BufferedReader

Read line by line or char by char

Constructors

1. BufferedReader br = new BufferedReader("abc.txt"); ❌ // cannot directly communicate with data.
2. BufferedReader br = new BufferedReader(Reader r);
3. BufferedReader br = new BufferedReader(Reader r, int BufferSize);

Methods

1. int read()
2. int read(char[] ch)
3. void close() // 1, 2 3 are same as FileReader
4. String readline()
   • To insert line separator.

Examples

Text File

• A sample text file named "gces.txt".

  gces
  2019
  Happy New Year
  

Read File

• Read from "gces.txt" with BufferedReader.

  import java.io.FileReader;
  import java.io.IOException;
  import java.io.BufferedReader;
  
  class GCES {
      public static void main(String[] args) {
          try {
              BufferedReader br = new BufferedReader(new FileReader("gces.txt"));
              int i = br.read(); // Reads the character and stores in integer value - Unicode
              while (i != -1) { // Denotes no character
                  System.out.print((char) i); // Type hinting
                  i = br.read(); // Iteratively reads the character one by one until loop terminates.
              }
              br.close();
          } catch (IOException error) {
              error.printStackTrace();
          }
      }
  }
  

Read File With ReadLine

• Read from "gces.txt" with BufferedReader using readLine() method..

  import java.io.FileReader;
  import java.io.IOException;
  import java.io.BufferedReader;
  
  class GCES {
      public static void main(String[] args) {
          try {
              BufferedReader br = new BufferedReader(new FileReader("gces.txt"));
              int i = br.read(); // Reads the character and stores in integer value - Unicode
              while (i != -1) { // Denotes no character
                  System.out.print((char) i); // Type hinting
                  i = br.read(); // Iteratively reads the character one by one until loop terminates.
              }
              br.close();
          } catch (IOException error) {
              error.printStackTrace();
          }
      }
  }