ارور در اجرای ایجاد پنجره

[saeed51100]

سلام
مثال صفحه 395 آقای جعفر نژاد قمی را عینا با نت بینز اجرا کرده و ارور می دهد . اشکال از کجاست ؟

//پنجره و استفاده از Jbutton و Jlabel





package test113;

import javax.swing.JFrame;





public class Test113 {





   private static final int WIDTH=350;

   private static final int HEIGHT=350;

  

   public static void main (String[] args){

       LabelsColorsFonts demoObject=new LabelsColorsFonts();

       demoObject.setSize(WIDTH , HEIGHT);

       demoObject.setVisible(true);

       demoObject.setDefaultCloseOperation(JFrame.EXIT_ON  _CLOSE);

      

    }

    

}

//فایل جدیدLabelsColorsFonts





import javax.swing.*;

import java.awt.*;

import java.awt.event.*;







public class LabelsColorsFonts extends JFrame{

    private JLabel javaL , programmingL ;

    private JButton colorB , fontB ;

    private ColorButtonHandler cHandler ;

    private FontButtonHandler fHandler ;

    private Container pane ;

    

    public LabelsColorsFonts(){

        //Create two labels

            javaL=new JLabel("Java",SwingConstants.CENTER);

            programmingL=new JLabel("Programming",SwingConstants.CENTER);

        

        //Create color button

            colorB=new JButton("Color");

            cHandler=new ColorButtonHandler();

            colorB.addActionListener(cHandler);

        

        //Create font button

            fontB=new JButton("Font");

            fHandler=new FontButtonHandler();

            fontB.addActionListener(fHandler);

        

        //Set the title of the window

            setTitle("Labels , fonts , and colors demonstration");

        

        //Get the container

            pane=getContentPane();

        

        //Set the layout

            pane.setLayout(new GridLayout(2,2));

            

        //Place the components in the pane

            pane.add(javaL);

            pane.add(programmingL);

            pane.add(colorB);

            pane.add(fontB);

                               

    }

    //**************************************************  *

    

    private class ColorButtonHandler implements ActionListener{

    @Override

    public void actionPerformed(ActionEvent e){  

    javaL.setForeground(Color.red);

    programmingL.setForeground(Color.blue);

    

    pane.setBackground(Color.cyan);

    

    colorB.setBackground(Color.orange);

    fontB.setBackground(Color.orange);

      }

  

    }//end of class class ColorButtonHandler

//**************************************************  *******

    private class FontButtonHandler implements ActionListener{

 @Override

 public void actionPerformed(ActionEvent e){

     javaL.setFont(new Font("Arial",Font.BOLD,24));

     programmingL.setFont(new Font("Arial",Font.BOLD,24));

    

 }

}//End of class FontHandler

}//End of class LabelsColorsFonts