ui/r3_8/Java7news/whats-new-java-7.html - gerrit/www.eclipse.org/jdt - Git at Google

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   </style>
 <title>What's new for Java 7</title>
 </head>

 <body>
 <h1>What's new for Java 7</h1>

 <p>
 Java 7 comes with a set of <a href="http://download.oracle.com/javase/7/docs/technotes/guides/language/enhancements.html#javase7">small enhancements</a>
 to the Java language (aka Project Coin), a new byte code to dynamically invoke methods
 and many additions to the libraries. The Eclipse compiler implements all the new features of Java 7 and all Eclipse JDT features like e.g. search
 and refactoring have been updated to support Java 7. Besides that, some new features got added:
 </p>

 <ul>
   <li><a href="#diamond">Improved Type Inference for Generic Instance Creation (Diamond)</a></li>
   <li><a href="#Multi-catch">Multi-catch</a></li>
   <li><a href="#try-with-resources"><code>try</code>-with-resources statement</a></li>
   <li><a href="#simplified-varargs-method-invocation">Simplified Varargs Method Invocation</a></li>
   <li><a href="#strings-in-switch">Strings in switch</a></li>
   <li><a href="#polymorphic-methods">Polymorphic Methods</a></li>
   <li><a href="#miscellaneous">Miscellaneous</a></li>
 </ul>

 <table class="news" border="0" cellpadding="10" cellspacing="0" width="80%" summary="news entries">

   <tr>
     <td id="diamond" class="section" colspan="2">
       Improved Type Inference for Generic Instance Creation (Diamond)
     </td>
   </tr>

   <tr id="content-assist-diamond">
     <td class="title">Content assist inserts diamond</td>
     <td class="content">
         Where possible, content assist for constructor invocations now inserts a diamond instead of explicit type arguments.

         <p><img src="images/content-assist-diamond-1.png" alt="Content assist after 'new HashMap'"/></p>
         Result:
         <p><img src="images/content-assist-diamond-2.png" alt="Content assist inserted 'new HashMap&lt;&gt;()'"/></p>
     </td>
   </tr>

   <tr id="redundant-specification-of-type-arguments">
     <td class="title">Detection of redundant type arguments</td>
     <td class="content">
         The compiler can now detect <b>redundant specification of type arguments</b>, which you can remove via the <b>Remove type arguments</b> quick fix.
         <p><img src="images/redundant-specification-of-type-arguments.png" alt="Redundant specification of type arguments"/></p>

         <p>This option is disabled by default but can be enabled on the <b>Java &gt; Compiler &gt; Errors/Warnings</b> preference page:</p>
         <p><img src="images/redundant-type-arguments-warning.png" alt="Redundant type arguments warning"/></p>
     </td>
   </tr>

   <tr id="insert-inferred-type-arguments">
     <td class="title">New Insert inferred type arguments quick assist</td>
     <td class="content">
         You can <b>insert inferred type arguments</b> of a diamond via a quick assist.
         <p><img src="images/insert-inferred-type-arguments.png" alt="Insert inferred type arguments"/></p>
         <p>Hint: This also works as a quick fix in 1.5 and 1.6 code, where the diamond is a syntax error.</p>
     </td>
   </tr>

   <tr>
     <td id="Multi-catch" class="section" colspan="2">
       Multi-catch
     </td>
   </tr>

   <tr id="surround-with-try-multicatch">
     <td class="title">New Surround with try/multi-catch quick fix</td>
     <td class="content">
         The new action <b>Source > Surround With > Try/multi-catch Block</b> allows you to surround selected statements with a try/multi-catch block.
         This is also available as <b>Surround with try/multi-catch</b> quick fix in case there are multiple uncaught exceptions.
         <p><img src="images/surround-with-try-multicatch.png" alt="Surround with try/multi-catch"/></p>
     </td>
   </tr>

   <tr id="add-exceptions-to-existin-catch-clause">
     <td class="title">New Add exceptions to existing catch clause quick fix</td>
     <td class="content">
         The new <b>Add exceptions to existing catch clause</b> quick fix allows you to add uncaught exceptions to an existing catch clause.
         <p><img src="images/add-exceptions-to-existin-catch-clause.png" alt="Add exceptions to existing catch clause"/></p>
     </td>
   </tr>

