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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) UnsupportedTemporalTypeException
B) P1Y
PT8784H
C) P1Y
UnsupportedTemporalTypeException
D) PT8784H
P1Y

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

3. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2 3
B) 1 2 3 4
C) 1 2 3
D) An exception is thrown.
E) Compilation fails.
F) 0 1 2

4. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) Nothing
B) An exception is thrown at runtime.
C) markdown
Inner class:
------------
Outer field
D) Compilation fails at line n1.
E) Compilation fails at line n2.

5. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var f = { 6 };
C) var a = 1;(Valid: var correctly infers int)
D) var h = (g = 7);
E) var b = 2, c = 3.0;
F) var e;

Solutions: