Java的JComboBox详解

末蓝、 2022-04-10 12:08 217阅读 0赞

**将按钮或可编辑字段与下拉列表组合的组件。用户可以从下拉列表中选择值，下拉列表在用户请求时显示。如果使组合框处于可编辑状态，则组合框将包括用户可在其中键入值的可编辑字段。**

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 <th colspan="2"> <h3>嵌套类摘要</h3> </th> 
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 <td style="vertical-align:top;width:178px;"><code>protected &nbsp;class</code></td> 
 <td style="width:670px;"><code><a rel="nofollow">JComboBox.AccessibleJComboBox</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此类实现 <code>JComboBox</code> 类的可访问性支持。</td> 
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 <td style="vertical-align:top;width:178px;"><code>static&nbsp;interface</code></td> 
 <td style="width:670px;"><code><a rel="nofollow">JComboBox.KeySelectionManager</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;定义 <code>KeySelectionManager</code> 的接口。</td> 
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<table> 
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 <th colspan="2"> <h3>字段摘要</h3> </th> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">String</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">actionCommand</a></code> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">ComboBoxModel</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">dataModel</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">ComboBoxEditor</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">editor</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;boolean</code></td> 
 <td style="width:524px;"><code><a rel="nofollow">isEditable</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">JComboBox.KeySelectionManager</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">keySelectionManager</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;boolean</code></td> 
 <td style="width:524px;"><code><a rel="nofollow">lightWeightPopupEnabled</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;int</code></td> 
 <td style="width:524px;"><code><a rel="nofollow">maximumRowCount</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">ListCellRenderer</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">renderer</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;此受保护字段是特定于实现的。</td> 
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 <td style="vertical-align:top;width:324px;"><code>protected &nbsp;<a rel="nofollow">Object</a></code></td> 
 <td style="width:524px;"><code><a rel="nofollow">selectedItemReminder</a></code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 此受保护字段是特定于实现的。</td> 
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 <th colspan="2"> <h3>构造方法摘要</h3> </th> 
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 <td><code><a rel="nofollow">JComboBox</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建具有默认数据模型的 <code>JComboBox</code>。</td> 
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 <td><code><a rel="nofollow">JComboBox</a>(<a rel="nofollow">ComboBoxModel</a>&nbsp;aModel)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建一个 <code>JComboBox</code>，其项取自现有的 <code>ComboBoxModel</code>。</td> 
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 <td><code><a rel="nofollow">JComboBox</a>(<a rel="nofollow">Object</a>[]&nbsp;items)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建包含指定数组中的元素的 <code>JComboBox</code>。</td> 
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 <td><code><a rel="nofollow">JComboBox</a>(<a rel="nofollow">Vector</a>&lt;?&gt;&nbsp;items)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建包含指定 Vector 中的元素的 <code>JComboBox</code>。</td> 
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 <tbody> 
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 <th colspan="2"> <h3>方法摘要</h3> </th> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">actionPerformed</a>(<a rel="nofollow">ActionEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此方法由于实现的副作用而存在的公共方法。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">actionPropertyChanged</a>(<a rel="nofollow">Action</a>&nbsp;action, <a rel="nofollow">String</a>&nbsp;propertyName)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;更新组合框的状态以响应关联动作中的属性更改。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">addActionListener</a>(<a rel="nofollow">ActionListener</a>&nbsp;l)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;添加 <code>ActionListener</code>。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">addItem</a>(<a rel="nofollow">Object</a>&nbsp;anObject)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;为项列表添加项。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">addItemListener</a>(<a rel="nofollow">ItemListener</a>&nbsp;aListener)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;添加 <code>ItemListener</code>。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">addPopupMenuListener</a>(<a rel="nofollow">PopupMenuListener</a>&nbsp;l)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;添加 <code>PopupMenu</code> 侦听器，该侦听器将侦听取自组合框弹出部分的通知消息。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">configureEditor</a>(<a rel="nofollow">ComboBoxEditor</a>&nbsp;anEditor, <a rel="nofollow">Object</a>&nbsp;anItem)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;利用指定项初始化编辑器。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">configurePropertiesFromAction</a>(<a rel="nofollow">Action</a>&nbsp;a)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在此组合框上设置属性以匹配指定 <code>Action</code> 中的属性。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">contentsChanged</a>(<a rel="nofollow">ListDataEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此方法作为实现的副作用存在的公共方法。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;<a rel="nofollow">PropertyChangeListener</a></code></td> 
