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

2. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder3
B) stringBuilder1
C) stringBuilder4
D) None of them
E) stringBuilder2

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

4. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MM dd
B) MMMM dd
C) MMM dd
D) MM d

5. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) You can use 'protected' access modifier with all kinds of classes
C) You can use 'final' modifier with all kinds of classes
D) You can use 'public' access modifier with all kinds of classes
E) None

Solutions: