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Oracle 1z0-830 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) Compilation fails
B) James
C) JeanneJames
D) JamesJeanne
E) Jeanne
F) MissingResourceException

2. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
B) var concurrentHashMap = new ConcurrentHashMap();
C) var concurrentHashMap = new ConcurrentHashMap(42, 10);
D) None of the suggestions.
E) var concurrentHashMap = new ConcurrentHashMap(42);

3. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" twice and throws an exception.
B) It prints "Task is complete" once, then exits normally.
C) It prints "Task is complete" twice, then exits normally.
D) It prints "Task is complete" once and throws an exception.
E) It exits normally without printing anything to the console.

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

5. Which of the following methods of java.util.function.Predicate aredefault methods?

A) or(Predicate<? super T> other)
B) not(Predicate<? super T> target)
C) isEqual(Object targetRef)
D) and(Predicate<? super T> other)
E) test(T t)
F) negate()

Solutions: