Apache FileUtils class provides General file manipulation utilities, All the methods in this class that read a stream are buffered internally. This means that there is no cause to use a BufferedInputStream or BufferedReader.

Below written code will read String from .csv file, the file name will be provided as a argument in main method..

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.IOUtils;

public class ReadingCSVFileDemo {


    public static void main(String[] arg)throws IOException

    {
        List<String> existFileContent=new ArrayList<String>();
            String newvalue=null;
            FileReader reader = new FileReader(new File(arg[0]));

            List<String> lines = IOUtils.readLines(reader);
                try{
                for (String value : lines) {

                    if(value!=null){
                    //newvalue=value.split(",");
                    existFileContent.add(value);
                    }
                        }System.out.println("size of List"+ existFileContent.size());
                        System.out.println("element in a list"+ existFileContent);

        // below finally block we are closing a stream ignoring nulls and exceptions                
        }finally{IOUtils.closeQuietly(reader);}
        }
    }