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Updated: Jul 01, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
Download Limit: Unlimited
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Oracle Java SE 21 Developer Professional Sample Questions:
1. Which of the following java.io.Console methods doesnotexist?
A) readPassword(String fmt, Object... args)
B) read()
C) reader()
D) readPassword()
E) readLine(String fmt, Object... args)
F) readLine()
2. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?
A) falsetruetrue
B) truefalsetrue
C) truetruetrue
D) truetruefalse
E) Compilation fails
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) An exception is thrown at runtime
B) Numbers from 1 to 1945 randomly
C) Numbers from 1 to 25 sequentially
D) Numbers from 1 to 25 randomly
E) Compilation fails
4. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?
A) 1
B) NotSerializableException
C) 2
D) ClassCastException
E) Compilation fails
5. Which of the following statements are correct?
A) You can use 'protected' access modifier with all kinds of classes
B) You can use 'public' access modifier with all kinds of classes
C) You can use 'private' access modifier with all kinds of classes
D) You can use 'final' modifier with all kinds of classes
E) None
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: B | Question # 3 Answer: D | Question # 4 Answer: D | Question # 5 Answer: E |
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