FileReader vs BufferedReader in Java: Key Differences and Usage

FileReader reads characters directly from a file, while BufferedReader wraps around a Reader like FileReader to read text efficiently by buffering input. Use BufferedReader for faster reading and convenient methods like readLine().

Quick Comparison

This table summarizes the main differences between FileReader and BufferedReader in Java.

Factor	FileReader	BufferedReader
Purpose	Reads characters from a file	Reads text efficiently by buffering input
Buffering	No buffering, reads one char at a time	Uses buffer to reduce I/O operations
Common Use	Basic character reading	Reading lines or large text efficiently
Performance	Slower for large files	Faster due to buffering
Methods	read(), close()	readLine(), read(), close()
Typical Usage	Direct file reading	Wraps FileReader or other Readers

Key Differences

FileReader is a simple class that reads characters from a file one at a time. It does not use any internal buffer, so each read operation may cause a direct interaction with the file system, which can be slow for large files.

BufferedReader is designed to improve reading efficiency by wrapping around another Reader like FileReader. It reads a larger block of characters into an internal buffer at once, then serves characters from this buffer, reducing the number of expensive file system calls.

Additionally, BufferedReader provides convenient methods like readLine() to read an entire line of text at once, which FileReader does not offer. This makes BufferedReader more suitable for reading text files line by line.

Code Comparison

java

import java.io.FileReader;
import java.io.IOException;

public class FileReaderExample {
    public static void main(String[] args) {
        try (FileReader fr = new FileReader("example.txt")) {
            int ch;
            while ((ch = fr.read()) != -1) {
                System.out.print((char) ch);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Output

Hello, this is example text.
It has multiple lines.

BufferedReader Equivalent

java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class BufferedReaderExample {
    public static void main(String[] args) {
        try (BufferedReader br = new BufferedReader(new FileReader("example.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Output

Hello, this is example text.
It has multiple lines.

When to Use Which

Choose FileReader when you need simple, direct character reading from a file and performance is not critical, such as reading small files or single characters.

Choose BufferedReader when reading large files or when you want to read text line by line efficiently. It improves performance by buffering input and provides useful methods like readLine() that simplify code.

Key Takeaways

Use BufferedReader for efficient reading and line-by-line processing.

FileReader reads characters directly without buffering, which can be slower.

BufferedReader wraps FileReader to add buffering and convenience methods.

For large files or text processing, prefer BufferedReader.

For simple or small reads, FileReader may suffice.