BufferReaderとBufferInputStreamの違いと使い方

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) throws IOException {
	   Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(new FileInputStream("resource/A.in"))));
	   //BufferedReader             ，BufferedReader(Reader in)，
	   //new BufferedReader(new InputStream(new FileInputStream("resource/A.in")))    
		while(sc.hasNextLine())
	   {
		   String str=sc.nextLine();
		   System.out.println(str);
	   }
         }              
		 
	}