   <tr id="use-separate-catch-blocks">
     <td class="title">New Use separate catch blocks quick assist</td>
     <td class="content">
         The new <b>Use separate catch blocks</b> quick assist allows you to replace a multi-catch clause with individual catch blocks,
         one for each exception in the multi-catch clause.
         <p><img src="images/use-separate-catch-blocks.png" alt="Use separate catch blocks"/></p>
     </td>
   </tr>

   <tr id="move-exceptions-to-separate-catch-block">
     <td class="title">New Move exceptions to separate catch block quick assist</td>
     <td class="content">
         The new <b>Move exceptions to separate catch block</b> quick assist allows you to pick out one or more selected exceptions from a multi-catch clause.
         <p><img src="images/move-exceptions-to-separate-catch-block.png" alt="Move exceptions to separate catch block"/></p>
     </td>
   </tr>

   <tr id="combine-catch-blocks">
     <td class="title">New Combine catch blocks quick assist</td>
     <td class="content">
         The new <b>Combine catch blocks</b> quick assist allows you to combine separate catch blocks into a single multi-catch block.
         The quick assist is offered only when bodies of all the catch blocks are same.
         <p><img src="images/combine-catch-blocks.png" alt="Combine catch blocks"/></p>
     </td>
   </tr>

   <tr id="remove-exception">
     <td class="title">New Remove exception quick fix</td>
     <td class="content">
         The compiler gives an error if an exception in a multi-catch clause is already caught by an alternative exception.
         The new <b>Remove exception</b> quick fix allows you to remove this exception.
         <p><img src="images/remove-exception.png" alt="Remove exception"/></p>
     </td>
   </tr>

   <tr id="throwing-exception">
     <td class="title">Mark Occurrences</td>
     <td class="content">
         <b>Mark Occurrences</b> has been updated to understand the multi-catch syntax.
         <p><img src="images/throwing-exception.png" alt="Mark Occurrences"/></p>
     </td>
   </tr>

   <tr id="formatter-multi-catch">
     <td class="title">Formatter</td>
     <td class="content">
         There are new <b>Line Wrapping options</b> in the formatter for the multi-catch syntax.

         <p>These can be configured on <b>Java &gt; Code Style &gt; Formatter</b> preference page under
         <b>Line Wrapping &gt; Statements &gt; 'multi-catch'</b>. </p>
     </td>
   </tr>

   <tr>
     <td id="try-with-resources" class="section" colspan="2">
       try-with-resources statement
     </td>
   </tr>

   <tr id="unhandled-exceptions-thrown-by-automatic-close">
     <td class="title">Detection of unhandled exceptions thrown by automatic close()</td>
     <td class="content">
         The compiler detects unhandled exceptions thrown by automatic <code>close()</code> invocation on a resource.
         <p><img src="images/unhandled-exception-thrown-by-automatic-close.png" alt="Detection of unhandled exceptions thrown by automatic close()"/></p>
     </td>
   </tr>

   <tr id="mark-occurrences-exception-thrown-by-automatic-close">
     <td class="title">Mark Occurrences</td>
     <td class="content">
         <b>Mark Occurrences</b> has been updated to understand the <code>try</code>-with-resources syntax.

         <p>The closing '}' of a <code>try</code>-with-resources statement is marked as a method exit point if the implicit <code>close()</code>
         invocation throws an exception. The corresponding resource variable is also highlighted.</p>
         <p><img src="images/mark-occurrences-exception-thrown-by-automatic-close.png" alt="Mark Occurrences"/></p>
     </td>
   </tr>

   <tr id="formatter-try-with-resources">
     <td class="title">Formatter</td>
     <td class="content">
         There are new <b>Line Wrapping and White Space options</b> in the formatter for the <code>try</code>-with-resources syntax.

