barchartdemo.java

使用MVC 的模型画 BAR CHART, 便于理解MVC的内涵.

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.BorderFactory;
import java.util.List;
import java.util.ArrayList;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.Dimension;

/**
 * Write a description of class BarChartDemo here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class BarChartDemo extends JPanel implements ActionListener
{
    
private
    JButton sortXButton = null;
    JButton sortYButton = null;
    BarChart    barChart = null;
    List<XYData>
        XYDatas = null;
        
    /**
     * Constructor for objects of class BarChartDemo
     */
    public BarChartDemo()
    {
        createXYDatas();
        createGUI();
       
    }
   
        
    private void createGUI()
    {
        barChart = new BarChart();
        barChart.setTitle("Grade Bar Chart");
        barChart.setRange(0,10);
        barChart.updateXYDatas(XYDatas);
        JPanel
            buttonPanel = new JPanel();
        buttonPanel.setBorder(BorderFactory.createLineBorder(Color.blue,2));  
        sortXButton = new JButton("sort by name");
        sortYButton = new JButton("sort by score");
        buttonPanel.add(sortXButton);
        buttonPanel.add(sortYButton);
        
        this.setLayout(new BorderLayout());
        this.add(barChart,BorderLayout.CENTER);
        this.add(buttonPanel,BorderLayout.SOUTH);
        
        sortXButton.addActionListener(this);
        sortYButton.addActionListener(this);
    }
    
    public void createXYDatas()
    {        
        // create XYData
        XYDatas = new ArrayList<XYData>();
        XYDatas.add(new XYData("Tim", new Float(6.23)));
        XYDatas.add(new XYData("Bob", new Float(4.25)));
        XYDatas.add(new XYData("Jason", new Float(7.32)));
        XYDatas.add(new XYData("John", new Float(7)));
        XYDatas.add(new XYData("Kate", new Float(5.21)));
        XYDatas.add(new XYData("Wilson", new Float(5.73)));
        XYDatas.add(new XYData("Kim", new Float(6.14)));
        
    }
    
    public void actionPerformed(ActionEvent e)
    {
        if( e.getSource() == sortXButton )
        {
            barChart.sortByX();
        }
        else if( e.getSource() == sortYButton)
        {
            barChart.sortByY();
        }
        
    }//End actionPerformed
    
    public static void main(String[] args)
    {
        
        JFrame
            frame =new JFrame("Bar Chart Demo");
        frame.getContentPane().add(new BarChartDemo());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       frame.setSize(new Dimension(600,400));
        frame.setVisible(true);
    
    }// End main
    
}