java读取文件大小和内容

import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;public class first {    public static void main(String[] args) throws IOException {        File f = new File("C:\\Users\\lxw\\OneDrive\\python\\bird.txt");//新建一个File对象        System.out.println("文件大小:"+f.length()+"Bytes");        BufferedReader br = new BufferedReader(new FileReader(f));        String line=null;        while((line=br.readLine())!=null) {//一行一行读取文件            System.out.print(line);        }        System.out.print("读取文件结束\n");    }}