Practice Questions

Which module directive allows reflection access at runtime?

A. requires B. exports C. opens D. uses

What is the result of this stream operation? Stream.of(1,2,3).map(i -> i * 2).filter(i -> i > 2).count();

A. 1 B. 2 C. 3 D. 0

Which interface represents a function that takes one argument and returns a result?

A. Supplier B. Consumer C. Function D. Predicate

What happens if a thread calls wait() without owning the monitor?

A. Compilation error B. Runtime exception C. Deadlock D. No effect

Which class is used to read a file line by line efficiently?

A. FileReader B. BufferedReader C. Scanner D. InputStream

Which collection does not allow duplicates?

A. List B. Map C. Set D. Queue