13.7. finally Block
Programs that obtain certain types of resources must return them to the system explicitly to avoid so-called resource leaks. In programming languages such as C and C++, the most common kind of resource leak is a memory leak. Java performs automatic garbage collection of memory no longer used by programs, thus avoiding most memory leaks. However, other types of resource leaks can occur. For example, files, database connections and network connections that are not closed properly might not be available for use in other programs.
Error-Prevention Tip 13.7
A subtle issue is that Java does not entirely eliminate memory leaks. Java ...