Java.io.FileOutputStream.write() Method

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Description

The java.io.FileOutputStream.write(byte[] b, int off, int len) method writes len bytes from the specified byte array starting at offset off to this file output stream.

Declaration

Following is the declaration for java.io.FileOutputStream.write(byte[] b, int off, int len) method:

public void write(byte[] b, int off, int len)

Parameters

  • b -- the source buffer.

  • off -- the start offset in the data.

  • len -- the number of bytes to write.

Return Value

This method does not return any value.

Exception

  • IOException - if any I/O error occurs.

Example

The following example shows the usage of java.io.FileOutputStream.write(byte[] b, int off, int len) method.

package com.tutorialspoint;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileOutputStreamDemo {
   public static void main(String[] args) throws IOException {
      
      FileOutputStream fos = null;
      FileInputStream fis = null;
      byte[] b = {65,66,67,68,69};
      int i=0;
      char c;
      
      try{
         // create new file output stream
         fos=new FileOutputStream("C://test.txt");
         
         // writes byte to the output stream
         fos.write(b, 2, 3);
         
         // flushes the content to the underlying stream
         fos.flush();
         
         // create new file input stream
         fis = new FileInputStream("C://test.txt");
         
         // read till the end of the file
         while((i=fis.read())!=-1)
         {
            // convert integer to character
            c=(char)i;
            
            // prints
            System.out.print(c);
         }
      }catch(Exception ex){
         // if an error occurs
         ex.printStackTrace();
      }finally{
         
         // closes and releases system resources from stream
         if(fos!=null)
            fos.close();
         if(fis!=null)
            fis.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

CDE



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