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Updated: Jun 02, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle Java SE 21 Developer Professional Sample Questions:
1. A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?
A) css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
B) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
C) css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D) bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
2. Which of the following statements is correct about a final class?
A) It must contain at least a final method.
B) It cannot implement any interface.
C) It cannot be extended by any other class.
D) The final keyword in its declaration must go right before the class keyword.
E) It cannot extend another class.
3. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
A) It prints "Task is complete" twice, then exits normally.
B) It prints "Task is complete" once and throws an exception.
C) It prints "Task is complete" once, then exits normally.
D) It prints "Task is complete" twice and throws an exception.
E) It exits normally without printing anything to the console.
4. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?
A) It's always 1
B) It's either 0 or 1
C) Compilation fails
D) It's either 1 or 2
E) It's always 2
5. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
A) 14
B) 10
C) 11
D) 12
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: D |
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