这个程序为什么出错？？？

Question

加一句
import javax.swing.event.*;

Answer 1

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;public class Second extends JFrame {
   private int pointCount = 0;
   private Point points[] = new Point[ 1000 ]; 
   private JList colorList;
    private Container container;
int currentColor ;
   private final String colorNames[] = { "Black", "Blue", "Cyan",
      "Dark Gray", "Gray", "Green", "Light Gray", "Magenta",
      "Orange", "Pink", "Red", "White", "Yellow" };
   private final Color colors[] = { Color.black, Color.blue, Color.cyan,
      Color.darkGray, Color.gray, Color.green, Color.lightGray, Color.magenta,   
      Color.orange, Color.pink, Color.red, Color.white, Color.yellow };
   public Second()
   { 
  super( "My simple Second program" );
      container = getContentPane();
      container.setLayout( new FlowLayout() );
      colorList = new JList( colorNames );
      colorList.setVisibleRowCount( 5 );
      colorList.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );
      container.add( new JScrollPane( colorList ) );
      colorList.addListSelectionListener( new CLI());        addMouseMotionListener(  new MouseMotionAdapter() 
        {  
            public void mouseDragged( MouseEvent event )
            { if ( pointCount < points.length ) 
                { points[ pointCount ] = event.getPoint();
                   ++pointCount;
                   repaint();   }    }    }
     ); 
    setSize( 300, 150 );
setVisible( true );  
   }   
   public void paint( Graphics g )
   { super.paint( g ); 
      g.setColor(colors[1]);
      for ( int i = 0; i < points.length && points[ i ] != null; i++ )
         g.fillOval( points[ i ].x, points[ i ].y, 4, 4 );
 
   }
   public static void main( String args[] )
   { 
   Second application = new Second();
   application.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
       application.addWindowListener( new WindowAdapter()
         { public void windowClosing(WindowEvent e)
            { System.exit(0);   }
          });
   }
   class CLI implements ListSelectionListener {
    public void valueChanged( ListSelectionEvent event )
           {
//currentColor=colors[colorList.getSelectedIndex()];
           }
          }
   }