Overview

The main purpose of the Java FileInputStream class is to read streams of raw data from the file in the file system. The FileInputStream is a subclass of InputStream. InputStream is an abstract superclass.

public class FileInputStream extends InputStream
{

…

}

 

Constructors

The most used constructors of the class are as follows:

public FileInputStream(String name)

public FileInputStream(File file)

Methods

The important method is the read() method, which reads a byte of data from the input stream.

To improve performance, the read( byte[]) is used for reading the byte array. The byte array is read into a temporary buffer area in the main memory.

Example

FileInputStream fis = new FileInputStream(“input.txt”);

or

File file = new File(“input.txt”);

FileInputStream fis = new FileInputStream(file);

Sample Code

 

package com.testingdocs.streams;

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

/*
 * Program to demo FileInputStream class
 * Java Tutorials - www.TestingDocs.com
 */

public class FileReadDemo {

	public static void main(String[] args) throws IOException {
		FileInputStream fis = null;
		int b = 0;
		try{
			// create a file input stream object
			fis = new FileInputStream("input.txt");
			while((b = fis.read()) != -1 )
				System.out.println((char) b); // type cast
		}catch(Exception e) {
			e.printStackTrace();
		}
		finally {
			fis.close();
		}
	}
}

—

Java Tutorials

Java Tutorial on this website:

https://www.testingdocs.com/java-tutorial/

For more information on Java, visit the official website :

https://www.oracle.com/java/