         <p>These can be configured on <b>Java &gt; Code Style &gt; Formatter</b> preference page under
         <b>Line Wrapping &gt; Statements &gt; 'try-with-resources'</b> and <b>White Space &gt; Control Statements &gt; 'try-with-resources'</b>.</p>
     </td>
   </tr>

   <tr>
     <td id="simplified-varargs-method-invocation" class="section" colspan="2">
       Simplified Varargs Method Invocation
     </td>
   </tr>

   <tr id="add-safevarargs">
     <td class="title">New Add @SafeVarargs quick fix</td>
     <td class="content">
         The new <b>Add @SafeVarargs</b> quick fix is offered for potential heap pollution warnings on method declarations.
         <p><img src="images/add-safevarargs.png" alt="Add @SafeVarargs"/></p>

         <p>The quick fix is also offered from call sites.</p>
         <p><img src="images/add-safevarargs-to-declaration.png" alt="Add @SafeVarargs to declaration"/></p>
     </td>
   </tr>

   <tr id="remove-safevarargs">
     <td class="title">New Remove @SafeVarargs quick fix</td>
     <td class="content">
         The new <b>Remove @SafeVarargs</b> quick fix is offered for incorrect usage of @SafeVarargs annotation.
         <p><img src="images/remove-safevarargs-1.png" alt="Remove @SafeVarargs"/></p>
         <p><img src="images/remove-safevarargs-2.png" alt="Remove @SafeVarargs"/></p>
     </td>
   </tr>

   <tr>
     <td id="strings-in-switch" class="section" colspan="2">
       Strings in switch
     </td>
   </tr>

   <tr id="convert-switch-to-if-else">
     <td class="title">Convert 'switch' to 'if-else' quick assist</td>
     <td class="content">
         The <b>Convert 'switch' to 'if-else'</b> quick assist has been updated for strings in switch.
         <p><img src="images/convert-switch-to-if-else.png" alt="Convert 'switch' to 'if-else' quick assist"/></p>
         <p>Note that the quick assist avoids a NullPointerException in the resultant code.</p>
     </td>
   </tr>

   <tr>
     <td id="polymorphic-methods" class="section" colspan="2">
       Polymorphic Methods
     </td>
   </tr>

   <tr id="invokeExact-javadoc">
     <td class="title">Polymorphic method signature in Javadoc hover</td>
     <td class="content">
         Javadoc hovers for references to
         <a href="http://download.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandle.html#sigpoly">polymorphic methods</a>
         show the actually used method signature.
         <p><img src="images/invokeExact-javadoc.png" alt="Polymorphic method signature in javadoc hover"/></p>
     </td>
   </tr>

   <tr>
     <td id="miscellaneous" class="section" colspan="2">
       Miscellaneous
     </td>
   </tr>

       <tr id="debug-evaluation-1-7">
         <td class="title">Evaluation support for Java 7</td>
         <td class="content">
           The evaluation engine in JDT debug has been updated to support Java 7.
           <p>
           You can now use all of the new code structures from Java 7 in:
           <ul>
            <li>Display / Inspect actions</li>
            <li>Display view</li>
            <li>Assign variable value operations</li>
            <li>Breakpoint conditions</li>
           </ul>
           </p>
           For example, switch on string is supported in breakpoint conditions:
           <p>
           <img src="images/bp-condition.png" alt="Breakpoint condition example using switch on string"/>
           </p>
         </td>
       </tr>

       <tr id="ee-description">
         <td class="title">Execution environment for Java 7</td>
         <td class="content">
          When configuring JREs and execution environments, you now have the ability to configure a Java 7 execution environment:
          <p>
             <img src="images/ee-page.png" alt="The execution environments preference page"/>
          </p>
         </td>
       </tr>

       <tr id="assign-value">
         <td class="title">Assign variable value support for Java 7</td>
         <td class="content">
           The feature for changing the value of a variable while debugging has been updated for Java 7 to support underscores in literals
           and binary literals:
           <p>
             <img src="images/assign-vars.png" alt="An example of assigning a binary literal with underscores to an int"/>
           </p>
         </td>
       </tr>


      <tr id="ee-description">
         <td class="title">API Tools support for Java 7</td>
         <td class="content">
           The execution environment description for Java 7 is available from the corresponding <a href="http://wiki.eclipse.org/Eclipse_Project_Update_Sites">update site</a>.
           After installing it, one can detect invalid references to Java 7 system libraries:
           <p>
             <img src="images/pde-api-pref-page.png" alt="The API Errors/Warnings preference page showing the new Java 7 EE description"/>
           </p>
         </td>
       </tr>

