有人可以向我解释为什么我可以将FileInputStream或FileReader用于BufferedReader吗?有什么不同?同时,与BufferedReader相比,扫描仪有什么优势?我在读它对标记化有帮助,但这是什么意思?
try {
//Simple reading of bytes
FileInputStream fileInputStream = new FileInputStream("path to file");
byte[] arr = new byte[1024];
int actualBytesRead = fileInputStream.read(arr, 0, arr.length);
//Can read characters and lines now
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fileInputStream));
String lineRead = bufferedReader.readLine();
char [] charArrr = new char[1024];
int actulCharsRead = bufferedReader.read(charArrr, 0, charArrr.length);
//File reader allows reading of characters from a file
FileReader fileReader = new FileReader("path to file");
actulCharsRead = fileReader.read(charArrr, 0, charArrr.length);
//It is a good idea to wrap a bufferedReader around a fileReader
BufferedReader betterFileReader = new BufferedReader(new FileReader(""));
lineRead = betterFileReader.readLine();
actulCharsRead = betterFileReader.read(charArrr, 0, charArrr.length);
//allows reading int, long, short, byte, line etc. Scanner tends to be very slow
Scanner scanner = new Scanner("path to file");
//can also give inputStream as source
scanner = new Scanner(System.in);
long valueRead = scanner.nextLong();
//might wanna check out javadoc for more info
} catch (IOException e) {
e.printStackTrace();
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系 [email protected] 删除。
我来说两句