Java Online Screening Test

Which of the following is true about Java garbage collection?

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

Which method of ConcurrentHashMap is atomic?

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

Which collection class allows concurrent modification by multiple threads?

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

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

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

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

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

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

Which stream operation is terminal?

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

Which functional interface does the forEach() method accept?

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

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

Which class in Java is immutable by design?

Which lock mechanism in Java provides explicit control over locking?

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

Which of the following is true about volatile in Java?