An exception is thrown at runtime
E) Numbers from 1 to 25 sequentially

2. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ ,hello,h i]
B) [,hello,h i]
C) [,hello,hi]
D) [ , hello ,hi ]

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

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

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

5. Which of the following doesnotexist?

A) LongSupplier
B) They all exist.
C) Supplier<T>
D) BooleanSupplier
E) DoubleSupplier
F) BiSupplier<T, U, R>

Solutions: