?? sorter.htm
字號:
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<TITLE>Sorting the Rows in a JTable Component Based on a Column (Java Developers Almanac Example)
</TITLE>
<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
<META CONTENT="Addison-Wesley/Patrick Chan" NAME="OWNER">
<META CONTENT="3/20/02" NAME="revision">
<META CONTENT="no-cache" HTTP-EQUIV="Pragma">
<LINK href="/almanac.css" media="screen" type="text/css" rel="stylesheet">
</HEAD>
<BODY>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD></TD>
</TR>
</TABLE>
<br>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD></TD>
</TR>
<TR>
<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top">
<h1>The Java Developers Almanac 1.4</h1>
<br>
Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
</TD>
</TR>
<TR>
<TD align="right" valign="bottom">
<FORM method="get" action="/cgi-bin/search/find.pl">
<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
</FORM>
</TD>
</TR>
</TABLE>
<HR color="#6666cc">
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD valign="top"><script type="text/javascript">
<!--
google_ad_client = "pub-6001183370374757";
google_ad_width = 120;
google_ad_height = 600;
google_ad_format = "120x600_as";
google_ad_channel = "4777242811";
google_ad_type = "text_image";
google_color_border = "FFFFFF";
google_color_bg = "FFFFFF";
google_color_link = "6666CC";
google_color_url = "6666CC";
google_color_text = "000000";
//--></script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"></script></TD><TD> </TD><TD valign="top">
<DIV ALIGN="LEFT">
<A HREF="/">Home</A>
>
<A HREF="../index.html">List of Packages</A>
>
<A HREF="../javax.swing.table/pkg.html">javax.swing.table</A><font color="#666666" class="xsmall-font">
[62 examples]
</font>
>
<B><A HREF="../javax.swing.table/pkg.html#Sorting">Sorting</A></B><font color="#666666" class="xsmall-font">
[2 examples]
</font>
</DIV><P>
<h3>e961. Sorting the Rows in a JTable Component Based on a Column</h3>
This example implements a method that sorts all the rows in a
<code>DefaultTableModel</code> based on the values of the column.
<pre> DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
// Add data here...
// Disable autoCreateColumnsFromModel otherwise all the column customizations
// and adjustments will be lost when the model data is sorted
table.setAutoCreateColumnsFromModel(false);
// Sort all the rows in descending order based on the
// values in the second column of the model
sortAllRowsBy(model, <font color="#0066ff"><i>1</i></font>, <font color="#0066ff"><i>false</i></font>);
// Regardless of sort order (ascending or descending), null values always appear last.
// colIndex specifies a column in model.
public void sortAllRowsBy(DefaultTableModel model, int colIndex, boolean ascending) {
Vector data = model.getDataVector();
Collections.sort(data, new ColumnSorter(colIndex, ascending));
model.fireTableStructureChanged();
}
// This comparator is used to sort vectors of data
public class ColumnSorter implements Comparator {
int colIndex;
boolean ascending;
ColumnSorter(int colIndex, boolean ascending) {
this.colIndex = colIndex;
this.ascending = ascending;
}
public int compare(Object a, Object b) {
Vector v1 = (Vector)a;
Vector v2 = (Vector)b;
Object o1 = v1.get(colIndex);
Object o2 = v2.get(colIndex);
// Treat empty strains like nulls
if (o1 instanceof String && ((String)o1).length() == 0) {
o1 = null;
}
if (o2 instanceof String && ((String)o2).length() == 0) {
o2 = null;
}
// Sort nulls so they appear last, regardless
// of sort order
if (o1 == null && o2 == null) {
return 0;
} else if (o1 == null) {
return 1;
} else if (o2 == null) {
return -1;
} else if (o1 instanceof Comparable) {
if (ascending) {
return ((Comparable)o1).compareTo(o2);
} else {
return ((Comparable)o2).compareTo(o1);
}
} else {
if (ascending) {
return o1.toString().compareTo(o2.toString());
} else {
return o2.toString().compareTo(o1.toString());
}
}
}
}
</pre>
<P><table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td bgcolor="#6666cc" align="center"><font color="#ffffff">
<b>Related Examples</b></font></td>
</tr>
</table>
e962. <a class="eglink" href="SortCol.html?l=rel">
Sorting a Column in a JTable Component
</a>
<br>
<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
<tr>
<td align="left">
<br>
See also:
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Cells">
Cells
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Column%20Heads">
Column Heads
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Columns">
Columns
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Editing">
Editing
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Rows">
Rows
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Scrolling">
Scrolling
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Selection">
Selection
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Table%20Model">
Table Model
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Tool%20Tips">
Tool Tips
</a>
</td>
</tr>
</table>
<br>
<br>
<FONT class="xsmall-font">
© 2002 Addison-Wesley.
</FONT></TD><TD> </TD><TD valign="top"><A href="http://compositesw.com/devzone?ref=javaalmanac"><IMG alt="Click Here" height="600" width="120" border="0" src="/csw_oad_120x600_final.gif"></A></TD>
</TR>
</TABLE>
</BODY>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<META CONTENT="NO-CACHE" HTTP-EQUIV="PRAGMA">
</HEAD>
</HTML>
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -