swing - Java JScrollBar Design -

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i want customize jscrollbar design. use mac develop app eclipse. tried scrollpane.getverticalscrollbar().setbackground(color.black); nothing happen.

my code: 

scrollpane = new jscrollpane(scriptview); scrollpane.setborder(borderfactory.createemptyborder()); scrollpane.getverticalscrollbar().setunitincrement(6); window.getcontentpane().add(scrollpane);

the object scriptview class jeditorpane.

how should look:

sample

thanks every help.

i guess looking transparent scrollbar.

enter image description here

this presented idea(not tested code):

import java.awt.*; import javax.swing.*; import javax.swing.border.*; import javax.swing.plaf.basic.*;  public class translucentscrollbartest {   public jcomponent makeui() {     jtextarea cmp = new jtextarea();     string str = "1234567890abcdefghijklmnopqrstuvwxyz";     for(int i=0; i<20; i++) {       cmp.append(str+str+"\n");     }     cmp.setforeground(color.white);     cmp.setbackground(color.black);     cmp.setopaque(true);      jscrollpane scrollpane = new jscrollpane(       cmp, scrollpaneconstants.vertical_scrollbar_always,       scrollpaneconstants.horizontal_scrollbar_never);     scrollpane.setcomponentzorder(scrollpane.getverticalscrollbar(), 0);     scrollpane.setcomponentzorder(scrollpane.getviewport(), 1);     scrollpane.getverticalscrollbar().setopaque(false);      scrollpane.setlayout(new scrollpanelayout() {       @override       public void layoutcontainer(container parent) {         jscrollpane scrollpane = (jscrollpane)parent;          rectangle availr = scrollpane.getbounds();         availr.x = availr.y = 0;          insets insets = parent.getinsets();         availr.x = insets.left;         availr.y = insets.top;         availr.width  -= insets.left + insets.right;         availr.height -= insets.top  + insets.bottom;          rectangle vsbr = new rectangle();         vsbr.width  = 12;         vsbr.height = availr.height;         vsbr.x = availr.x + availr.width - vsbr.width;         vsbr.y = availr.y;          if(viewport != null) {           viewport.setbounds(availr);         }         if(vsb != null) {           vsb.setvisible(true);           vsb.setbounds(vsbr);         }       }     });     scrollpane.getverticalscrollbar().setui(new basicscrollbarui() {       private final dimension d = new dimension();       @override protected jbutton createdecreasebutton(int orientation) {         return new jbutton() {           @override public dimension getpreferredsize() {             return d;           }         };       }       @override protected jbutton createincreasebutton(int orientation) {         return new jbutton() {           @override public dimension getpreferredsize() {             return d;           }         };       }       @override       protected void painttrack(graphics g, jcomponent c, rectangle r) {}       @override       protected void paintthumb(graphics g, jcomponent c, rectangle r) {         graphics2d g2 = (graphics2d)g.create();         g2.setrenderinghint(renderinghints.key_antialiasing,                             renderinghints.value_antialias_on);         color color = null;         jscrollbar sb = (jscrollbar)c;         if(!sb.isenabled() || r.width>r.height) {           return;         }else if(isdragging) {           color = new color(200,200,100,200);         }else if(isthumbrollover()) {           color = new color(255,255,100,200);         }else {           color = new color(220,220,200,200);         }         g2.setpaint(color);         g2.fillroundrect(r.x,r.y,r.width,r.height,10,10);         g2.setpaint(color.white);         g2.drawroundrect(r.x,r.y,r.width,r.height,10,10);         g2.dispose();       }       @override       protected void setthumbbounds(int x, int y, int width, int height) {         super.setthumbbounds(x, y, width, height);         scrollbar.repaint();       }     });     return scrollpane;   }   public static void main(string[] args) {     eventqueue.invokelater(new runnable() {       @override public void run() {         createandshowgui();       }     });   }   public static void createandshowgui() {     jframe f = new jframe();     f.setdefaultcloseoperation(windowconstants.exit_on_close);     f.getcontentpane().add(new translucentscrollbartest().makeui());     f.setsize(320, 240);     f.setlocationrelativeto(null);     f.setvisible(true);   } }

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