   <tr>
     <td colspan="2"/>
   </tr>

 </table>
 </body>
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	table.news tr td.title {vertical-align: top; width: 30%; font-weight: bold;}
	table.news tr td.content {vertical-align: top; width: 70%;}
	</style>
	<title>What's new for Java 7</title>
	</head>

	<body>
	<h1>What's new for Java 7</h1>

	<p>
	Java 7 comes with a set of <a href="http://download.oracle.com/javase/7/docs/technotes/guides/language/enhancements.html#javase7">small enhancements</a>
	to the Java language (aka Project Coin), a new byte code to dynamically invoke methods
	and many additions to the libraries. The Eclipse compiler implements all the new features of Java 7 and all Eclipse JDT features like e.g. search
	and refactoring have been updated to support Java 7. Besides that, some new features got added:
	</p>

	<ul>
	<li><a href="#diamond">Improved Type Inference for Generic Instance Creation (Diamond)</a></li>
	<li><a href="#Multi-catch">Multi-catch</a></li>
	<li><a href="#try-with-resources"><code>try</code>-with-resources statement</a></li>
	<li><a href="#simplified-varargs-method-invocation">Simplified Varargs Method Invocation</a></li>
	<li><a href="#strings-in-switch">Strings in switch</a></li>
	<li><a href="#polymorphic-methods">Polymorphic Methods</a></li>
	<li><a href="#miscellaneous">Miscellaneous</a></li>
	</ul>

	<table class="news" border="0" cellpadding="10" cellspacing="0" width="80%" summary="news entries">

	<tr>
	<td id="diamond" class="section" colspan="2">
	Improved Type Inference for Generic Instance Creation (Diamond)
	</td>
	</tr>

	<tr id="content-assist-diamond">
	<td class="title">Content assist inserts diamond</td>
	<td class="content">
	Where possible, content assist for constructor invocations now inserts a diamond instead of explicit type arguments.

	<p><img src="images/content-assist-diamond-1.png" alt="Content assist after 'new HashMap'"/></p>
	Result:
	<p><img src="images/content-assist-diamond-2.png" alt="Content assist inserted 'new HashMap<>()'"/></p>
	</td>
	</tr>

	<tr id="redundant-specification-of-type-arguments">
	<td class="title">Detection of redundant type arguments</td>
	<td class="content">
	The compiler can now detect <b>redundant specification of type arguments</b>, which you can remove via the <b>Remove type arguments</b> quick fix.
	<p><img src="images/redundant-specification-of-type-arguments.png" alt="Redundant specification of type arguments"/></p>

	<p>This option is disabled by default but can be enabled on the <b>Java > Compiler > Errors/Warnings</b> preference page:</p>
	<p><img src="images/redundant-type-arguments-warning.png" alt="Redundant type arguments warning"/></p>
	</td>
	</tr>

	<tr id="insert-inferred-type-arguments">
	<td class="title">New Insert inferred type arguments quick assist</td>
	<td class="content">
	You can <b>insert inferred type arguments</b> of a diamond via a quick assist.
	<p><img src="images/insert-inferred-type-arguments.png" alt="Insert inferred type arguments"/></p>
	<p>Hint: This also works as a quick fix in 1.5 and 1.6 code, where the diamond is a syntax error.</p>
	</td>
	</tr>

	<tr>
	<td id="Multi-catch" class="section" colspan="2">
	Multi-catch
	</td>
	</tr>

	<tr id="surround-with-try-multicatch">
	<td class="title">New Surround with try/multi-catch quick fix</td>
	<td class="content">
	The new action <b>Source > Surround With > Try/multi-catch Block</b> allows you to surround selected statements with a try/multi-catch block.
	This is also available as <b>Surround with try/multi-catch</b> quick fix in case there are multiple uncaught exceptions.
	<p><img src="images/surround-with-try-multicatch.png" alt="Surround with try/multi-catch"/></p>
	</td>
	</tr>

	<tr id="add-exceptions-to-existin-catch-clause">
	<td class="title">New Add exceptions to existing catch clause quick fix</td>
	<td class="content">
	The new <b>Add exceptions to existing catch clause</b> quick fix allows you to add uncaught exceptions to an existing catch clause.
	<p><img src="images/add-exceptions-to-existin-catch-clause.png" alt="Add exceptions to existing catch clause"/></p>
	</td>
	</tr>

