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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) P1Y
UnsupportedTemporalTypeException
B) P1Y
PT8784H
C) PT8784H
P1Y
D) UnsupportedTemporalTypeException

3. 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) static
B) default
C) Compilation fails
D) nothing

4. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithStaticField
B) ExtendingClass
C) ImplementingInterface
D) WithInstanceField

5. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red
green
blue
""";
B) None of the propositions
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red \s
green\s
blue \s
""";
E) java
String colors = """
red \t
green\t
blue \t
""";

Solutions: