java - JPanel size not being set -

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i'm working on irc bot , today create gui it.

i'm trying create column layout has 2 parts, left , right. left side show console output, right contain controls (joining channels, commands etc).

i'm having issues creating 2 columns. have jpanel whole width , height of window , has border of 10 pixels, , have 2 panels within that; left , right.

the left , right panels reason taking whole size of window, , right panel overlapping everything.

here's example picture: http://i.imgur.com/lc4vhvh.png white right panel, should half size , have identical black panel on left of it.

here's current code, sorry if it's messy, new whole swing gui.. help.

package tk.taylerking.gribbybot;  import java.awt.color; import java.awt.dimension; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.keyevent; import java.util.arraylist; import java.util.hashmap;  import javax.swing.borderfactory; import javax.swing.swingutilities; import javax.swing.uimanager;  import com.alee.laf.weblookandfeel; import com.alee.laf.menu.webmenubar; import com.alee.laf.menu.webmenuitem; import com.alee.laf.panel.webpanel; import com.alee.laf.rootpane.webframe;  public class gribbybot extends webframe {     private static final long serialversionuid = 4641597667372956773l;     public static hashmap<string, arraylist<string>> connections = new hashmap<string, arraylist<string>>();     public static void main(string[] args) throws exception {         uimanager.setlookandfeel(weblookandfeel.class.getcanonicalname());         swingutilities.invokelater(new runnable(){             public void run(){                 gribbybot gb = new gribbybot();                 gb.setvisible(true);             }         });     }     public gribbybot(){         webpanel panel = new webpanel();         panel.setborder(borderfactory.createemptyborder(10, 10, 10, 10));         panel.setpreferredsize(new dimension(780, 580));          webmenubar menu = new webmenubar();         webmenuitem file = new webmenuitem("exit");         file.setmnemonic(keyevent.vk_e);         file.addactionlistener(new actionlistener(){             public void actionperformed(actionevent e) {                 system.exit(0);                          }         });         menu.add(file);         setjmenubar(menu);          webpanel left = new webpanel();         left.setpreferredsize(new dimension(380, 580));         left.setbackground(color.black);          webpanel right = new webpanel();         right.setpreferredsize(new dimension(380, 580));         right.setbackground(color.white);          add(panel);         panel.add(left);         panel.add(right);         settitle("gribbybot");         setsize(800, 600);         setlocationrelativeto(null);         setdefaultcloseoperation(exit_on_close);         setresizable(false);     } }

on side note, variables prefixed "web" same swing, it's custom gui.

override jcomponent#getpreferredsize() instead of using setpreferredsize()

read more should avoid use of set(preferred|maximum|minimum)size methods in java swing?

if extremely needed in case of performing custom painting try in way:

sample code:

final jpanel panel = new jpanel(){     @override     public void paintcomponent(graphics g){         super.paintcomponent(g);         // custom painting code here     }      @override     public dimension getpreferredsize() {         return new dimension(40, 40);     } };

why using setpreferredsize() method whereas can achieve design using proper layout such boxlayout, gridlayout, borderlayout etc.

read more layout how use various layout managers

edit

try jpanel panel = new jpanel(new gridlayout(1,2));


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