I have the level of code

the practice of iterator methods we commonly use

Private classListitrextendsItrImplementsListiterator<e>{Listitr (intindex) {Cursor=index; }     Public Booleanhasprevious () {returnCursor! = 0; }         PublicE Previous () {checkforcomodification (); Try {                inti = Cursor-1; E previous=get (i); Lastret= cursor =i; returnprevious; } Catch(indexoutofboundsexception e) {checkforcomodification (); Throw Newnosuchelementexception (); }        }     Public intNextindex () {returncursor; }     Public intPreviousindex () {returnCursor-1; }     Public voidset (e e) {if(Lastret = =-1)        Throw Newillegalstateexception ();        Checkforcomodification (); Try{abstractlist. This. Set (Lastret, E); Expectedmodcount=Modcount; } Catch(Indexoutofboundsexception ex) {Throw Newconcurrentmodificationexception (); }    }     Public voidAdd (e e) {checkforcomodification (); Try{abstractlist. This. Add (cursor++, E); Lastret=-1; Expectedmodcount=Modcount; } Catch(Indexoutofboundsexception ex) {Throw Newconcurrentmodificationexception (); }    }    }

the Resize method and Putall method in HashMap

 void  resize (int   Newcapacity) {entry[] oldtable  = table;         int  oldcapacity = Oldtable.length;             if  (oldcapacity == maximum_capacity) {            Threshold  = Integer.max_value;         return  ; } entry[] newtable  = new   entry[newcapacit        Y];        Transfer (newtable);        Table  = newtable; Threshold  = (int ) (newcapacity *

   Public voidPutall (map<?extendsK?extendsV>m) {intnumkeystobeadded =m.size (); if(numkeystobeadded = = 0)            return; if(Numkeystobeadded >threshold) {            intTargetcapacity = (int) (Numkeystobeadded/loadfactor + 1); if(Targetcapacity >maximum_capacity) targetcapacity=maximum_capacity; intNewcapacity =table.length;  while(Newcapacity <targetcapacity) newcapacity<<= 1; if(Newcapacity >table.length) Resize (newcapacity); }         for(ITERATOR&LT;?extendsmap.entry<?extendsK?extendsv>> i =M.entryset (). iterator (); I.hasnext ();) {Map.entry<?extendsK?extendsV> e =I.next ();        Put (E.getkey (), E.getvalue ()); }    }

I write my own application log in server monitoring, inheriting the Runnable interface

  Public voidrun () {String curstopedreasonmsg; Try {            if( This. Applicationmodel.getonpreruncallback ()! =NULL) {                 This. Applicationmodel.getonpreruncallback (). CallBack ( This); }            intFirstflag = This. Applicationmodel.getfirstflag (); String Command= Cmdutil.getcommand ( This. Applicationmodel); Log.info ("EXE Command====>:" +command); File FilePath= Stringutils.isnotblank ( This. Applicationmodel.getprogrampath ())?NewFile ( This. Applicationmodel.getprogrampath () + file.separator):NULL;  This. Process = Runtime.getruntime (). EXEC (Command,NULL, FilePath); if( This. Applicationmodel.getonruncallback ()! =NULL) {                 This. Applicationmodel.getonruncallback (). CallBack ( This); } inputstream stdin= This. Process.getinputstream (); InputStream stderr= This. Process.geterrorstream (); Thread TIn=NewThread (NewAppconsole (stdin, This. Applicationmodel)); Thread Terr=NewThread (NewAppconsole (stderr, This. Applicationmodel));            Tin.start ();            Terr.start (); if( This. Applicationmodel.getonrunmonicallback ()! =NULL) {                 This. Applicationmodel.getonrunmonicallback (). CallBack ( This); }            intresult = This. Process.waitfor ();            Tin.join ();            Terr.join (); if(Result = = 0) {Log.info ("Server [" + This. Applicationmodel.getappname () + "] Stop successful!); } Else{log.info ("Server [" + This. Applicationmodel.getappname () + "] Stop failed!"); } String stoptime=Dateutil.getnow (); if(AppStatusEnum.RUNNING.equals ( This. Applicationmodel.getappstatusenum ())) {                 This. stopedmsg = (appconstants.stoped_exception_msg + "[" + StopTime + "]"); } Else {                 This. stopedmsg = ( This. applicationmodel.getstopedreasonmsg () + "[" + StopTime + "]"); }        } Catch(Exception e) {log.error ("", E);  This. stopedmsg = (appconstants.running_exception_msg + "[" + e.getmessage () + "]"); Try {                if( This. Applicationmodel.getonstopcallback ()! =NULL) {                     This. Applicationmodel.getonstopcallback (). CallBack ( This); Curstopedreasonmsg= This. applicationmodel.getstopedreasonmsg (); if( (Stringutils.isnotblank (curstopedreasonmsg))&& (Curstopedreasonmsg.indexof (appconstants.stoped_restart_msg)! =-1) {thread.sleep (3000L); Appmanager.getinstance (). STARTAPP ( This. Applicationmodel); }                }            } Catch(Exception ex) {Log.error ("", ex); Throw NewRuntimeException (ex); }        } finally {            Try {                if( This. Applicationmodel.getonstopcallback ()! =NULL) {                     This. Applicationmodel.getonstopcallback (). CallBack ( This); Curstopedreasonmsg= This. applicationmodel.getstopedreasonmsg (); if( (Stringutils.isnotblank (curstopedreasonmsg))&& (Curstopedreasonmsg.indexof (appconstants.stoped_restart_msg)! =-1) {thread.sleep (3000L); Appmanager.getinstance (). STARTAPP ( This. Applicationmodel); }                }            } Catch(Exception e) {log.error ("", E); Throw NewRuntimeException (e); }        }    }

I have the level of code