java批量修改文件名字

package com.test;import java.io.File;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class RenameFiles { public final String RDR ="[RDR]";public final String ACD ="[ACD]";    public void ChangeFileName(File file){ String dirPath = file.getAbsolutePath();//目录路径 Calendar calendar = Calendar.getInstance();     Date date = calendar.getTime();     SimpleDateFormat df=new SimpleDateFormat("MMdd");     String style = df.format(date); if(file.isDirectory()){   File[] files =file.listFiles();   for(File f: files){   String originalName = f.getName();   String toFileName = dirPath+"\\"+style + RDR +originalName;   File finalName = new File(toFileName);   f.renameTo(finalName);   }   }     }public static void main(String[] args) {         File file = new File("E:\\1");        new RenameFiles().ChangeFileName(file);         } }