Dark Horse Programmer-Learn notes character stream related

1.FileWriter

FileWriter FW = new FileWriter ("Demo.txt");

Fw.writer ("ABCDE");
Fw.flush ();
Fw.close ();

The writer () method simply writes the data to the memory (stream);
Flush (): The data in the current stream is brushed into the destination (demo.txt).

If the FW (stream) is not closed, write the data repeatedly using the writer () method.

Close (): Closes this stream, but refreshes the data in the cache first.

Flush () and close (): Flush () After execution, the current stream can continue to be used, and close () Z will close the stream after execution.

2.IO Exception Handling methods

Either read or write, as long as the resource on the operating device can produce an exception.

Creates a reference outside and initializes it in a try catch block. As follows:
FileWriter FW = NULL;
try{
FW = new FileWriter ("D:\\demo.txt");
}

Full IO exception handling process:

NULL ; Try  New FileWriter ("D:\\demo.txt");} Catch (ioexcetption e) {e.printstacktrace ();} finally {  try  {  if(null !=catch(　　Ioexcetption e) {e.printstacktrace (); }}

Dark Horse Programmer-Learn notes character stream related