File data Table: file name, size, type : Table Model « Swing JFC « Java






File data Table: file name, size, type

File data Table: file name, size, type
     

/*
 * This example is from the book "Java Foundation Classes in a Nutshell".
 * Written by David Flanagan. Copyright (c) 1999 by O'Reilly & Associates.  
 * You may distribute this source code for non-commercial purposes only.
 * You may study, modify, and use this example for any purpose, as long as
 * this notice is retained.  Note that this example is provided "as is",
 * WITHOUT WARRANTY of any kind either expressed or implied.
 */

import javax.swing.*;
import javax.swing.table.*;
import java.io.File;
import java.util.Date;

public class FileTableDemo {
  public static void main(String[] args) {
    // Figure out what directory to display;
    File dir;
    if (args.length > 0) dir = new File(args[0]);
    else dir = new File(System.getProperty("user.home"));

    // Create a TableModel object to represent the contents of the directory
    FileTableModel model = new FileTableModel(dir);

    // Create a JTable and tell it to display our model
    JTable table = new JTable(model);

    // Display it all in a scrolling window and make the window appear
    JFrame frame = new JFrame("FileTableDemo");
    frame.getContentPane().add(new JScrollPane(table), "Center");
    frame.setSize(600, 400);
    frame.setVisible(true);
  }
}

/**
 * The methods in this class allow the JTable component to get
 * and display data about the files in a specified directly.
 * It represents a table with 6 columns: file name, size, modification date, 
 * plus three columns for flags: directory, readable, writable
 **/
class FileTableModel extends AbstractTableModel {
  protected File dir;
  protected String[] filenames;

  protected String[] columnNames = new String[] {
    "name", "size", "last modified", "directory?", "readable?", "writable?"
  };

  protected Class[] columnClasses = new Class[] { 
    String.class, Long.class, Date.class, 
      Boolean.class, Boolean.class, Boolean.class
  };

  // This table model works for any one given directory
  public FileTableModel(File dir) { 
    this.dir = dir; 
    this.filenames = dir.list();  // Store a list of files in the directory
  }

  // These are easy methods.
  public int getColumnCount() { return 6; }  // A constant for this model
  public int getRowCount() { return filenames.length; }  // # of files in dir

  // Information about each column.
  public String getColumnName(int col) { return columnNames[col]; }
  public Class getColumnClass(int col) { return columnClasses[col]; }

  // The method that must actually return the value of each cell.
  public Object getValueAt(int row, int col) {
    File f = new File(dir, filenames[row]);
    switch(col) {
    case 0: return filenames[row];
    case 1: return new Long(f.length());
    case 2: return new Date(f.lastModified());
    case 3: return f.isDirectory() ? Boolean.TRUE : Boolean.FALSE;
    case 4: return f.canRead() ? Boolean.TRUE : Boolean.FALSE;
    case 5: return f.canWrite() ? Boolean.TRUE : Boolean.FALSE;
    default: return null;
    }
  }
}


           
         
    
    
    
    
  








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