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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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. MMMM dd
B. MM dd
C. MM d
D. MMM dd

Question 2

Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A. An ArrayIndexOutOfBoundsException is thrown at runtime.
B. Compilation fails.
C. Chanel
D. Chanel Dior Louis Vuitton

Question 3

Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A. Compilation fails
B. An exception is thrown at runtime
C. Numbers from 1 to 25 sequentially
D. Numbers from 1 to 25 randomly
E. Numbers from 1 to 1945 randomly

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

Question 5

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A. Compilation fails
B. {a=1, b=2, c=3}
C. {b=1, c=2, a=3}
D. {c=1, b=2, a=3}
E. {a=3, b=1, c=2}
F. {b=1, a=3, c=2}
G. {c=2, a=3, b=1}

Solutions: