java - Where is the actionperfomed() method called? -

-

i'm java beginner , come down work interfaces, want know happens. suppose example actionlistener interface.

all know interfaces is, forces implement methods given interface. don't get, actionperformed(actionevent e) method called. , there simple examples show me happens in background? anyway.

in case of jbutton, superclass abstractbutton calls actionperformed method through method fireactionperformed protected method. if check source code you'll see constructs actionevent object , calls actionperformed using argument.


Comments

Post a Comment

Popular posts from this blog

python - Overwriting the save method of a Django model -

-
i have table of symbols. before add new symbol validate symbol. for purpose have overwritten save method in model: def save(self, *args, **kwargs): if self.check_exist(self.name): # call "real" save() method. super(assetssymbol, self).save(*args, **kwargs) else: # yes, symbol not saved in database # that's good. using 1 or 2 lines of code in else how can inform user has submitted invalid symbol? django still reports symbol "test" has been saved (which misleading) i try avoid using modelforms etc. here's more current implementation: @admin.register(assetssymbol) class assetsymboladmin(admin.modeladmin): list_display = ("name", "group", "alive", "internal") list_filter = ("name", "group", "alive", "internal") ... def save_model(self, request, obj, form, change): if self.check_exist(obj.name): ...
Read more

java - how to browse all messages from 2 different MQQueue in the same function? -

-
my purpose list down correlation ids of messages in set of mq queues in java application. this code snippet public void populatecorrelationids() throws mqexception{ int openoptions = mqconstants.mqoo_input_as_q_def | mqconstants.mqoo_output | mqconstants.mqoo_inquire | mqconstants.mqoo_browse; string qnames[0] = bay10.cischgx.dfda; string qnames[1] = baysf11.msfchgx.dfda; mqmessage messageget = new mqmessage(); for(string q : qnames){ mqqueue dfdaq = qmgr.accessqueue(q, openoptions); mqgetmessageoptions gmo = new mqgetmessageoptions(); gmo.options = mqconstants.mqgmo_browse_first| mqconstants.mqgmo_wait; gmo.waitinterval = 4000; int j = dfdaq.getcurrentdepth(); for(int i=0;i<j;i++) { dfdaq.get(messageget,gmo); //error generated here when getting message qnames[1] byte[] correlid= messageget.correlationid; } } } below error getting -- mqje001: completion code ...
Read more

java - From File[] files to directory -

-
i have problem code: public class files { public static void main(string[] args) throws ioexception { // filter files aaa.txt , bbb.txt another's file f = new file("d:\\dir"); // current directory file f1 = new file("d:\\dir1\\"); filenamefilter textfilter = new filenamefilter() { public boolean accept(file dir, string name) { if (name.startswith("a") && name.endswith(".txt")) { //system.out.println(name); return true; } else if (name.startswith("b") && name.endswith(".txt")) { //system.out.println(name); return true; } else { //system.out.println(name); return false; } } }; file[] files = f.listfiles(textfilt...
Read more