apache commons ioは便利.2

こんな書き方もできる.

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.apache.commons.io.IOUtils;

public class FileReadSample{

    public FileReadSample(final File file) throws IOException{

        InputStream in = null;
        try{
            in = new FileInputStream(file);
            List lines = IOUtils.readLines(in);

            for( String line : lines ){
                System.out.println(line);
            }
        }finally{
            IOUtils.closeQuietly(in);
        }
    }

    public static void main(String[] args) throws IOException {
        if( args.length == 0 ){
            throw new IllegalArgumentException();
        }
        new FileReadSample(new File( args[0]));
    }

}