java - My main class doesn't seem to add a object -

i'm kind of new-ish java.

i'm trying add footer jpanel swing app. i'm doing having jpanel footer in separate class.

this footerbar-class has jpanel properties in it:

public class footerbar extends jpanel {      private jpanel footerpanel = new jpanel();     private jlabel label;      public footerbar() {          // footer test         footerpanel.setpreferredsize(new dimension(640, 16));         footerpanel.setlayout(new boxlayout(footerpanel, boxlayout.x_axis));         footerpanel.setborder(new bevelborder(bevelborder.lowered));         jlabel label;          label = new jlabel("test");         label.sethorizontalalignment(swingconstants.left);         footerpanel.add(label);          label = new jlabel("test 2");         label.sethorizontalalignment(swingconstants.center);         footerpanel.add(label);      }  } 

and have in main class. (called mainframe)

public class mainframe extends jframe {      private textpanel textpanel = new textpanel();     private toolbar toolbar = new toolbar();     private formpanel formpanel = new formpanel();     private footerbar footerpanel = new footerbar();  private static string windowtitle = "win7 usb3 installer";  /**  * properties window  */ public mainframe() {     super(windowtitle);      setlayout(new borderlayout());      add(formpanel, borderlayout.west);     add(textpanel, borderlayout.center);     add(footerpanel, borderlayout.south); } 

}

if had jpanel properties inside main class, works perfectly. doesn't show jpanel 2 different classes.
though other components move bit, won't collide jpanel. guess doesn't initialize actual jpanel. why that?

your footerbar jpanel, creating jpanel , adding things has no use, use footerbar panel directly :

public class footerbar extends jpanel {      private jlabel label;      public footerbar() {          // footer test         setpreferredsize(new dimension(getwidth(), 16));         setlayout(new boxlayout(this, boxlayout.x_axis));         setborder(new bevelborder(bevelborder.lowered));         jlabel label;          label = new jlabel("test");         label.sethorizontalalignment(swingconstants.left);         add(label);          label = new jlabel("test 2");         label.sethorizontalalignment(swingconstants.center);         add(label);      }  }