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<div id=MainFlow class=MainFlow_indented> <span id=BreadCrumbs> <a href=../../index.html target=_top>Home Page</a> > <a href=../index.html target=_top>Creating a GUI with JFC/Swing</a> > <a href=index.html target=_top>Using Swing Components</a> </span> <div class=NavBit> <a target=_top href=passwordfield.html>« Previous</a> • <a target=_top href=../TOC.html>Trail</a> • <a target=_top href=rootpane.html>Next »</a> </div> <div id=PageTitle>How to Use Progress Bars</div> <blockquote>Sometimes a task running within a programmight take a while to complete.A user-friendly program provides someindication to the userthat the task is occurring,how long the task might take, andhow much work has already been done.One way of indicating work,and perhaps the amount of progress,is to use an animated image.<p>Another way of indicating workis to set the wait cursor,using the <a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/java/awt/Cursor.html"><code>Cursor</code></a> classand the <code>Component</code>-defined<a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/java/awt/Component.html#setCursor(java.awt.Cursor)"><code>setCursor</code></a> method. For example, the following code makes the wait cursor be displayed when the cursor is over <code>container</code> (including any components it contains that have no cursor specified):<blockquote><pre>container.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));</pre></blockquote>To convey how complete a task is,you can use a progress barlike this one:<p><center><IMG SRC="../../figures/uiswing/components/progressbar.png" WIDTH="156" HEIGHT="27" ALIGN="BOTTOM" ALT="A typical progress bar"></center></p><p>Sometimes you can't immediately determinethe length of a long-running task,or the task might stay stuck at the same state of completionfor a long time. You can show work without measurable progressby putting the progress bar in<em>indeterminate mode.</em>A progress bar in indeterminate mode displays animationto indicate that work is occurring.As soon as the progress bar can display more meaningful information,you should switch it back into its default, determinate mode.In the Java look and feel,indeterminate progress barslook like this:<p><center><IMG SRC="../../figures/uiswing/components/indprogressbar.gif" WIDTH="148" HEIGHT="21" ALIGN="BOTTOM" ALT="An indeterminate progress bar"></center></p><p>Swing provides three classes to help youuse progress bars:<dl><dt><a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/JProgressBar.html"><strong><code>JProgressBar</code></strong></a><dd>A visible component to graphically display how much of a total task has completed.⌨️ 快捷键说明
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