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target="_blank" href="http://java.sun.com/javase/6/download.jsp">Download the JDK</a> <br> <a href="../../search.html" target="_blank">Search the Tutorials</a> <br> <a href="javascript:toggleLeft()" id="ToggleLeft">Hide the TOC</a> </div> </div> </div> </div> </div> </div> <div class=PrintHeaders> <b>Trail:</b> Creating a GUI with JFC/Swing <br><b>Lesson:</b> Using Swing Components <br><b>Section:</b> How to Use Various Components </div> <div id=LeftBar class=LeftBar_shown> <div id=Contents> <div class="linkLESSON"><a href="index.html">Using Swing Components</a></div><div class="linkAHEAD"><a href="components.html">A Visual Index to the Swing Components</a></div><div class="linkAHEAD"><a href="html.html">Using HTML in Swing Components</a></div><div class="linkAHEAD"><a href="toplevel.html">Using Top-Level Containers</a></div><div class="linkAHEAD"><a href="model.html">Using Models</a></div><div class="linkAHEAD"><a href="jcomponent.html">The JComponent Class</a></div><div 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Text Fields</a></div><div class="linkBHEAD"><a href="frame.html">How to Make Frames (Main Windows)</a></div><div class="linkBHEAD"><a href="internalframe.html">How to Use Internal Frames</a></div><div class="nolinkBHEAD">How to Use Labels</div><div class="linkBHEAD"><a href="layeredpane.html">How to Use Layered Panes</a></div><div class="linkBHEAD"><a href="list.html">How to Use Lists</a></div><div class="linkBHEAD"><a href="menu.html">How to Use Menus</a></div><div class="linkBHEAD"><a href="panel.html">How to Use Panels</a></div><div class="linkBHEAD"><a href="passwordfield.html">How to Use Password Fields</a></div><div class="linkBHEAD"><a href="progress.html">How to Use Progress Bars</a></div><div class="linkBHEAD"><a href="rootpane.html">How to Use Root Panes</a></div><div class="linkBHEAD"><a href="scrollpane.html">How to Use Scroll Panes</a></div><div class="linkBHEAD"><a href="separator.html">How to Use Separators</a></div><div class="linkBHEAD"><a href="slider.html">How to Use Sliders</a></div><div class="linkBHEAD"><a href="spinner.html">How to Use Spinners</a></div><div class="linkBHEAD"><a href="splitpane.html">How to Use Split Panes</a></div><div class="linkBHEAD"><a href="tabbedpane.html">How to Use Tabbed Panes</a></div><div class="linkBHEAD"><a href="table.html">How to Use Tables</a></div><div class="linkBHEAD"><a href="textarea.html">How to Use Text Areas</a></div><div class="linkBHEAD"><a href="textfield.html">How to Use Text Fields</a></div><div class="linkBHEAD"><a href="toolbar.html">How to Use Tool Bars</a></div><div class="linkBHEAD"><a href="tooltip.html">How to Use Tool Tips</a></div><div class="linkBHEAD"><a href="tree.html">How to Use Trees</a></div><div class="linkAHEAD"><a href="icon.html">How to Use Icons</a></div><div class="linkAHEAD"><a href="border.html">How to Use Borders</a></div><div class="linkAHEAD"><a href="problems.html">Solving Common Component Problems</a></div></div> </div> <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=internalframe.html>« Previous</a> • <a target=_top href=../TOC.html>Trail</a> • <a target=_top href=layeredpane.html>Next »</a> </div> <div id=PageTitle>How to Use Labels</div> <blockquote>With the<a class="APILink" target="_blank" href="http://java.sun.com/javase/6/docs/api/javax/swing/JLabel.html"><code>JLabel</code></a> class,you can display unselectable text and images.If you need to create a componentthat displays a string or an image (or both),you can do so by using or extending <code>JLabel</code>.If the component is interactive and has state,consider using a<a href="button.html">button</a>instead of a label.<p>By specifying HTML codes in a label's text,you can make the label have multiple lines, multiple fonts,multiple colors, and so on.If the label uses just a single color or font,you can avoid the overhead of HTML processing by usingthe <code>setForeground</code> or <code>setFont</code> method instead.See<a href="html.html">Using HTML in Swing Components</a>for details.<p>Here's a picture of an applicationthat displays three labels.The window is divided into three rows of equal height;the label in each row is as wide as possible.<p><center><IMG SRC="../../figures/uiswing/components/LabelDemoMetal.png" WIDTH="181" HEIGHT="160" ALIGN="BOTTOM" ALT="A snapshot of LabelDemo, which uses labels with text and icons."></center></p><blockquote><hr><strong>Try this:</strong> <ol><li> <a href="http://java.sun.com/docs/books/tutorialJWS/uiswing/components/examples/LabelDemo.jnlp">Run LabelDemo</a> (it requires release 6) using<a class="TutorialLink" target="_top" href="../../information/javawebstart.html">Java<sup><font size=-2>TM</font></sup> Web Start</a>. Or, to compile and run the example yourself, consult the <a href="examples/index.html#LabelDemo">example index</a>.<li> Resize the window so you can see how the labels' contents are placed within the labels' drawing area. <br> All the label contents have the default vertical alignment — the label contents are centered vertically in the label's drawing area. The top label, which contains both image and text, is specified to have horizontal center alignment. The second label, which contains just text, has the left (leading) alignment that is the default for text-only labels in left-to-right languages. The third label, which contains just an image, has horizontal center alignment, which is the default for image-only labels.</ol><hr></blockquote><p>Below is the code from<a class="SourceLink" target="_blank" href="examples/LabelDemo.java"><code>LabelDemo.java</code></a>that creates the labels in the previous example.<blockquote><pre>ImageIcon icon = createImageIcon("images/middle.gif");. . .label1 = new JLabel("Image and Text", icon, JLabel.CENTER);//Set the position of the text, relative to the icon:label1.setVerticalTextPosition(JLabel.BOTTOM);label1.setHorizontalTextPosition(JLabel.CENTER);label2 = new JLabel("Text-Only Label");⌨️ 快捷键说明
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