tablesorttest.java

sun公司开发的,java2核心技术,卷II:高级性能,包括一系列的高级java应用技术,如数据库德连接,高级swing,多线程,软件本地化等等,本文件中则包含该书中的所用实例,配合该书使用,使对ja

/**
 * @version 1.00 1999-07-17
 * @author Cay Horstmann
 */

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class TableSortTest
{  public static void main(String[] args)
   {  JFrame frame = new TableSortFrame();
      frame.show();
   }
}

class SortFilterModel extends AbstractTableModel
{  public SortFilterModel(TableModel m)
   {  model = m;
      rows = new Row[model.getRowCount()];
      for (int i = 0; i < rows.length; i++)
      {  rows[i] = new Row();
         rows[i].index = i;
      }
   }

   public void sort(int c)
   {  sortColumn = c;
      Arrays.sort(rows);
      fireTableDataChanged();
   }

   public void addMouseListener(final JTable table)
   {  table.getTableHeader().addMouseListener(new MouseAdapter()
         {  public void mouseClicked(MouseEvent event)
            {  // check for double click
               if (event.getClickCount() < 2) return;

               // find column of click and
               int tableColumn
                  = table.columnAtPoint(event.getPoint());

               // translate to table model index and sort
               int modelColumn
                  = table.convertColumnIndexToModel(tableColumn);
               sort(modelColumn);
            }
         });
   }

   /* compute the moved row for the three methods that access
      model elements
   */

   public Object getValueAt(int r, int c)
   {  return model.getValueAt(rows[r].index, c);
   }

   public boolean isCellEditable(int r, int c)
   {  return model.isCellEditable(rows[r].index, c);
   }

   public void setValueAt(Object aValue, int r, int c)
   {  model.setValueAt(aValue, rows[r].index, c);
   }

   /* delegate all remaining methods to the model
   */

   public int getRowCount()
   {  return model.getRowCount();
   }

   public int getColumnCount()
   {  return model.getColumnCount();
   }

   public String getColumnName(int c)
   {  return model.getColumnName(c);
   }

   public Class getColumnClass(int c)
   {  return model.getColumnClass(c);
   }

   /* this inner class holds the index of the model row
      Rows are compared by looking at the model row entries
      in the sort column
   */

   private class Row implements Comparable
   {  public int index;
      public int compareTo(Object other)
      {  Row otherRow = (Row)other;
         Object a = model.getValueAt(index, sortColumn);
         Object b = model.getValueAt(otherRow.index, sortColumn);
         if (a instanceof Comparable)
            return ((Comparable)a).compareTo(b);
         else
            return index - otherRow.index;
      }
   }

   private TableModel model;
   private int sortColumn;
   private Row[] rows;
}

class TableSortFrame extends JFrame
{  public TableSortFrame()
   {  setTitle("TableSortTest");
      setSize(300, 200);
      addWindowListener(new WindowAdapter()
         {  public void windowClosing(WindowEvent e)
            {  System.exit(0);
            }
         } );

      // set up table model and interpose sorter

      DefaultTableModel model
         = new DefaultTableModel(cells, columnNames);
      SortFilterModel sorter = new SortFilterModel(model);

      // show table

      JTable table = new JTable(sorter);
      Container contentPane = getContentPane();
      contentPane.add(new JScrollPane(table), "Center");

      // set up double click handler for column headers

      sorter.addMouseListener(table);
   }

   private Object[][] cells =
      {  { "Mercury", new Double(2440),  new Integer(0),
            Boolean.FALSE, Color.yellow
         },
         { "Venus", new Double(6052), new Integer(0),
            Boolean.FALSE, Color.yellow
         },
         { "Earth", new Double(6378), new Integer(1),
            Boolean.FALSE, Color.blue
         },
         { "Mars", new Double(3397), new Integer(2),
            Boolean.FALSE, Color.red
         },
         { "Jupiter", new Double(71492), new Integer(16),
            Boolean.TRUE, Color.orange
         },
         { "Saturn", new Double(60268), new Integer(18),
            Boolean.TRUE, Color.orange
         },
         { "Uranus", new Double(25559), new Integer(17),
            Boolean.TRUE, Color.blue
         },
         { "Neptune", new Double(24766), new Integer(8),
            Boolean.TRUE, Color.blue
         },
         { "Pluto", new Double(1137), new Integer(1),
            Boolean.FALSE, Color.black
         }
      };

   private String[] columnNames =
      {  "Planet", "Radius", "Moons", "Gaseous", "Color"
      };
}