4.21/jdt.html - gerrit/www.eclipse.org/eclipse/news - Git at Google

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 <title>Eclipse Project 4.21 - New and Noteworthy</title>
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 <body>
 <h2>Java development tools</h2>
 <ul>
 	<!--<li><a href="#JavaXX">Java&trade; XX Support</a></li>-->
 	<li><a href="#JUnit">JUnit</a></li>
 	<li><a href="#JavaEditor">Java Editor</a></li>
 	<li><a href="#JavaViewsAndDialogs">Java Views and Dialogs</a></li>
 	<li><a href="#JavaFormatter">Java Formatter</a></li>
 	<li><a href="#Debug">Debug</a></li>
 	<li><a href="#JDTDev">JDT Developers</a></li>
 </ul>

 <!-- ****************** START OF N&N TABLE ****************** -->
 <table class="news">
 <colgroup>
   <col class="title" />
   <col />
 </colgroup>
 <tbody>

   <!-- ******************* Java XX Support ************************************* -->
   <!--
   <tr>
     <td id="JavaXX" class="section" colspan="2">
     <h2>Java&trade; XX Support </h2>
     </td>
   </tr>
   -->
   <!-- ******************* End of Java XX Support ************************************* -->

   <!-- ******************* JUnit ************************************* -->
   <tr>
     <td id="JUnit" class="section" colspan="2">
     <h2>JUnit</h2>
     </td>
   </tr>
   <!-- ******************* End of JUnit ************************************* -->

   <!-- ******************* Java Editor ************************************* -->
   <tr>
     <td id="JavaEditor" class="section" colspan="2">
     <h2>Java Editor </h2>
     </td>
   </tr>

   <tr id="stringbuffer-to-stringbuilder"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=569835 -->
     <td class="title"><a href="#stringbuffer-to-stringbuilder">Use StringBuilder instead of StringBuffer clean up</a></td>
     <td class="content">
       A new clean up has been added that converts code to use <code>StringBuilder</code> (added in Java 1.5) rather than <code>StringBuffer</code> which has synchronized methods and is slower than using <code>StringBuilder</code>.
       <p>
         There is a sub-option where changes will only occur to local variables which is on by default.  When this sub-option is on, changes will only occur to <code>StringBuffer</code> variables that are local to a method.  When a method calls other methods with such variables or assigns to/from fields/parameters, the method contents will not be converted.  It is permitted to append <code>StringBuffer</code> fields or parameters to local <code>StringBuffer</code> variables which can then still be converted to <code>StringBuilder</code>.
       </p>
       <p>
       When the option is selected and the sub-option for local variables is off,all usage of <code>StringBuffer</code> in the selected files are changed to <code>StringBuilder</code> regardless of usage.  It should be noted that in this case, the clean up will not track down non-selected classes and methods that are referenced and might require changes to compile successfully.
       </p>
       <p>
         To apply the clean up, select the <b>Use StringBuilder instead of StringBuffer</b> check box on the <b>Optimization</b> tab in your clean up profile.  To specify just for local variables, select the <b>Only for local variables</b> check box found just below.
       </p>
       <p><img src="images/stringbuffer-to-stringbuilder-prefs.png" alt="Preferences" width="800"/></p>
       <p>
         For the given code:
       </p>
       <p><img src="images/stringbuffer-to-stringbuilder-before.png" alt="Before"/></p>
       <p>
         One gets:
       </p>
       <p><img src="images/stringbuffer-to-stringbuilder-after.png" alt="After"/></p>
     </td>
   </tr>

   <tr id="create-permitted-type-declaration"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=573980 -->
     <td class="title"><a href="#declare-sealed-interface-as-super-interface">Quick fix to declare sealed interface as super interface</a></td>
     <td class="content">
       You can use the following quick fix (<b>Ctrl+1</b>) to declare a sealed interface as super interface of its permitted types:
       <p><img src="images/declare-sealed-interface-as-super-interface.png" alt=""/></p>
       <p>
       </p>
     </td>
   </tr>
   <tr id="add-to-permitted-types"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=574526 -->
     <td class="title"><a href="#add-sub -type-as-permitted -type-of-sealed-type">Quick fix to add the sub type to permitted types of sealed super type</a></td>
     <td class="content">
       You can use the following quick fix (<b>Ctrl+1</b>) to add a sub type to permitted types of a sealed super type:
       <p><img src="images/add-subtype-to-permitted-types-of-supertype.png" alt=""/></p>
       <p>
       </p>
     </td>
   </tr>

