IO流 带行号的缓冲区

package com.yyq;
import java.io.*;
/*
 * 装饰类(带行号的装饰类)
 */
public class LineNumberReaderDemo {

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        LineNumberReader lnbr = new LineNumberReader(new FileReader("1.txt"));
        String line = null;
        //lnbr.setLineNumber(111);
        while((line = lnbr.readLine())!=null){
            System.out.println(lnbr.getLineNumber()+":"+line);
        }
    }

}