IO流学习

字节流：FileInputStream , FileOutputStream

public class IOdemo {

public static void main(String[] args) throws IOException {

File file = new File("F:\\hehe.txt");
FileInputStream in = new FileInputStream(file);
File f = new File("2.txt");
byte[] str = new byte[100];
in.read(str);//读文件信息
String s = new String(str);
System.out.println(s);
in.close();

File file1 = new File("F:\\hello.txt");
FileOutputStream out = new FileOutputStream(file1);
byte[] b = new byte[100];
String data = new String("hello wrold");
b = data.getBytes();
out.write(b);//写文件信息
out.close();

}

}

字符流：FileReader , FileWriter

字节流转字符流：InputStreamReader,OutputStreamWriter

缓冲流（字符串）：BufferedReader , BufferedWriter

键盘输入流：System.in , 属于字节输入流

键盘输出流：System.out , 属于字节输出流

数据类型流：DataInputStream,DataOutputStream（字节流）

对象流：ObjectInputStream,ObjectOutputStream（字节流）