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Buffered streams can improve performance by reducing the number of I/O operations. Here's an example:

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class BufferedStreams 
    public static void main(String[] args) 
        try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream("input.txt"));
             BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("output.txt"))) 
            int byteValue;
            while ((byteValue = bis.read()) != -1) 
                bos.write(byteValue);
catch (IOException e) 
            System.err.println("Error using buffered streams: " + e.getMessage());

To write to a file, you can use the following code:

import java.io.FileOutputStream;
import java.io.IOException;
public class WriteToFile 
    public static void main(String[] args) 
        try (FileOutputStream fos = new FileOutputStream("example.txt")) 
            String data = "Hello, World!";
            fos.write(data.getBytes());
         catch (IOException e) 
            System.err.println("Error writing to file: " + e.getMessage());