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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the followingisn'ta correct way to write a string to a file?

A) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
B) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
C) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
D) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
E) None of the suggestions
F) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}

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

3. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) Compilation fails
B) It's always 2
C) It's either 0 or 1
D) It's either 1 or 2
E) It's always 1

4. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) Compilation fails at line n2.
B) Compilation fails at line n1.
C) An exception is thrown at runtime.
D) Nothing
E) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.

5. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
B) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
C) MyService service = ServiceLoader.load(MyService.class).iterator().next();
D) MyService service = ServiceLoader.getService(MyService.class);

Solutions: