I/O stream

File

File f =new File()path
getPath()
delete()
exists()
list()

byte

InputStream or OutputStream (abstract

FileInputStream/FileOutputStream

FileInputStream i=new FileInputStream(path or File)
read()/write() //one byte
read(byte b[])/write(byte[]b)
close()

FilterInputStream

DataInputstream or.. 转换

OutputStream fos=new FileOutputStream(path) // FileOutputStream fos=new FileOutputStream(path) 
DataOutputStrean dos =new DataOutputStrean(fos)
readInt()/writeDouble() # one unit
#####BufferedInputStream
flush()
read(byte b[])   write(byte[] b)

PrintStream

FileOutputStream fos=new FileOutputStream(path or File)
PrintStream ps=new PrintStream(fos)
print()
println()

char

Reader ###Writer

InputStreamReader / OutputStreamWriter

FileOutputStream fos=new FileOutputStream(path or File)
Writer ow=new OutputStreamWriter(fos)  //字节转字符！

FileReader/FileWriter

实质还是字节输入输出类转换

FileReader fr=new FileReader(path or File)
//InputStreamReader子类实质还是字节转
read() write()

BufferedWriter/Reader

PrintWriter

RandomAccessFile

感觉这个挺有用

RandomAccessFile rf=new RandomAccessFile(path/File,"r/rw")
read()write()
seek() pointer