	<tr id="use-separate-catch-blocks">
	<td class="title">New Use separate catch blocks quick assist</td>
	<td class="content">
	The new <b>Use separate catch blocks</b> quick assist allows you to replace a multi-catch clause with individual catch blocks,
	one for each exception in the multi-catch clause.
	<p><img src="images/use-separate-catch-blocks.png" alt="Use separate catch blocks"/></p>
	</td>
	</tr>

	<tr id="move-exceptions-to-separate-catch-block">
	<td class="title">New Move exceptions to separate catch block quick assist</td>
	<td class="content">
	The new <b>Move exceptions to separate catch block</b> quick assist allows you to pick out one or more selected exceptions from a multi-catch clause.
	<p><img src="images/move-exceptions-to-separate-catch-block.png" alt="Move exceptions to separate catch block"/></p>
	</td>
	</tr>

	<tr id="combine-catch-blocks">
	<td class="title">New Combine catch blocks quick assist</td>
	<td class="content">
	The new <b>Combine catch blocks</b> quick assist allows you to combine separate catch blocks into a single multi-catch block.
	The quick assist is offered only when bodies of all the catch blocks are same.
	<p><img src="images/combine-catch-blocks.png" alt="Combine catch blocks"/></p>
	</td>
	</tr>

	<tr id="remove-exception">
	<td class="title">New Remove exception quick fix</td>
	<td class="content">
	The compiler gives an error if an exception in a multi-catch clause is already caught by an alternative exception.
	The new <b>Remove exception</b> quick fix allows you to remove this exception.
	<p><img src="images/remove-exception.png" alt="Remove exception"/></p>
	</td>
	</tr>

	<tr id="throwing-exception">
	<td class="title">Mark Occurrences</td>
	<td class="content">
	<b>Mark Occurrences</b> has been updated to understand the multi-catch syntax.
	<p><img src="images/throwing-exception.png" alt="Mark Occurrences"/></p>
	</td>
	</tr>

	<tr id="formatter-multi-catch">
	<td class="title">Formatter</td>
	<td class="content">
	There are new <b>Line Wrapping options</b> in the formatter for the multi-catch syntax.

	<p>These can be configured on <b>Java > Code Style > Formatter</b> preference page under
	<b>Line Wrapping > Statements > 'multi-catch'</b>. </p>
	</td>
	</tr>

	<tr>
	<td id="try-with-resources" class="section" colspan="2">
	try-with-resources statement
	</td>
	</tr>

	<tr id="unhandled-exceptions-thrown-by-automatic-close">
	<td class="title">Detection of unhandled exceptions thrown by automatic close()</td>
	<td class="content">
	The compiler detects unhandled exceptions thrown by automatic <code>close()</code> invocation on a resource.
	<p><img src="images/unhandled-exception-thrown-by-automatic-close.png" alt="Detection of unhandled exceptions thrown by automatic close()"/></p>
	</td>
	</tr>

	<tr id="mark-occurrences-exception-thrown-by-automatic-close">
	<td class="title">Mark Occurrences</td>
	<td class="content">
	<b>Mark Occurrences</b> has been updated to understand the <code>try</code>-with-resources syntax.

	<p>The closing '}' of a <code>try</code>-with-resources statement is marked as a method exit point if the implicit <code>close()</code>
	invocation throws an exception. The corresponding resource variable is also highlighted.</p>
	<p><img src="images/mark-occurrences-exception-thrown-by-automatic-close.png" alt="Mark Occurrences"/></p>
	</td>
	</tr>

	<tr id="formatter-try-with-resources">
	<td class="title">Formatter</td>
	<td class="content">
	There are new <b>Line Wrapping and White Space options</b> in the formatter for the <code>try</code>-with-resources syntax.