   <!-- ******************* End of Java Editor ************************************* -->

   <!-- ******************* Java Views and Dialogs ************************************* -->
   <tr>
     <td id="JavaViewsAndDialogs" class="section" colspan="2">
     <h2>Java Views and Dialogs</h2>
     </td>
   </tr>
   <!-- ******************* End of Java Views and Dialogs ************************************* -->

   <!-- ******************* Java Compiler ************************************* -->
   <tr>
     <td id="JavaCompiler" class="section" colspan="2">
     <h2>Java Compiler</h2>
     </td>
   </tr>
   <!-- ******************* End of Java Compiler ************************************* -->

   <!-- ******************* Java Formatter ************************************* -->
   <tr>
     <td id="JavaFormatter" class="section" colspan="2">
     <h2>Java Formatter </h2>
     </td>
   </tr>
   <!-- ******************* End of Java Formatter ************************************* -->

   <!-- *********************** Debug ******************************** -->
   <tr>
     <td id="Debug" class="section" colspan="2">
     <h2>Debug</h2>
     </td>
   </tr>
   <!--************************ End of Debug ******************************** -->

   <!-- *********************** JDT Developers ******************************** -->
   <tr>
     <td id="JDTDev" class="section" colspan="2">
     <h2>JDT Developers</h2>
     </td>
   </tr>
   <!-- *********************** End of JDT Developers ******************************** -->
 </tbody>
 </table>
 <!-- ****************** END OF N&N TABLE ****************** -->

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     <a href="platform.php">Previous</a> <a style="margin:1em" href=".">Up</a> <a href="platform_isv.php">Next</a>
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	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta name="copyright" content="Copyright (c) Eclipse contributors and others 2018, 2019. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page."/>
	<meta http-equiv="Content-Language" content="en-us"/>
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	body {max-width: 900px;}
	table.news col.title {width: 30%;}
	/img {max-width: 520px;}/
	table.news {table-layout: fixed; border-collapse: collapse; width: 100%;}
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	table.news tr {vertical-align: top;}
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	table.news tr td.title {vertical-align: top; font-weight: bold;}
	table.news tr td.content {vertical-align: top;}
	ul {padding-left: 13px;}
	</style>
	<title>Eclipse Project 4.21 - New and Noteworthy</title>
	</head>

	<body>
	<h2>Java development tools</h2>
	<ul>
	<!--<li><a href="#JavaXX">Java™ XX Support</a></li>-->
	<li><a href="#JUnit">JUnit</a></li>
	<li><a href="#JavaEditor">Java Editor</a></li>
	<li><a href="#JavaViewsAndDialogs">Java Views and Dialogs</a></li>
	<li><a href="#JavaFormatter">Java Formatter</a></li>
	<li><a href="#Debug">Debug</a></li>
	<li><a href="#JDTDev">JDT Developers</a></li>
	</ul>

	<!-- **************** START OF N&N TABLE **************** -->
	<table class="news">
	<colgroup>
	<col class="title" />
	<col />
	</colgroup>
	<tbody>

	<!-- ***************** Java XX Support *********************************** -->
	<!--
	<tr>
	<td id="JavaXX" class="section" colspan="2">
	<h2>Java™ XX Support </h2>
	</td>
	</tr>
	-->
	<!-- ***************** End of Java XX Support *********************************** -->

	<!-- ***************** JUnit *********************************** -->
	<tr>
	<td id="JUnit" class="section" colspan="2">
	<h2>JUnit</h2>
	</td>
	</tr>
	<!-- ***************** End of JUnit *********************************** -->

	<!-- ***************** Java Editor *********************************** -->
	<tr>
	<td id="JavaEditor" class="section" colspan="2">
	<h2>Java Editor </h2>
	</td>
	</tr>

