Java系统自带类库

/* * @(#)JTable.java 1.289 07/08/07 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.swing; import java.util.*; import java.applet.Applet; import java.awt.*; import java.awt.event.*; import java.awt.print.*; import java.beans.*; import java.io.Serializable; import java.io.ObjectOutputStream; import java.io.ObjectInputStream; import java.io.IOException; import javax.accessibility.*; import javax.swing.event.*; import javax.swing.plaf.*; import javax.swing.table.*; import javax.swing.border.*; import java.text.NumberFormat; import java.text.DateFormat; import java.text.MessageFormat; import javax.print.attribute.*; import javax.print.PrintService; import sun.swing.SwingUtilities2; import sun.swing.SwingUtilities2.Section; import static sun.swing.SwingUtilities2.Section.*; import sun.swing.PrintingStatus; /** * The <code>JTable</code> is used to display and edit regular two-dimensional tables * of cells. * See <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/table.html">How to Use Tables</a> * in <em>The Java Tutorial</em> * for task-oriented documentation and examples of using <code>JTable</code>. * * <p> * The <code>JTable</code> has many * facilities that make it possible to customize its rendering and editing * but provides defaults for these features so that simple tables can be * set up easily. For example, to set up a table with 10 rows and 10 * columns of numbers: * <p> * <pre> * TableModel dataModel = new AbstractTableModel() { * public int getColumnCount() { return 10; } * public int getRowCount() { return 10;} * public Object getValueAt(int row, int col) { return new Integer(row*col); } * }; * JTable table = new JTable(dataModel); * JScrollPane scrollpane = new JScrollPane(table); * </pre> * <p> * Note that if you wish to use a <code>JTable</code> in a standalone * view (outside of a <code>JScrollPane</code>) and want the header * displayed, you can get it using {@link #getTableHeader} and * display it separately. * <p> * To enable sorting and filtering of rows, use a * {@code RowSorter}. * You can set up a row sorter in either of two ways: * <ul> * <li>Directly set the {@code RowSorter}. For example: * {@code table.setRowSorter(new TableRowSorter(model))}. * <li>Set the {@code autoCreateRowSorter} * property to {@code true}, so that the {@code JTable} * creates a {@code RowSorter} for * you. For example: {@code setAutoCreateRowSorter(true)}. * </ul> * <p> * When designing applications that use the <code>JTable</code> it is worth paying * close attention to the data structures that will represent the table's data. * The <code>DefaultTableModel</code> is a model implementation that * uses a <code>Vector</code> of <code>Vector</code>s of <code>Object</code>s to * store the cell values. As well as copying the data from an * application into the <code>DefaultTableModel</code>, * it is also possible to wrap the data in the methods of the * <code>TableModel</code> interface so that the data can be passed to the * <code>JTable</code> directly, as in the example above. This often results * in more efficient applications because the model is free to choose the * internal representation that best suits the data. * A good rule of thumb for deciding whether to use the <code>AbstractTableModel</code> * or the <code>DefaultTableModel</code> is to use the <code>AbstractTableModel</code> * as the base class for creating subclasses and the <code>DefaultTableModel</code> * when subclassing is not required. * <p> * The "TableExample" directory in the demo area of the source distribution * gives a number of complete examples of <code>JTable</code> usage, * covering how the <code>JTable</code> can be used to provide an * editable view of data taken from a database and how to modify * the columns in the display to use specialized renderers and editors. * <p> * The <code>JTable</code> uses integers exclusively to refer to both the rows and the columns * of the model that it displays. The <code>JTable</code> simply takes a tabular range of cells * and uses <code>getValueAt(int, int)</code> to retrieve the * values from the model during painting. It is important to remember that * the column and row indexes returned by various <code>JTable</code> methods * are in terms of the <code>JTable</code> (the view) and are not * necessarily the same indexes used by the model. * <p> * By default, columns may be rearranged in the <code>JTable</code> so that the * view's columns appear in a different order to the columns in the model. * This does not affect the implementation of the model at all: when the * columns are reordered, the <code>JTable</code> maintains the new order of the columns * internally and converts its column indices before querying the model. * <p> * So, when writing a <code>TableModel</code>, it is not necessary to listen for column * reordering events as the model will be queried in its own coordinate * system regardless of what is happening in the view. * In the examples area there is a demonstration of a sorting algorithm making * use of exactly this technique to interpose yet another coordinate system * where the order of the rows is changed, rather than the order of the columns. * <p> * Similarly when using the sorting and filtering functionality * provided by <code>RowSorter</code> the underlying * <code>TableModel</code> does not need to know how to do sorting, * rather <code>RowSorter</code> will handle it. Coordinate * conversions will be necessary when using the row based methods of * <code>JTable</code> with the underlying <code>TableModel</code>. * All of <code>JTable</code>s row based methods are in terms of the * <code>RowSorter</code>, which is not necessarily the same as that * of the underlying <code>TableModel</code>. For example, the * selection is always in terms of <code>JTable</code> so that when * using <code>RowSorter</code> you will need to convert using * <code>convertRowIndexToView</code> or * <code>convertRowIndexToModel</code>. The following shows how to * convert coordinates from <code>JTable</code> to that of the * underlying model: * <pre> * int[] selection = table.getSelectedRows(); * for (int i = 0; i &lt; selection.length; i++) { * selection[i] = table.convertRowIndexToModel(selection[i]); * } * // selection is now in terms of the underlying TableModel * </pre> * <p> * By default if sorting is enabled <code>JTable</code> will persist the * selection and variable row heights in terms of the model on * sorting. For example if row 0, in terms of the underlying model, * is currently selected, after the sort row 0, in terms of the * underlying model will be selected. Visually the selection may * change, but in terms of the underlying model it will remain the * same. The one exception to that is if the model index is no longer * visible or was removed. For example, if row 0 in terms of model * was filtered out the selection will be empty after the sort. * <p> * J2SE 5 adds methods to <code>JTable</code> to provide convenient access to some * common printing needs. Simple new {@link #print()} methods allow for quick * and easy addition of printing support to your application. In addition, a new * {@link #getPrintable} method is available for more advanced printing needs. * <p> * As for all <code>JComponent</code> classes, you can use * {@link InputMap} and {@link ActionMap} to associate an * {@link Action} object with a {@link KeyStroke} and execute the * action under specified conditions. * <p> * <strong>Warning:</strong> Swing is not thread safe. For more * information see <a * href="package-summary.html#threading">Swing's Threading * Policy</a>. * <p> * <strong>Warning:</s