slide0017.htm

来自「用java 编写的十分基础的几个简单类」· HTM 代码 · 共 113 行

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<title>Object Assignment</title>
<meta name=Description content="10/30/2003: Method overloading">
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 <div v:shape="_x0000_s24578" class=T style='position:absolute;top:6.25%;
 left:5.99%;width:88.2%;height:10.0%'><span lang=EN-US style='mso-fareast-language:
 ZH-CN'>Method overloading</span></div>
 <div v:shape="_x0000_s24579">
 <div class=B style='position:absolute;top:16.25%;left:2.62%;width:94.0%;
 height:7.5%'><span style='position:absolute;top:0%;left:3.98%;width:96.01%;
 height:100.0%'><span class=BB style='position:absolute;left:-4.14%;top:.49em'>n</span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'>Overloading with primitives&#13;</span></span></div>
 <div class=B1><span style='position:absolute;top:24.5%;left:10.86%;width:88.57%;
 height:6.5%'><span class=B1B style='position:absolute;left:-3.59%;top:.49em'>n</span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'>When the same method name is
 used with </span></span><span style='position:absolute;top:30.75%;left:10.86%;
 width:86.14%;height:6.5%'><span lang=EN-US style='mso-fareast-language:ZH-CN'>different
 argument types or with different </span></span><span style='position:absolute;
 top:37.0%;left:10.86%;width:85.95%;height:6.5%'><span lang=EN-US
 style='mso-fareast-language:ZH-CN'>number of arguments&#13;</span></span></div>
 <div class=B1><span style='position:absolute;top:44.5%;left:10.86%;width:93.07%;
 height:6.5%'><span class=B1B style='position:absolute;left:-3.42%;top:.49em'>n</span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'>Rule: if no matching method is
 found smaller </span></span><span style='position:absolute;top:50.75%;
 left:10.86%;width:97.56%;height:6.5%'><span lang=EN-US style='mso-fareast-language:
 ZH-CN'>types are cast into bigger type (widening, ie an </span></span><span
 style='position:absolute;top:57.0%;left:10.86%;width:85.95%;height:6.5%'><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><i>int</i></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'> to a </span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'><i>float</i></span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'>, a </span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'><i>char</i></span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'> into an </span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'><i>int</i></span><span lang=EN-US
 style='mso-fareast-language:ZH-CN'>, etc)&#13;</span></span></div>
 <div class=B1><span style='position:absolute;top:64.5%;left:10.86%;width:102.43%;
 height:6.5%'><span class=B1B style='position:absolute;left:-3.1%;top:.49em'>n</span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'>If the opposite needs to happen
 (ie a narrowing), </span></span><span style='position:absolute;top:70.75%;
 left:10.86%;width:85.95%;height:6.5%'><span lang=EN-US style='mso-fareast-language:
 ZH-CN'>an explicit cast must be performed</span></span></div>
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