remove string in list in awt java -

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in application should remove string list when running on thread,but got exception like,

exception in thread "awt-eventqueue-0" java.lang.illegalargumentexception: item gh not found in list     @ java.awt.list.remove(unknown source)     @ org.sample.chatclient$updateclient$1.run(chatclient.java:200)     @ java.awt.event.invocationevent.dispatch(unknown source)     @ java.awt.eventqueue.dispatcheventimpl(unknown source)     @ java.awt.eventqueue.access$000(unknown source)     @ java.awt.eventqueue$3.run(unknown source)     @ java.awt.eventqueue$3.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$1.dointersectionprivilege(unknown source)     @ java.awt.eventqueue.dispatchevent(unknown source)     @ java.awt.eventdispatchthread.pumponeeventforfilters(unknown source)     @ java.awt.eventdispatchthread.pumpeventsforfilter(unknown source)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(unknown source)     @ java.awt.eventdispatchthread.pumpevents(unknown source)     @ java.awt.eventdispatchthread.pumpevents(unknown source)     @ java.awt.eventdispatchthread.run(unknown source)

code:

final map<string, string> lihashmap=list; swingutilities.invokelater(new runnable() {     @override     public void run() {         (entry<string, string> entry : lihashmap.entryset()) {             string client_name=entry.getkey();             if(!checklist.containskey(client_name)) {                 lst.add(client_name + "\n");                 checklist.put(client_name, ipaddress);             }         }         (entry<string, string> entry : checklist.entryset()) {             string client_name=entry.getkey();             if(!lihashmap.containskey(client_name)){                 lst.remove(client_name);//remove string list                 checklist.remove(client_name);         }     }

the problem here. change this:

if(!lihashmap.containskey(client_name)){                 lst.remove(client_name);//remove string list                 checklist.remove(client_name);         }

to this:

if(lihashmap.containskey(client_name)){                 lst.remove(client_name);//remove string list                 checklist.remove(client_name);         }

i assuming hash map backing store of items removed list. right? therefore, should remove key if in hash map , in list.

if not way works, need maintain list of items should removed, , have verified are, in fact, in list, , remove them. this:

if(toberemovedmap.containskey(client_name)){                 lst.remove(client_name);//remove string list                 checklist.remove(client_name);         }

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