java - Change content pane on button press -


i want button change contentpane in frame. admin panel , user panel in 2 different jpanel classes gets called in mainwindow class frame.

my code looks follows:

the method button calls:

public void changecontent() throws exception{     mainwindow mw = new mainwindow();     adminui admin = new adminui ();     mw.frame.getcontentpane().removeall();     mw.frame.setcontentpane(admin);     mw.frame.revalidate();     mw.frame.repaint();  }

this method being called in "public mainwindow()" method in mainwindow class (the 1 frame) show contentpane in beginning:

public void admin() throws exception {         frame = new jframe("admin panel");         frame.setresizable(false);         frame.setbounds(100, 100, 256, 457);         frame.setdefaultcloseoperation(jframe.exit_on_close);         adminui admin = new adminui();         frame.setcontentpane(admin);     }

an equal method exists userui.

i have tried called userui() method in mainwindow when press button, doesn't refresh window, , neither changeconten() method. need help. used search feature on stackoverflow no success.


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