In this section you will learn how to read line by line data from a file using BufferedReader. In this section, we provide you two examples:
1. Read line by only using BufferedReader
2. Read line by using FileInputStream, DataInputStream, BufferedReader.

What is BufferedReader ?

BufferedReader buffer character to read characters, arrays and lines. It read text from a character-input stream. You can change the buffer size or can use default size.

package com.buffered;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main{
  public static void main(String[] args) {
    PressAnyKey();
  }  
  public static void PressAnyKey() {
	BufferedReader input =new BufferedReader
		(new InputStreamReader(System.in));
	System.out.print("Press any key...");
	try {
	input.readLine();    
	} 
	catch (Exception e) {
      e.printStackTrace();
    }
  }
}

What is in, out and err?

in is a static reference of java.io.InputStream class provided in System class out and err are static references of java.io.PrintStream class provided in System class.

Creating out own static references

import java.io.*;
import java.util.Scanner;
public class MyClass 
{
     static InputStreamReader isr=new InputStreamReader(System.in);
     static BufferedReader br=new BufferedReader(isr);
     static Scanner sc=new Scanner(System.in);
}

public class Mix 
{
    public static void main(String args[]) throws java.io.IOException
    {
        System.out.print("Name : ");
        String name=MyClass.br.readLine();
        System.out.print("Age : ");
        int age=MyClass.sc.nextInt();
       
        if(age>=18)
            System.out.printf("Dear %s you can vote",name);
        else
            System.out.printf("Dear %s you cannot vote",name);
    }
}