while ( true )
{
data = instr.readUnsignedByte() ;
outstr.writeByte( data ) ;
}
Just three statements. But those statements are buried in 60 lines of code! This is often the case in programs, where a "tight little loop" does all the work, but the set-up takes many more lines.
File
Here is brief documentation for some useful methods in File.
There are many more useful methods. If there is something file related you wish to do, check the complete documentation.
| Methods of the File Class | |
|---|---|
| boolean canRead() |
Returns true if the file exists and can be read; otherwise returns false. |
| boolean canWrite() |
Returns true if the file exists and can be written; otherwise returns false. |
| boolean delete() |
Deletes the file or directory. Returns true on success; otherwise returns false. |
| boolean exists() |
Returns true if the file exists; otherwise returns false. |
| String getName() | Returns the file name or directory name. |
| String getPath() | Returns the path name. |
| boolean isDirectory() |
Returns true for an existing directory; otherwise returns false. |
| boolean isFile() |
Returns true for an existing file; otherwise returns false. |
| long length() | Returns the length of a file. |
| String[] list() |
Returns an array which lists the files and directories in the directory. If the File is not a directory or there is an I/O error, null is returned. |
| boolean mkdir() |
Creates the directory named in this File object. Returns true if successful, otherwise, false. |
(Brain teaser: ) Is it possible for isDirectory()
and isFile() both to
return false?