Java FileOutputStream Class

Java FileOutputStream is an output stream used for writing data to a file.

If you have to write primitive values into a file, use FileOutputStream class. You can write byte-oriented as well as character-oriented data through FileOutputStream class. But, for character-oriented data, it is preferred to use FileWriter than FileOutputStream.

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FileOutputStream class declaration

Let's see the declaration for Java.io.FileOutputStream class:

1. public class FileOutputStream extends OutputStream  
2. 
   

Java FileOutputStream Example 1: write byte

1. import java.io.FileOutputStream;  
2. public class FileOutputStreamExample {  
3.     public static void main(String args[]){    
4.            try{    
5.              FileOutputStream fout=new FileOutputStream("D:\\testout.txt");    
6.              fout.write(65);    
7.              fout.close();    
8.              System.out.println("success...");    
9.             }catch(Exception e){System.out.println(e);}    
10.       }    
11. }  

Output:

Success...

The content of a text file testout.txt is set with the data A.

testout.txt

A

Java FileOutputStream example 2: write string

1. import java.io.FileOutputStream;  
2. public class FileOutputStreamExample {  
3.     public static void main(String args[]){    
4.            try{    
5.              FileOutputStream fout=new FileOutputStream("D:\\testout.txt");    
6.              String s="Welcome to javaTpoint.";    
7.              byte b[]=s.getBytes();//converting string into byte array    
8.              fout.write(b);    
9.              fout.close();    
10.              System.out.println("success...");    
11.             }catch(Exception e){System.out.println(e);}    
12.       }    
13. }  

Output:

Success...

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