uTools-Manuals/docs/java/javax/swing/UIDefaults.LazyValue.html

<div class="header">
<div class="subTitle">
     javax.swing 
   </div>
<h2 class="title" title="Interface UIDefaults.LazyValue">Interface UIDefaults.LazyValue</h2>
</div><div class="contentContainer">
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>
        所有已知实现类：
       </dt>
<dd>
<span><a href="../../javax/swing/UIDefaults.LazyInputMap.html" title="javax.swing中的类">UIDefaults.LazyInputMap</a> ， <a href="../../javax/swing/UIDefaults.ProxyLazyValue.html" title="javax.swing中的类">UIDefaults.ProxyLazyValue</a></span>
</dd>
</dl>
<dl>
<dt>
         Enclosing class: 
       </dt>
<dd>
<span><a href="../../javax/swing/UIDefaults.html" title="javax.swing中的类">UIDefaults</a></span>
</dd>
</dl>
<hr/> <br/> <pre>public static interface <span class="typeNameLabel">UIDefaults.LazyValue</span></pre>
<div class="block">
<span>此类可以将默认表中的条目存储到第一次使用getXXX(key)之一之前未构建的<code>getXXX(key)</code> 。</span>
<span>懒惰值对于构建或很少检索昂贵的默认值很有用。</span>
<span>一个在第一时间<code>LazyValue</code>被取回它的“真实值”是通过调用计算<code>LazyValue.createValue()</code>和实际数值被用来取代<code>LazyValue</code>在<code>UIDefaults</code>表。</span>
<span>相同键的后续查找返回真实值。</span>
<span>以下是一个<code>LazyValue</code>的例子，它构建了一个<code>Border</code> ：</span>
<pre>  <span>Object borderLazyValue = new UIDefaults.LazyValue() {
      public Object createValue(UIDefaults table) {
          return new BorderFactory.createLoweredBevelBorder();
      }
  };

  uiDefaultsTable.put("MyBorder", borderLazyValue);</span> </pre>
</div>
<dl>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/swing/UIDefaults.html#get-java.lang.Object-"><code>UIDefaults.get(java.lang.Object)</code></a>
</dd>
</dl> </li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- ========== METHOD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="method.summary">
<!-- --> </a> <h3>方法摘要</h3>
<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
<caption>
<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t3"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span>
</caption>
<tbody>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor" id="i0">
<td class="colFirst"><code><a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/swing/UIDefaults.LazyValue.html#createValue-javax.swing.UIDefaults-">createValue</a></span>(<a href="../../javax/swing/UIDefaults.html" title="class in javax.swing">UIDefaults</a> table)</code>
<div class="block">
              创建从 
             <code>UIDefaults</code>表检索的实际值。 
            </div> </td>
</tr>
</tbody>
</table> </li>
</ul> </li>
</ul>
</div>
<div class="details">
<ul class="blockList">
<li class="blockList">
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
<!-- --> </a> <h3>方法详细信息</h3> <a name="createValue-javax.swing.UIDefaults-">
<!-- --> </a>
<ul class="blockListLast">
<li class="blockList"> <h4>createValue</h4> <pre><a href="../../java/lang/Object.html" title="class in java.lang">Object</a> createValue(<a href="../../javax/swing/UIDefaults.html" title="class in javax.swing">UIDefaults</a> table)</pre>
<div class="block">
<span>创建从<code>UIDefaults</code>表检索的实际值。</span>
<span>当从表中检索到实现此接口的对象时，该方法用于创建实际值，然后存储在表中并返回到调用方法。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>table</code> - a 
            <code>UIDefaults</code>表 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             创建的 
            <code>Object</code>
</dd>
</dl> </li>
</ul> </li>
</ul> </li>
</ul>
</div>
</div>