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| <div class="breadcrumb"><a class="nav" href="s6.html" rel="section">§6 Object Teams API</a> > <a class="nav" href="s6.2.html" rel="section">§6.2 Other API Elements</a></div> |
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| <h4 class="subsect">§6.2.(a) <span class="title">Interfaces for role encapsulation</span><a class="img" href="s6.2.a.html" |
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| <p>A set of pre-defined types exist that do <span class="underline">not</span> extend <code>java.lang.Object</code> |
| and have <span class="underline">no</span> features except the operators <code>==</code> and <code>!=</code>. |
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| </p> |
| <div class="note"> |
| <h5>Note:</h5> |
| The JLS defines that each interface declares all methods defined in <code>java.lang.Object</code> |
| (<a href="http://java.sun.com/docs/books/jls/second_edition/html/interfaces.doc.html#32392" |
| class="ext">JLS §9.2</a>) |
| and also each object referenced by an interface type can be widened to <code>java.lang.Object</code>. |
| Compilers commonly implement this by declaring <code>java.lang.Object</code> the super-type of all interfaces. |
| Such implementation has no visible difference with respect to the more complex definition in the JLS. |
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| </div> |
| <p>These predefined types are |
| |
| </p> |
| <dl> |
| <dt><code>org.objectteams.IConfined</code></dt> |
| <dd>regular interface</dd> |
| <dt><code>org.objectteams.ITeam.IConfined</code></dt> |
| <dd>role interface</dd> |
| <dt><code>org.objectteams.Team.Confined</code></dt> |
| <dd>role class</dd> |
| </dl> |
| <p>These types provide no new functionality but inheriting from these types influences the semantics with respect to encapsulation. |
| |
| The purpose and usage of these types is described in <a href="s7.html" title="§7 Role Encapsulation" class="sect">§7</a>. |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3.1 — last modified: 2013-05-28 |
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