P4
A DESCRIPTION OF THE PROBLEM :
See https://download.java.net/java/early_access/jdk15/docs/api/java.base/java/util/concurrent/locks/ReentrantLock.html
In the example in the class-level Javadoc, the statement `lock.unlock()` is missing a semicolon.
See https://download.java.net/java/early_access/jdk15/docs/api/java.base/java/util/concurrent/locks/ReentrantLock.html
In the example in the class-level Javadoc, the statement `lock.unlock()` is missing a semicolon.
