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

2. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) 2
B) 1
C) Compilation fails
D) NotSerializableException
E) ClassCastException

3. 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

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) 01
B) Compilation fails
C) An exception is thrown
D) Nothing
E) 012

5. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 2
B) 1
C) Compilation fails.
D) It throws an exception at runtime.
E) 0

Solutions: