Java.io.PushbackInputStream.unread Byte len() 方法

package com.codingdict;



import java.io.*;



public class PushbackInputStreamDemo {



   public static void main(String[] args) {



      // declare a buffer and initialize its size:

      byte[] arrByte = new byte[1024];



      // create an array for our message

      byte[] byteArray = new byte[]{'H', 'e', 'l', 'l', 'o',};





      // create object of PushbackInputStream class for specified stream

      InputStream is = new ByteArrayInputStream(byteArray);

      PushbackInputStream pis = new PushbackInputStream(is, 10);



      try {



         // read from the buffer one character at a time

         for (int i = 0; i < byteArray.length; i++) {



            // read a char into our array

            arrByte[i] = (byte) pis.read();



            // display the read byte

            System.out.print((char) arrByte[i]);

         }



         // change line

         System.out.println();



         // create a new byte array to be unread

         byte[] b = {'W', 'o', 'r', 'l', 'd'};



         // unread the byte array

         pis.unread(b, 2, 3);



         // read again from the buffer one character at a time

         for (int i = 0; i < 3; i++) {



            // read a char into our array

            arrByte[i] = (byte) pis.read();



            // display the read byte

            System.out.print((char) arrByte[i]);

         }



      } catch (Exception ex) {

         ex.printStackTrace();

      }

   }

}