Java FileInputStream Class

The FileInputStream class in Java is used to read data from a file in the form of bytes. It’s ideal for reading binary data such as images or audio files. For reading text files, it’s better to use FileReader.

• Direct Access: It directly reads the file content from the disk without buffering
• Platform Independent: It can work on any operating system

Declaration

The FileInputStream class extends the InputStream class, which means it inherits methods for reading raw byte data from files.

public class FileInputStream extends InputStream

Example: FileInputStream class to read data from file.

Output:

Constructors ofFileInputStream Class

1. FileInputStream(String name)

Creates an input file stream to read from a file with the specified name. 

FileInputStream fi = new FileInputStream("example.txt");

2. FileInputStream(File file)

Creates an input file stream to read from the specified File object. 

File f = new File("example.txt");
FileInputStream fi = new FileInputStream(f);

3. FileInputStream(FileDescriptor fdobj)

Creates an input file stream to read from the specified file descriptor. 

FileDescriptor fd = FileDescriptor.in;
FileInputStream fi = new FileInputStream(fd); 

Read Data from a File Using FileInputStream

Create a file named file.txt in your project directory with the following content:

this is my first code
this is my second code

Output:

Methods of JavaFileInputStream Class