java - using JScrollPane with JFrame, JPanel and GridLayout -

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• java: can't apply gridlayout jscrollpane. get java.lang.classcastexception 1 answer
• scrollpane adding grid layout 3 answers

i have gridlayout (of jtextfields : 57*57) in jpanel in jframe (resolution 800*800) , result small , that's why have jscrollpane (that have 800*800 resolution , gridlayout resolution 3000*3000 example).

i've tried many things not working. can please me ?

here concerned part of code :

thanks.

gridlayout grid = new gridlayout(thumbnail.getheight(), thumbnail.getwidth(),0,0);             final_frame = new jframe();             final_frame.setpreferredsize(new dimension(800, 800));                 jpanel mypanel = new jpanel();             mypanel.setlayout(grid);             //fill grid colors , denomination             (int yy=0;yy<thumbnail.getheight();yy++){                 (int xx=0;xx<thumbnail.getwidth();xx++){                     (int kk=0;kk<colors.length;kk++){                        if (thumbnail.getrgb(xx,yy)==colors[kk].getrgb()){                           //system.out.println("color : "+colors[kk]+" libel : h"+libel[kk]);                           jtextfield tf = new jtextfield("h"+libel[kk]);                           tf.setbackground(colors[kk]);                           tf.setsize(10, 10); //do nothing ?                           mypanel.add(tf);                         }                     }                 }             }              final_frame.add(mypanel);             final_frame.pack();             final_frame.setvisible(true);             final_frame.setlocationrelativeto(null);             final_frame.setdefaultcloseoperation(jframe.dispose_on_close);