Java.io.ObjectInputStream.readFully Byte len() 方法

package com.codingdict;



import java.io.*;



public class ObjectInputStreamDemo {



   public static void main(String[] args) {

      String s = "Hello World";



      try {



         // create a new file with an ObjectOutputStream

         FileOutputStream out = new FileOutputStream("test.txt");

         ObjectOutputStream oout = new ObjectOutputStream(out);



         // write something in the file

         oout.writeUTF(s);

         oout.flush();



         // create an ObjectInputStream for the file we created before

         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));



         // read and print from index 0 to 7

         byte[] b = new byte[13];

         ois.readFully(b, 0, 7);

         String array = new String(b);

         System.out.println("" + array);



      } catch (Exception ex) {

         ex.printStackTrace();

      }



   }

}