Implementing object-Oriented Programming with Java (10)

Look at the properties of the file:
System.out.println (F.getname ());//File name

System.out.println (F.length ());//byte size

System.out.println (F.getabsolutepath ());//absolute path

System.out.println (F.canread ());//Whether the file is readable

System.out.println (F.canwrite ());//whether writable

System.out.println (F.isdirectory ()); Whether it is a folder

File Related knowledge:

File F = new file ("D:/java/aaa.txt"); //Locate the target file

To create a file read object
Input byte stream for file
FileInputStream fis = new FileInputStream (f);

Read file
Byte[] B = new byte[(int) f.length ()];
If you read the last-1 means no more reading
General wording
int i = 0;
while ((i = Fis.read ())!=-1) {
System.out.println ((char) i);
//}

Advanced notation
Byte[] B = new byte[(int) f.length ()];
Reads all the contents of the file into a byte array.
Fis.read (b, 0, b.length);
for (int i = 0; i < b.length;i++) {
System.out.println ((char) b[i]);
}

Write
Output byte stream for file
FileOutputStream fos = new FileOutputStream ("C:/bbb.txt");
Input
Fos.write (b);

Fis.close ();
Empty the memory
Fos.flush ();
Fos.close ();

Wrap a byte stream into a character stream
CharSet American Character Set iso-8859-1
Give a character set of encoding format Chinese Utf-8
InputStreamReader ISR = new InputStreamReader (FIS, "utf-8");

Implementing object-Oriented Programming with Java (10)