Table of Content

In the last chapter we have seen the FileInputStream and now in this chapter we will be learning about FileOutputStream.

Java FileOutputStream : Byte Streams

1. FileOutputStream is used to write bytes to the file.
2. The Java.io.FileOutputStream class is used to write bytes to the file
3. FileOutputStream is usually used for writing content to the file

Program : Java FileOutputStream - Byte Streams

package com.c4learn.stream;
import java.io.*;
class WriteFile {
  public static void main(String args[]) {
    try {
      String msg = "Java is Easy and Simple.";  	
      FileOutputStream fout = new 
            FileOutputStream("src/files/output.txt");
      byte ch[] = msg.getBytes();  
      fout.write(ch); 
      fout.close();  
      System.out.println("String written to File");
    } catch (Exception e) {
      System.out.println(e);
    }
  }
}

Output :

String written to File

and File contents of output.txt -

Java is Easy and Simple.

Explanation :

We have created one object for FileOutputStream class which is used to write stream of data to file.

FileOutputStream fout = new 
            FileOutputStream("src/files/output.txt");

Now we need to read the content of the string and copy them into the byte array. getBytes() method encodes string into a sequence of bytes and stores the result into a new byte array.

byte ch[] = msg.getBytes();  

After that we need to write the content to the file using following line of code -

fout.write(ch);