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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A. Compilation fails
B. [Lille, Lyon]
C. [Lyon, Lille, Toulouse]
D. [Paris, Toulouse]
E. [Paris]

Question 2

What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A. Compilation fails
B. default
C. nothing
D. static

Question 3

Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A. Compilation fails.
B. bread:Baguette, dish:Frog legs, no cheese.
C. bread:bread, dish:dish, cheese.
D. bread:Baguette, dish:Frog legs, cheese.

Question 4

Which of the following doesnotexist?

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

Question 5

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

Solutions: