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getContentPane().add(panel,BorderLayout.CENTER); in Java

duncanb7
duncanb7 asked
on
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Last Modified: 2013-11-23
:Dear Expert,
I hav ran javac command  many times on the following code, there is still last error left.
The error is at last line in attahced code about not finding the symbol  of
getContentPane().add(panel,BorderLayout.CENTER); I already include
everything of java at the begining line of the code but still get the following
error.
Please help on this, and I suspect I use wrongly code about "public static void main(String[] args) { " at the last serveral lines in the code That may be bad  code when  I am using Applet to display the chart output result in  IE with HTML code  

Why Javac could not find out the symbol  of getCOntentPane() ? That is
supposed not too difficult ..Right ? Or Is the error related to JPanel();

And other question , html code I write at last line of this email is problem  
regardless of my code of  Java code of "simplearea.java"

Please kindly advise and help on it
Duncan




==============================================
javac Error:

D:\wkw\Summary\INTERN~1\CHART-~1\javademo>javac -classpath "ChartDirector_s.jar;." simplearea.java
simplearea.java:95: cannot find symbol
symbol  : method getContentPane()
location: class simplearea
       getContentPane().add(panel,BorderLayout.CENTER);
       ^
1 error
==========
I want use HTML code with Applet to display chart output result in IE as follows:

<HTML>
  <HEAD>
    <TITLE>A Simplearea (1.6)</TITLE>
  </HEAD>
  <BODY>
    <h1>A Simplearea (1.6)</h1>
    <hr>
    <applet code="simplearea.class" archive="ChartDirector_s.jar" width=170 height=150>
      alt="Your browser understands the &lt;APPLET&gt; tag but isn't running the applet, for some reason."
      Your browser is completely ignoring the &lt;APPLET&gt; tag!
</applet>
 
  </BODY>
</HTML>
==================================


/* Demo example of "simplearea.java" */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;
import java.applet.*;

import java.io.*;

import java.util.*;


import javax.swing.event.*;

import javax.swing.border.*;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;


public class simplearea extends Applet implements DemoModule
{
    //Name of demo program
    public String toString() { return "Simple Area Chart"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int index)
    {
        // The data for the area chart
        double[] data = {30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60,
            55, 53, 35, 50, 66, 56, 48, 52, 65, 62};

        // The labels for the area chart
        String[] labels = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
            "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22",
            "23", "24"};

        // Create a XYChart object of size 250 x 250 pixels
        XYChart c = new XYChart(250, 250);

        // Set the plotarea at (30, 20) and of size 200 x 200 pixels
        c.setPlotArea(30, 20, 200, 200);

        // Add an area chart layer using the given data
        c.addAreaLayer(data);

        // Set the labels on the x axis.
        c.xAxis().setLabels(labels);

        // Display 1 out of 3 labels on the x-axis.
        c.xAxis().setLabelStep(3);

        // Output the chart
        viewer.setImage(c.makeImage());

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='Hour {xLabel}: Traffic {value} GBytes'"));
    }

    //Allow this module to run as standalone program for easy testing
    public static void main(String[] args)
    {
        //Instantiate an instance of this demo module
        DemoModule demo = new simplearea();

        //Create and set up the main window
        JPanel panel = new JPanel();
       /* frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);} });
        frame.getContentPane().setBackground(Color.white);*/

        // Create the chart and put them in the content pane
        ChartViewer viewer = new ChartViewer();  
        demo.createChart(viewer, 0);
        panel.add(viewer);
       /* frame.getContentPane().add(viewer);*/

        // Display the window
       /* frame.pack();
        frame.setVisible(true);*/
       getContentPane().add(panel,BorderLayout.CENTER);


    }
}

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