swing - Add 3 panels to a frame in java with JSplitPane? -

trying add 3 panels created frame in java jsplitpane. have tried 2 panels, , worked great, 3 still not want.

have read making 2 jsplitpanes , put 1 in other, not work do.

my code shows there 3 panels, size wrong.. should filled out.

my code:

    frame = new jframe(); // create new frame     frame.setvisible(true); // makes visible          frame.setsize(900, 500); // sets size              frame.settitle(""); // sets title     frame.setdefaultcloseoperation(jframe.exit_on_close);     frame.setlocationrelativeto(null); // sets window on center of screen         temp_panel = new jpanel(); // creates new jpanel     water_panel = new jpanel(); // creates new jpanel     power_panel = new jpanel(); // creates new jpanel      temp_panel.setbackground(color.decode("#2ecc71")); // sets color     water_panel.setbackground(color.decode("#3498db")); // sets color     power_panel.setbackground(color.decode("#f1c40f")); // sets color      temp_label = new jlabel("this temperature");     water_label = new jlabel("this water consumption");     power_label = new jlabel("this power consumption");      // add labels on panel     temp_panel.add(temp_label);     water_panel.add(water_label);     power_panel.add(power_label);       jsplitpane splitpaneleft = new jsplitpane(jsplitpane.horizontal_split);     jsplitpane splitpaneright = new jsplitpane(jsplitpane.horizontal_split);     splitpaneleft.setleftcomponent( temp_panel );     splitpaneleft.setrightcomponent( water_panel );     splitpaneright.setleftcomponent( splitpaneleft );     splitpaneright.setrightcomponent( power_panel );      splitpaneleft.setenabled(false);     splitpaneleft.setdividersize(0);      splitpaneright.setenabled(false);     splitpaneright.setdividersize(0);      // put splitpaneright onto single panel     jpanel panelsplit = new jpanel();     panelsplit.add( splitpaneright );      frame.add(panelsplit, borderlayout.center); 

it should this, 3 panels 3 different colors instead of 2!

hope can help

if don't need change relative sizes of components during runtime, don't use jsplitpane. instead create container jpanel uses gridlayout, new gridlayout(1, 0) 1 row , variable number of columns, add 3 colored jpanels gridlayout-using jpanel, , add jframe.