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Updated: May 29, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
A) {}
B) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
C) Compilation fails.
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) An exception is thrown at runtime.
2. Which of the following statements are correct?
A) You can use 'protected' access modifier with all kinds of classes
B) You can use 'private' access modifier with all kinds of classes
C) You can use 'final' modifier with all kinds of classes
D) None
E) You can use 'public' access modifier with all kinds of classes
3. Which of the following doesnotexist?
A) Supplier<T>
B) DoubleSupplier
C) BiSupplier<T, U, R>
D) They all exist.
E) LongSupplier
F) BooleanSupplier
4. 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) PT8784H
P1Y
D) P1Y
UnsupportedTemporalTypeException
5. Which of the followingisn'ta correct way to write a string to a file?
A) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
B) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
C) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
D) None of the suggestions
E) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
F) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: F |
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