java - How do I put the JMenuBar on top in mac and change the background of a JButton -

i building mac desktop application in java. want change background of jbutton , want make jmenubar in top.

to put jmenubar on top added code:

  system.setproperty("apple.laf.usescreenmenubar", "true");   system.setproperty(       "com.apple.mrj.application.apple.menu.about.name", "stack"); 

and worked!

and change backgroud color used this:

    jbutton b = new jbutton("press me!");      b.setbackground(color.blue);      b.setcontentareafilled(false);     b.setopaque(true);     b.setborderpainted(true);     try {         uimanager.setlookandfeel(uimanager                 .getcrossplatformlookandfeelclassname());     } catch (exception e) {      } 

and worked!

the problem when changed color jmenubar not in top. after little debugging know changing lookandfeel responsable.

the complete code:

import java.awt.color;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jmenu; import javax.swing.jmenubar; import javax.swing.uimanager;  public class main {     public static void main(string[] args) {             system.setproperty("apple.laf.usescreenmenubar", "true");         system.setproperty(           "com.apple.mrj.application.apple.menu.about.name", "stack");          jbutton b = new jbutton("press me!");                    b.setbackground(color.blue);             b.setcontentareafilled(false);         b.setopaque(true);         b.setborderpainted(true);         try {             uimanager.setlookandfeel(uimanager                     .getcrossplatformlookandfeelclassname());         } catch (exception e) {          }            jframe f = new jframe();                     f.add(b);                    jmenubar m = new jmenubar();                     m.add(new jmenu("item"));            f.setjmenubar(m);         f.setvisible(true);                  f.setvisible(true);     } } 

so code change color of button jmenubar not in top. if comment lines in try not change color put jmenubar on top.

any help??

thanks in advance!

i solved adding line

b.setui(new metalbuttonui()); 

and deleting try catch.

it ended looking these:

import java.awt.color;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jmenu; import javax.swing.jmenubar; import javax.swing.uimanager; import javax.swing.plaf.metal.metalbuttonui;  public class main {      public static void main(string[] args) {          system.setproperty("apple.laf.usescreenmenubar", "true");         system.setproperty("com.apple.mrj.application.apple.menu.about.name",                 "stack");         jbutton b = new jbutton("press me!");          b.setbackground(color.blue);          b.setcontentareafilled(false);         b.setopaque(true);         b.setborderpainted(true);         b.setui(new metalbuttonui());           jframe f = new jframe();          f.add(b);            f.setbounds(0, 0, 500, 500);         jmenubar m = new jmenubar();          m.add(new jmenu("item"));            f.setjmenubar(m);         f.setvisible(true);          f.setvisible(true);     } }