<div class="image-550">
<img src="https://cdn.kahimyang.com/resources-24/java-io.avif" alt="Java I/O" loading="lazy" />
</div>

<h4>
Overview of java.io
</h4>
<p>
The java.io package has been part of Java since its inception. It provides classes for system input and output through data streams, serialization, and file system operations. The java.io package is based on a stream-oriented approach, making it simple and easy to use.
</p>
<h5>
Reading a File with java.io
</h5>
</p>
<pre style="font-size: 90%;">
<code class="language-java normalize-whitespace line-numbers" >
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileExampleIO {
    public static void main(String[] args) {
        String filePath = "example.txt";
        
        try (BufferedReader reader = new BufferedReader(
                new FileReader(filePath))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
</code>
</pre>
<p>
In the example above, although java.io is generally stream-based, BufferedReader adds an additional layer of buffering, which improves performance when reading text from a character input stream (FileReader).  The same is true to the BufferedWriter in the next example.
</p>

<h5>
Writing to a File with java.io
</h5>
<pre style="font-size: 90%;">
<code class="language-java normalize-whitespace line-numbers" >
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class WriteFileExampleIO {
    public static void main(String[] args) {
        String filePath = "example.txt";
        String content = "Hello, world!";
        
        try (BufferedWriter writer = new BufferedWriter(
                      new FileWriter(filePath))) {
            writer.write(content);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
</code>
</pre>


Comparing java.io and java.nio for File I/O in Java