Java FileInputStream Class

Java FileInputStream class obtains input bytes from a file. It is used for reading byte-oriented data (streams of raw bytes) such as image data, audio, video etc. You can also read character-stream data. But, for reading streams of characters, it is recommended to use FileReader class.

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Java FileInputStream class declaration

Let's see the declaration for java.io.FileInputStream class:

1. public class FileInputStream extends InputStream  

Java FileInputStream example 1: read single character

1. import java.io.FileInputStream;  
2. public class DataStreamExample {  
3.      public static void main(String args[]){    
4.           try{    
5.             FileInputStream fin=new FileInputStream("testout.txt");    
6.             int i=fin.read();  
7.             System.out.print((char)i);    
8.   
9.             fin.close();    
10.           }catch(Exception e){System.out.println(e);}    
11.          }    
12.         }  

Note: Before running the code, a text file named as "testout.txt" is required to be created. In this file, we are having following content:

Welcome to java .

After executing the above program, you will get a single character from the file which is 87 (in byte form). To see the text, you need to convert it into character.

Output:

W

Java FileInputStream example 2: read all characters

1.   
2.   
3. import java.io.FileInputStream;  
4. public class DataStreamExample {  
5.      public static void main(String args[]){    
6.           try{    
7.             FileInputStream fin=new FileInputStream("testout.txt");    
8.             int i=0;    
9.             while((i=fin.read())!=-1){    
10.              System.out.print((char)i);    
11.             }    
12.             fin.close();    
13.           }catch(Exception e){System.out.println(e);}    
14.          }    
15.         }  

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