Java Online Screening Test

Which of the following is true about volatile in Java?

What will happen if a thread calls the wait() method inside a synchronized block?

What will happen if join() is called on a thread?

What will Optional.ofNullable(null).orElse("Default") return?

Which method is used to schedule a task for execution in ScheduledExecutorService?

What is the default capacity of an ArrayList when initialized with an empty constructor?

Which functional interface does the forEach() method accept?

Which class in Java is immutable by design?

Which Java class is designed for thread-safe counter updates?

Which of the following is true about Java garbage collection?

Which method of ConcurrentHashMap is atomic?

Which Java feature ensures that an object is not modified once it is created?

Which functional interface represents an operation that takes one argument and returns a result?

Which collection class allows concurrent modification by multiple threads?

What does the filter() method in Java Streams do?

Which of the following is not a valid access modifier in Java?

Which interface provides a method to retrieve elements sequentially from a collection?

Which stream operation is terminal?

Which lock mechanism in Java provides explicit control over locking?

Which Java collection class does not allow duplicate keys but allows duplicate values?