How do I read a file in Java?

How do I read a file in Java?

You can use the BufferedReader class to read a file in Java. Here's a simple example:

import java.io.*;

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

What if the file doesn't exist?

If the file doesn't exist, a FileNotFoundException will be thrown. You can handle this exception using a try-catch block.

Can I read a file line by line?

Yes, the BufferedReader allows you to read a file line by line using the readLine() method, as shown in the example.

How do I write to a file in Java?

You can use the FileWriter class to write to a file. Here's a quick example:

import java.io.*;

public class FileWriteExample {
    public static void main(String[] args) {
        try (FileWriter writer = new FileWriter("output.txt")) {
            writer.write("Hello, World!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}