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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