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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following doesnotexist?

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

2. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Iphone15 class does not compile
B) SmartPhone interface does not compile
C) An exception is thrown at running Iphone15.ring();
D) Everything compiles

3. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) True
B) False

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

5. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [a, b]
B) [c, b]
C) [d]
D) [d, b]
E) An UnsupportedOperationException is thrown
F) An IndexOutOfBoundsException is thrown

Solutions: