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<html><head><title>JAVA编程语言</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><link rel="stylesheet" href="../../../css/text.css" type="text/css"><script language="JavaScript"><!--function MM_openBrWindow(theURL,winName,features) { //v2.0 window.open(theURL,winName,features);}//--></script></head><body bgcolor="#FFFFFF" text="#000000" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" ><table width="100%" border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF"> <tr> <td valign="top"> <table width="100%" border="0" cellspacing="0" cellpadding="0" align="center" bgcolor="#FFFFFF"> <tr> <td valign="top"> <span class="pt9-black"> </span><span class="zhongdian">15. MenuItem<a name="01"></a></span><span class="pt9-black"><br> <br> MenuItem是菜单树中的"叶子节点"。MenuItem通常被添加到一个Menu中。对于MenuItem对象可以添加ActionListener，使其能够完成相应的操作。<br> Menu m1 = new Menu("File");<br> MenuItem mi1 = new MenuItem("Save");<br> MenuItem mi2 = new MenuItem("Load");<br> MenuItem mi3 = new MenuItem("Quit");<br> <br> m1.add(mi1);<br> m1.add(mi2);<br> m1.addSeparator(); <br> m1.add(mi3);</span><br> <br> <span class="pt9-black"><a href="#01" ><font color="#FF0000" onClick="MM_openBrWindow('tanchu3.htm','','width=155,height=121')">查看运行结果</font></a><br> <br> MenuBar和Menu都没有必要注册监听器，只需要对MenuItem添加监听器ActionListener，完成相应操作。<br> <br> </span><span class="zhongdian">16. 组件与监听器的对应关系<a name="02"></a></span><span class="pt9-black"><br> <br> 下表中列出了各个组件与所有的监听器的对应关系，打上"<img src="../../../images/tu/ch05/gou.gif" width="11" height="14" align="absbottom">"表明该组件可以注册此种监听器。<br> <br> <font color="000099">表5.2</font><br> <br> </span> <table width="90%" border="0" cellspacing="1" cellpadding="0" align="center" bgcolor="#006633"> <tr bgcolor="#C1FFE0"> <td width="19%" class="pt9-black"><b> 监听器接口</b></td> <td width="7%" class="pt9-black"> <div align="center">Act</div> </td> <td width="7%" class="pt9-black"> <div align="center">Adj</div> </td> <td width="7%" class="pt9-black"> <div align="center">Cmp</div> </td> <td width="7%" class="pt9-black"> <div align="center">Cnt</div> </td> <td width="7%" class="pt9-black"> <div align="center">Foc</div> </td> <td width="7%" class="pt9-black"> <div align="center">Itm</div> </td> <td width="7%" class="pt9-black"> <div align="center">Key</div> </td> <td width="7%" class="pt9-black"> <div align="center">Mou</div> </td> <td width="7%" class="pt9-black"> <div align="center">MM</div> </td> <td width="7%" class="pt9-black"> <div align="center">Text</div> </td> <td width="7%" class="pt9-black"> <div align="center">Win</div> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="19%" height="17" class="pt9-black"> Button</td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"></div> </td> <td width="7%" height="17" class="pt9-black"> <div align="center"></div> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="19%" class="pt9-black"> Canvas</td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="19%" class="pt9-black"> Checkbox</td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="19%" class="pt9-black">CheckboxMenuItem</td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="19%" class="pt9-black"> Choice</td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> <div align="center"><img src="../../../images/tu/ch05/gou.gif" width="11" height="14"></div> </td> <td width="7%" class="pt9-black"> ⌨️ 快捷键说明
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