swing - java boxlayout space after adding jpanel -


i have container jpanel in used boxlayout manager , add panels inside in added panel contains label , textfield using flowlayout manager. everytime add panel inside creates annoying big space after added panel. want reduce spacing of panels have tried using setsize , setpreferredsize method adjust it. here code: 

  jpanel global = new jpanel();   global.setlayout(new boxlayout(global, boxlayout.y_axis));   global.setpreferredsize(new dimension(500,312));   global.setsize(500,312);   global.setbounds(8, 5, 500, 312);   global.setborder(borderfactory.createlineborder(color.black));   global.setbackground(color.white);   //elements of global    jlabel label1 = new jlabel("global settings");   label1.setalignmentx(component.center_alignment);   label1.setfont(new font("tahoma", font.bold, 17));   global.add(label1);   global.add(new jseparator());     //name field   jpanel c = new jpanel();   c.setsize(100, 1);   c.setpreferredsize(new dimension(100,1));   c.setlayout(new flowlayout());   jlabel label = new jlabel("display name");   jtextfield text = new jtextfield(20);   text.setpreferredsize(new dimension(20,25));   c.add(label);   c.add(text);   global.add(c);    //hostname field   jpanel c1 = new jpanel();   c1.setsize(100, 1);   c1.setpreferredsize(new dimension(100,1));   c1.setlayout(new flowlayout());   jlabel label2 = new jlabel("host name");   jtextfield text1 = new jtextfield(20);   text1.setpreferredsize(new dimension(20,25));   c1.add(label2);   c1.add(text1);   global.add(c1);

boxlayout pretty aggressive layoutmanager , doesn't honour preferred size of components within it. instead, must set maximum size of boxlayout components prevent them being stretched. additionally, need add box via box.createverticalglue() - special component gets stretched (rather other components).

here rewritten code:

    jpanel global = new jpanel();     global.setlayout(new boxlayout(global, boxlayout.y_axis));     global.setpreferredsize(new dimension(500, 312));     global.setsize(500, 312);     global.setbounds(8, 5, 500, 312);     global.setborder(borderfactory.createlineborder(color.black));     global.setbackground(color.white);     // elements of global      jlabel label1 = new jlabel("global settings");     label1.setalignmentx(component.center_alignment);     label1.setfont(new font("tahoma", font.bold, 17));     global.add(label1);     jseparator sep = new jseparator();     sep.setmaximumsize(new dimension((int) sep.getmaximumsize().getwidth(), 50));     global.add(sep);      // name field     jpanel c = new jpanel();     c.setmaximumsize(new dimension((int) c.getmaximumsize().getwidth(), 50));     jlabel label = new jlabel("display name");     jtextfield text = new jtextfield(20);     text.setpreferredsize(new dimension(20, 25));     c.add(label);     c.add(text);     global.add(c);      // hostname field     jpanel c1 = new jpanel();     c1.setmaximumsize(new dimension((int) c1.getmaximumsize().getwidth(), 50));     jlabel label2 = new jlabel("host name");     jtextfield text1 = new jtextfield(20);     text1.setpreferredsize(new dimension(20, 25));     c1.add(label2);     c1.add(text1);     global.add(c1);     global.add(box.createverticalglue());

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