Buffered Streams

title: Buffered Streams in Java description: BufferedReader aur BufferedWriter for performance

Buffering se I/O performance improve hoti hai — disk reads kam hote hain.

BufferedWriter

java exampleWoHoTech

try (BufferedWriter bw = new BufferedWriter(new FileWriter("data.txt"))) {
    bw.write("Line 1");
    bw.newLine(); // Platform-independent newline
    bw.write("Line 2");
    bw.newLine();
    bw.write("Line 3");
    // flush() hota hai automatically on close
}

BufferedReader — Line by line read

java exampleWoHoTech

// readLine() — Most common way to read text files
try (BufferedReader br = new BufferedReader(new FileReader("data.txt"))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
}

// Java 8+ lines() — Stream
try (BufferedReader br = new BufferedReader(new FileReader("data.txt"))) {
    br.lines()
      .filter(line -> !line.isEmpty())
      .forEach(System.out::println);
}

Files.readAllLines() — Simplest (Java 7+)

java exampleWoHoTech

import java.nio.file.*;
import java.nio.charset.StandardCharsets;

List<String> lines = Files.readAllLines(Path.of("data.txt"), StandardCharsets.UTF_8);
lines.forEach(System.out::println);

// Write all lines
List<String> content = Arrays.asList("Line 1", "Line 2", "Line 3");
Files.write(Path.of("output.txt"), content, StandardCharsets.UTF_8);

Performance Comparison

java exampleWoHoTech

// Without buffering — slow (disk hit every read)
FileReader fr = new FileReader("large.txt");

// With buffering — fast (reads chunk at a time)
BufferedReader br = new BufferedReader(new FileReader("large.txt"), 8192); // 8KB buffer

title: Buffered Streams in Java description: BufferedReader aur BufferedWriter for performance

Buffering se I/O performance improve hoti hai — disk reads kam hote hain.

BufferedWriter

java exampleWoHoTech

try (BufferedWriter bw = new BufferedWriter(new FileWriter("data.txt"))) {
    bw.write("Line 1");
    bw.newLine(); // Platform-independent newline
    bw.write("Line 2");
    bw.newLine();
    bw.write("Line 3");
    // flush() hota hai automatically on close
}

BufferedReader — Line by line read

java exampleWoHoTech

// readLine() — Most common way to read text files
try (BufferedReader br = new BufferedReader(new FileReader("data.txt"))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
}

// Java 8+ lines() — Stream
try (BufferedReader br = new BufferedReader(new FileReader("data.txt"))) {
    br.lines()
      .filter(line -> !line.isEmpty())
      .forEach(System.out::println);
}

Files.readAllLines() — Simplest (Java 7+)

java exampleWoHoTech

import java.nio.file.*;
import java.nio.charset.StandardCharsets;

List<String> lines = Files.readAllLines(Path.of("data.txt"), StandardCharsets.UTF_8);
lines.forEach(System.out::println);

// Write all lines
List<String> content = Arrays.asList("Line 1", "Line 2", "Line 3");
Files.write(Path.of("output.txt"), content, StandardCharsets.UTF_8);

Performance Comparison

java exampleWoHoTech

// Without buffering — slow (disk hit every read)
FileReader fr = new FileReader("large.txt");

// With buffering — fast (reads chunk at a time)
BufferedReader br = new BufferedReader(new FileReader("large.txt"), 8192); // 8KB buffer

Buffered Streams

BufferedWriter

BufferedReader — Line by line read

Files.readAllLines() — Simplest (Java 7+)

Performance Comparison

Continue learning this concept

Buffered Streams

BufferedWriter

BufferedReader — Line by line read

Files.readAllLines() — Simplest (Java 7+)

Performance Comparison

Continue learning this concept