In Java, the BufferedReader class is a type of Reader that reads characters from a stream and stores them in a buffer, which allows for efficient reading of characters, arrays, and lines. The BufferedReader class is often used to read text from a file or from the standard input stream (System.in).

Here is an example of how to use a BufferedReader to read a file in Java:

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

public class Main {
  public static void main(String[] args) {
    // Open the file for reading
    try (BufferedReader reader = new BufferedReader(new FileReader("file.txt"))) {
      // Read a line from the file
      String line = reader.readLine();

      // Print the line to the console
      System.out.println(line);
    } catch (IOException e) {
      // An error occurred, print the stack trace
      e.printStackTrace();
    }
  }
}

This code creates a BufferedReader that reads from the file file.txt and reads a line from the file using the readLine() method. It then prints the line to the console.

The BufferedReader class also provides other methods for reading from a stream, such as read() for reading a single character, read(char[] cbuf) for reading an array of characters, and read(char[] cbuf, int off, int len) for reading a portion of an array of characters.

For more information on the BufferedReader class and how to use it in Java, you can refer to the Java documentation:

• BufferedReader: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/BufferedReader.html
• Reader: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Reader.html