	<p>These can be configured on <b>Java > Code Style > Formatter</b> preference page under
	<b>Line Wrapping > Statements > 'try-with-resources'</b> and <b>White Space > Control Statements > 'try-with-resources'</b>.</p>
	</td>
	</tr>

	<tr>
	<td id="simplified-varargs-method-invocation" class="section" colspan="2">
	Simplified Varargs Method Invocation
	</td>
	</tr>

	<tr id="add-safevarargs">
	<td class="title">New Add @SafeVarargs quick fix</td>
	<td class="content">
	The new <b>Add @SafeVarargs</b> quick fix is offered for potential heap pollution warnings on method declarations.
	<p><img src="images/add-safevarargs.png" alt="Add @SafeVarargs"/></p>

	<p>The quick fix is also offered from call sites.</p>
	<p><img src="images/add-safevarargs-to-declaration.png" alt="Add @SafeVarargs to declaration"/></p>
	</td>
	</tr>

	<tr id="remove-safevarargs">
	<td class="title">New Remove @SafeVarargs quick fix</td>
	<td class="content">
	The new <b>Remove @SafeVarargs</b> quick fix is offered for incorrect usage of @SafeVarargs annotation.
	<p><img src="images/remove-safevarargs-1.png" alt="Remove @SafeVarargs"/></p>
	<p><img src="images/remove-safevarargs-2.png" alt="Remove @SafeVarargs"/></p>
	</td>
	</tr>

	<tr>
	<td id="strings-in-switch" class="section" colspan="2">
	Strings in switch
	</td>
	</tr>

	<tr id="convert-switch-to-if-else">
	<td class="title">Convert 'switch' to 'if-else' quick assist</td>
	<td class="content">
	The <b>Convert 'switch' to 'if-else'</b> quick assist has been updated for strings in switch.
	<p><img src="images/convert-switch-to-if-else.png" alt="Convert 'switch' to 'if-else' quick assist"/></p>
	<p>Note that the quick assist avoids a NullPointerException in the resultant code.</p>
	</td>
	</tr>

	<tr>
	<td id="polymorphic-methods" class="section" colspan="2">
	Polymorphic Methods
	</td>
	</tr>

	<tr id="invokeExact-javadoc">
	<td class="title">Polymorphic method signature in Javadoc hover</td>
	<td class="content">
	Javadoc hovers for references to
	<a href="http://download.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandle.html#sigpoly">polymorphic methods</a>
	show the actually used method signature.
	<p><img src="images/invokeExact-javadoc.png" alt="Polymorphic method signature in javadoc hover"/></p>
	</td>
	</tr>

	<tr>
	<td id="miscellaneous" class="section" colspan="2">
	Miscellaneous
	</td>
	</tr>

	<tr id="debug-evaluation-1-7">
	<td class="title">Evaluation support for Java 7</td>
	<td class="content">
	The evaluation engine in JDT debug has been updated to support Java 7.
	<p>
	You can now use all of the new code structures from Java 7 in:
	<ul>
	<li>Display / Inspect actions</li>
	<li>Display view</li>
	<li>Assign variable value operations</li>
	<li>Breakpoint conditions</li>
	</ul>
	</p>
	For example, switch on string is supported in breakpoint conditions:
	<p>
	<img src="images/bp-condition.png" alt="Breakpoint condition example using switch on string"/>
	</p>
	</td>
	</tr>

	<tr id="ee-description">
	<td class="title">Execution environment for Java 7</td>
	<td class="content">
	When configuring JREs and execution environments, you now have the ability to configure a Java 7 execution environment:
	<p>
	<img src="images/ee-page.png" alt="The execution environments preference page"/>
	</p>
	</td>
	</tr>

	<tr id="assign-value">
	<td class="title">Assign variable value support for Java 7</td>
	<td class="content">
	The feature for changing the value of a variable while debugging has been updated for Java 7 to support underscores in literals
	and binary literals:
	<p>
	<img src="images/assign-vars.png" alt="An example of assigning a binary literal with underscores to an int"/>
	</p>
	</td>
	</tr>


	<tr id="ee-description">
	<td class="title">API Tools support for Java 7</td>
	<td class="content">
	The execution environment description for Java 7 is available from the corresponding <a href="http://wiki.eclipse.org/Eclipse_Project_Update_Sites">update site</a>.
	After installing it, one can detect invalid references to Java 7 system libraries:
	<p>
	<img src="images/pde-api-pref-page.png" alt="The API Errors/Warnings preference page showing the new Java 7 EE description"/>
	</p>
	</td>
	</tr>

	<tr>
	<td colspan="2"/>
	</tr>

	</table>
	</body>
	</html>