Difference between revisions of "IO"
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| − | == | + | == Basic Classes == |
| + | * The File class is an abstract representation of '''files and directory pathnames'''. It works at a higher level, cant be used to read/write data. | ||
| + | * FileReader - read character levels - variety of read() methods. Usually wrapped in a BufferedReader. | ||
| + | * BufferedReader - Reads large chunks of files and keeps it in the buffer. Subsequent requests are got from the buffer thus minimizing the number of times time intensive file IO is performed. | ||
| + | * Similarly: | ||
| + | * FileWriter - write to character files. | ||
| + | * BufferedWriter - Keeps data in buffer and writes large chunks of buffer to file at once, minimizing file IO. | ||
| + | * PrintWriter - Has a lot of convenience methods and constructors (takes a File or String etc). Methods like format(), printf() and append() make PrintWriters powerful. | ||
| + | * Remember: | ||
| + | * '''For Characters''' - Reader and Writer classes are used. | ||
| + | * '''For Bytes''' - Stream classes are used. | ||
[[Category:OCPJP]] | [[Category:OCPJP]] | ||
Revision as of 21:26, 17 August 2011
Basic Classes
- The File class is an abstract representation of files and directory pathnames. It works at a higher level, cant be used to read/write data.
- FileReader - read character levels - variety of read() methods. Usually wrapped in a BufferedReader.
- BufferedReader - Reads large chunks of files and keeps it in the buffer. Subsequent requests are got from the buffer thus minimizing the number of times time intensive file IO is performed.
- Similarly:
- FileWriter - write to character files.
- BufferedWriter - Keeps data in buffer and writes large chunks of buffer to file at once, minimizing file IO.
- PrintWriter - Has a lot of convenience methods and constructors (takes a File or String etc). Methods like format(), printf() and append() make PrintWriters powerful.
- Remember:
- For Characters - Reader and Writer classes are used.
- For Bytes - Stream classes are used.
