28io stream, byte output stream writes multiple bytes

write（） Yes 3 individual   Write data to hard disk

  write（byte[] b） take b.length Bytes from specified Of byte Array Write this output stream

public void' write(byte[] b): take b.length Byte writes this output stream from the specified byte array
  If the first byte written is a positive number （0-127）, Then the display will query ASCII surface
  If the first byte written is negative , The first byte and the second byte will form a Chinese display , Query the system default code table （GBK）

  write（byte[] b,int off,int len ） Writes the specified byte array to len Bytes , From the offset off Start the output stream to this

 public void write（byte [] b,int off,int len）: Write part of the byte array to a file
   int off： Start index of array
   int len： Write a few bytes
   The specified byte array is written len byte , From the offset off Start output to this output stream

  write（int b） Output the specified byte stream   Write a byte

/*
Write character method ： have access to String The methods in the class put the string , Convert to byte array
  byte[] getByte() Convert string to byte array
 */
byte[] byte2=" Hello ".getBytes();
System.out.println(Arrays.toString(byte2));//[-28, -67, -96, -27, -91, -67]  Coding format UTF-8 inside 3 A byte is a Chinese character ,JDK in 2 A byte is a Chinese character
fos.write(byte2);

Detailed code ：

package demo28 Byte output stream writes multiple bytes ;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Array;
import java.util.Arrays;

public class DenoOutputStream {
    public static void main(String[] args) throws IOException {
        //1. Create a FileOutputStream object , The destination to which the data is to be written in the constructor 
        FileOutputStream fos=new FileOutputStream(new File("E:\\ Multithreading \\b.txt"));
        //2. call FileOutputStream Object write Method to write data to a file 
        // Write in file 100, Need to write 3 Bytes 
        fos.write(49);
        fos.write(48);
        fos.write(48);

        /*
        public void' write(byte[] b): take b.length Byte writes this output stream from the specified byte array 
           If the first byte written is a positive number （0-127）, Then the display will query ASCII surface 
           If the first byte written is negative , The first byte and the second byte will form a Chinese display , Query the system default code table （GBK）
         */
        byte [] bytes={65,66,67,68,69};//ABCDE
        byte [] bytess={-65,-66,-67,68,69};
        //fos.write(bytess);// Grill E
        fos.write(bytes);//ABCDE
        /*
        public void write（byte [] b,int off,int len）: Write part of the byte array to a file 
           int off： Start index of array 
           int len： Write a few bytes 
            The specified byte array is written len byte , From the offset off Start output to this output stream 
         */
        fos.write(bytes,1,2);// Put a part of the array ,BC write in 

        /*
         Write character method ： have access to String The methods in the class put the string , Convert to byte array 
          byte[] getByte()  Convert string to byte array 
         */
        byte[] byte2=" Hello ".getBytes();
        System.out.println(Arrays.toString(byte2));//[-28, -67, -96, -27, -91, -67]   Coding format UTF-8 inside 3 A byte is a Chinese character ,JDK in 2 A byte is a Chinese character 
        fos.write(byte2);

        // Release resources 
        fos.close();
    }
}

result ： establish b.txt, Write data

At the beginning

  After running the code ：