Java之字节输入流和输出流

package IODemo;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class OutputStreamAndInputStream {

 /**

  * @param args

  * @throws IOException

  */

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

  demo1();

  demo2();

  demo3();

 }

 private static void demo3() throws IOException {

  FileInputStream fis = new FileInputStream("Demo.txt");

  byte buf[] = new byte[10];

  int len = 0;

  while ((len = fis.read(buf)) != -1) {

   System.out.println(new String(buf, 0, len));

  }

 }

 private static void demo2() throws IOException {

  FileOutputStream fos = new FileOutputStream("Demo.txt");

  fos.write("abcd".getBytes());

 }

 private static void demo1() throws IOException {

  FileInputStream fis = new FileInputStream("Demo.txt");

  int ch = 0;

  while ((ch = fis.read()) != -1) {

   System.out.println((char) ch);

  }

 }

}