What is the correct code to read a text file in Java?

Here is a simple example of how to read a text file in Java using the BufferedReader class:

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

public class ReadFile {
    public static void main(String[] args) {
        BufferedReader reader;
        try {
            reader = new BufferedReader(new FileReader("filename.txt"));
            String line = reader.readLine();
            while (line != null) {
                System.out.println(line);
                // read next line
                line = reader.readLine();
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this code:

1. We first import the necessary classes.
2. We create a new BufferedReader object and pass a new FileReader object with the filename as a parameter.
3. We read the first line using the readLine() method and store the result in a variable.
4. We then enter a while loop that continues until readLine() returns null, which means the end of the file has been reached.
5. Inside the loop, we print out the line read by the reader, and then read the next line.
6. After the loop, we close the reader using the close() method.
7. If an IOException occurs at any point, we catch it and print the stack trace.