How to lock with ReentrantLock?

Question

I would expect the following test to only print \"has been locked\" once. BUT it consequently prints the line.

public class LocKTest {
    @Test
    public void          


        

Answer 1

The name is ReentrantLock, meaning you can re-enter if you already own the lock.

If you wish to have the thread block, you could use for example a Semaphore with 1 (or more) permits.