Interacting with Filesystems - Beginning Java 7 - page 723

1-9009-3323-4x | Wiper Blade Micro

Edge | 30 | 24.68

1-3233-44923-7j | Parking Brake

Cable | 5 | 19.95

2-3399-6693-2m | Halogen Bulb H4 55/

60W | 22 | 8.13

2-599-2029-6k | Turbo Oil Line O-

Ring | 26 | 1.55

3-1299-3299-9u | Air Pump Elec-

tric | 9 | 202.00

Number of records = 5
Listing 8-7 relies on the try-with-resources statement to simplify the code—notice
try (PartsDB pdb = new PartsDB("parts.db")) . To observe a sup-
pressedexception, uncomment thethrowstatement in Listing8-6 's close() method
(makesuretocommentout raf.close(); inthatmethodorthecompilerwillcom-
plainaboutunreachablecode),anduncommentthethrowstatementin Listing8-7 'stry
block.Thistime,whenyouruntheapplication,you'llnoticethefollowingtwolinesat
the end of the output:
java.io.IOException: I/O error
Suppressed = java.io.IOException: cannot close raf
Andthereyouhaveit:asimpleflatfiledatabase.Despiteitslackofsupportforad-
vanceddatabasefeaturessuchastransactionmanagement,aflatfiledatabasemightbe
all that your application requires.

Note Tolearnmoreaboutflatfiledatabases,checkoutWikipedia's“Flatfiledata-
base” entry ( http://en.wikipedia.org/wiki/Flat_file_database ).

Streams

Alongwith File and RandomAccessFile ,JavausesstreamstoperformI/Ooper-
ations.A stream isanorderedsequenceofbytesofarbitrarylength.Bytesflowoveran
output stream fromanapplicationtoadestination,andflowoveran input stream from
a source to an application. Figure 8-2 illustrates these flows.