文件E.java的长度是51个字节，请说出E类中标志的【代码

import java.io.*;
public class E{
    public static void main(String args[]){
        File f=new File("E.java");
        try{
            RandomAccessFile in = new RandomAccessFile(f,"rw");
            System.out.println(f.length());  // 【代码1】
            FileOutputStream out = new FileOutputStream(f);
            System.out.println(f.length());  // 【代码2】
        }catch(IOException e){
                    System.out.println("File read Error"+e);
            }
    }
}