	<tr id="stringbuffer-to-stringbuilder"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=569835 -->
	<td class="title"><a href="#stringbuffer-to-stringbuilder">Use StringBuilder instead of StringBuffer clean up</a></td>
	<td class="content">
	A new clean up has been added that converts code to use <code>StringBuilder</code> (added in Java 1.5) rather than <code>StringBuffer</code> which has synchronized methods and is slower than using <code>StringBuilder</code>.
	<p>
	There is a sub-option where changes will only occur to local variables which is on by default. When this sub-option is on, changes will only occur to <code>StringBuffer</code> variables that are local to a method. When a method calls other methods with such variables or assigns to/from fields/parameters, the method contents will not be converted. It is permitted to append <code>StringBuffer</code> fields or parameters to local <code>StringBuffer</code> variables which can then still be converted to <code>StringBuilder</code>.
	</p>
	<p>
	When the option is selected and the sub-option for local variables is off,all usage of <code>StringBuffer</code> in the selected files are changed to <code>StringBuilder</code> regardless of usage. It should be noted that in this case, the clean up will not track down non-selected classes and methods that are referenced and might require changes to compile successfully.
	</p>
	<p>
	To apply the clean up, select the <b>Use StringBuilder instead of StringBuffer</b> check box on the <b>Optimization</b> tab in your clean up profile. To specify just for local variables, select the <b>Only for local variables</b> check box found just below.
	</p>
	<p><img src="images/stringbuffer-to-stringbuilder-prefs.png" alt="Preferences" width="800"/></p>
	<p>
	For the given code:
	</p>
	<p><img src="images/stringbuffer-to-stringbuilder-before.png" alt="Before"/></p>
	<p>
	One gets:
	</p>
	<p><img src="images/stringbuffer-to-stringbuilder-after.png" alt="After"/></p>
	</td>
	</tr>

	<tr id="create-permitted-type-declaration"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=573980 -->
	<td class="title"><a href="#declare-sealed-interface-as-super-interface">Quick fix to declare sealed interface as super interface</a></td>
	<td class="content">
	You can use the following quick fix (<b>Ctrl+1</b>) to declare a sealed interface as super interface of its permitted types:
	<p><img src="images/declare-sealed-interface-as-super-interface.png" alt=""/></p>
	<p>
	</p>
	</td>
	</tr>
	<tr id="add-to-permitted-types"> <!-- https://bugs.eclipse.org/bugs/show_bug.cgi?id=574526 -->
	<td class="title"><a href="#add-sub -type-as-permitted -type-of-sealed-type">Quick fix to add the sub type to permitted types of sealed super type</a></td>
	<td class="content">
	You can use the following quick fix (<b>Ctrl+1</b>) to add a sub type to permitted types of a sealed super type:
	<p><img src="images/add-subtype-to-permitted-types-of-supertype.png" alt=""/></p>
	<p>
	</p>
	</td>
	</tr>

	<!-- ***************** End of Java Editor *********************************** -->

	<!-- ***************** Java Views and Dialogs *********************************** -->
	<tr>
	<td id="JavaViewsAndDialogs" class="section" colspan="2">
	<h2>Java Views and Dialogs</h2>
	</td>
	</tr>
	<!-- ***************** End of Java Views and Dialogs *********************************** -->

	<!-- ***************** Java Compiler *********************************** -->
	<tr>
	<td id="JavaCompiler" class="section" colspan="2">
	<h2>Java Compiler</h2>
	</td>
	</tr>
	<!-- ***************** End of Java Compiler *********************************** -->

	<!-- ***************** Java Formatter *********************************** -->
	<tr>
	<td id="JavaFormatter" class="section" colspan="2">
	<h2>Java Formatter </h2>
	</td>
	</tr>
	<!-- ***************** End of Java Formatter *********************************** -->

	<!-- ********************* Debug ****************************** -->
	<tr>
	<td id="Debug" class="section" colspan="2">
	<h2>Debug</h2>
	</td>
	</tr>
	<!--********************** End of Debug ****************************** -->

	<!-- ********************* JDT Developers ****************************** -->
	<tr>
	<td id="JDTDev" class="section" colspan="2">
	<h2>JDT Developers</h2>
	</td>
	</tr>
	<!-- ********************* End of JDT Developers ****************************** -->
	</tbody>
	</table>
	<!-- **************** END OF N&N TABLE **************** -->

	<script type="text/javascript" src="scripts.js"></script>
	<p style="text-align:center">
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