java - How to delete the list of files batch by batch? -

i trying delete older files in directory using below code.

for(file listfile : listfiles) {                 if(listfile.lastmodified() < purgetime) //checks if lastmodified time of file lesser purge time                 {                      try{                     listfile.delete(); // delete file if lastmodified time lesser purge time                     //system.out.println("files deleted");                     logger.error(new stringbuffer(contextinfo).append("files deleted"));                      }catch(exception e){                     //system.out.println("filedeletionerror"+e.tostring());                     }                   }else{                       logger.error(new stringbuffer(contextinfo).append("files not deleted"));                      //system.out.println("files not deleted");                  }               } 

the problem facing here if directory has more 2 million records, application not able process it. there way can delete them batch?

you can delete files in parallel using multithreading each thread deleting 1 file. assuming using java-8, following code should serve guide

list<file> listfiles = (list<file>) arrays.aslist(dir.listfiles()); listfiles.parallelstream().foreach((file)->{     string filename = file.getname();     if(file.lastmodified() < purgetime){         if(!file.delete()){             system.out.println("can't delete file: "+filename);         }else{             system.out.println("deleted: "+filename);         }     } }); 

if want accomplish same using java-6 may use following approach:

file[] listfiles=dir.listfiles(); executorservice tpe = executors.newfixedthreadpool(10); for(file file:listfiles){     runnable r = new runnable() {         @override         public void run() {             string filename = file.getname();             system.out.println(filename+":"+file.lastmodified());             if(file.lastmodified() < purgetime){                 if(!file.delete()){                     system.out.println("can't delete file: "+filename);                 }else{                     system.out.println("deleted: "+filename);                 }             }                            }     };     tpe.submit(r); } tpe.shutdown();