Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

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

2. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.execute(task1);
B) execService.call(task1);
C) execService.execute(task2);
D) execService.run(task1);
E) execService.submit(task1);
F) execService.submit(task2);
G) execService.call(task2);
H) execService.run(task2);

3. Which of the following doesnotexist?

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

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

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

Solutions: