java - how to change setIndeterminate jProgressbar in other frame -

i have 2 frame, framea , frameb, in framea add 1 button name buttona show frameb , progressbar (setindeterminate(false)), in frameb add 1 button name buttonb , want when click buttonb, progressbar in framea.setindeterminate(true)

in framea

frameb b;  public framea() {    initcomponents();    progressbar.setindeterminate(false);    b = new frameb(); }  public jprogressbar getprogressbar() {    return progressbar; }  private void buttonaactionperformed(java.awt.event.actionevent evt)  {                                            b.setvisible(true); } 

in frameb use code in event buttonb clicked

private void buttonbactionperformed(java.awt.event.actionevent evt) {      framea a= new framea();     a.getprogressbar().setindeterminate(true); } 

but doesnt worked

this...

private void buttonbactionperformed(java.awt.event.actionevent evt) {      framea a= new framea();     a.getprogressbar().setindeterminate(true); } 

isn't going work, you've created instance of framea that's not visible. has no relationship frame open.

there number of ways achieve this...

you could...

pass reference of framea frameb part of constructor call frameb. in actionperformed method, use reference change progress bar state.

but create tight coupling between framea , frameb reduce re-use of frameb

you could...

provide means interested party attach actionlistener frameb triggered when button clicked.

this assumes work flow , exposes components outside sources (via actionevent#getsource), allow people change component...

you should...

fire propertychanged event.

this easiest , safest of options i've come with. using property change listener in manner means don't need expose jprogressbar, jbutton or produce tight link between 2 frames.

property change support built in container components/controls have it.

for example, attach propertychangelistener b when construct it.

b = new frameb(); b.addpropertychangelistener(new propertychangelistener() {     @override     public void propertychange(propertychangeevent evt) {         if (evt.getpropertyname().equals("progressstate")) {             progressbar.setindeterminate((boolean)evt.getnewvalue());         }     } }); 

add in bframe's actionperformed method, simple call...

firepropertychange("progressstate", false, true); 

when want set indeterminate state (you swap boolean values reset if wanted to)