 <td><code><a rel="nofollow">createActionPropertyChangeListener</a>(<a rel="nofollow">Action</a>&nbsp;a)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;创建并返回一个 <code>PropertyChangeListener</code>，它负责侦听指定 <code>Action</code> 的更改并更新适当属性。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;<a rel="nofollow">JComboBox.KeySelectionManager</a></code></td> 
 <td><code><a rel="nofollow">createDefaultKeySelectionManager</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回默认键选择管理器的实例。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">fireActionEvent</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通知所有需要此事件类型的通知的已注册侦听器。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">fireItemStateChanged</a>(<a rel="nofollow">ItemEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通知所有需要此事件类型的通知的已注册侦听器。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">firePopupMenuCanceled</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通知 <code>PopupMenuListener</code> 组合框的弹出部分已被取消。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">firePopupMenuWillBecomeInvisible</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通知 <code>PopupMenuListener</code> 组合框的弹出部分已变得不可见。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">firePopupMenuWillBecomeVisible</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通知 <code>PopupMenuListener</code> 组合框的弹出部分将变得可见。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">AccessibleContext</a></code></td> 
 <td><code><a rel="nofollow">getAccessibleContext</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;获取与此 JComboBox 关联的 AccessibleContext。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">Action</a></code></td> 
 <td><code><a rel="nofollow">getAction</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回此 <code>ActionEvent</code> 源当前设置的 <code>Action</code>，如果没有设置任何 <code>Action</code>，则返回 <code>null</code>。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">String</a></code></td> 
 <td><code><a rel="nofollow">getActionCommand</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回发送到动作侦听器的事件中包括的动作命令。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ActionListener</a>[]</code></td> 
 <td><code><a rel="nofollow">getActionListeners</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回使用 addActionListener() 添加到此 JComboBox 的所有 <code>ActionListener</code> 组成的数组。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ComboBoxEditor</a></code></td> 
 <td><code><a rel="nofollow">getEditor</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回用于绘制和编辑 <code>JComboBox</code> 字段中所选项的编辑器。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">Object</a></code></td> 
 <td><code><a rel="nofollow">getItemAt</a>(int&nbsp;index)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回指定索引处的列表项。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;int</code></td> 
 <td><code><a rel="nofollow">getItemCount</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回列表中的项数。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ItemListener</a>[]</code></td> 
 <td><code><a rel="nofollow">getItemListeners</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回使用 addItemListener() 添加到此 JComboBox 中的所有 <code>ItemListener</code> 组成的数组。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">JComboBox.KeySelectionManager</a></code></td> 
 <td><code><a rel="nofollow">getKeySelectionManager</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回列表的键选择管理器。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;int</code></td> 
 <td><code><a rel="nofollow">getMaximumRowCount</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回组合框不使用滚动条可以显示的最大项数</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ComboBoxModel</a></code></td> 
 <td><code><a rel="nofollow">getModel</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回 <code>JComboBox</code> 当前使用的数据模型。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">PopupMenuListener</a>[]</code></td> 
 <td><code><a rel="nofollow">getPopupMenuListeners</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回利用 addPopupMenuListener() 添加到此 JComboBox 的所有 <code>PopupMenuListener</code> 组成的数组。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">Object</a></code></td> 
 <td><code><a rel="nofollow">getPrototypeDisplayValue</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回“原型显示”值，即用于计算显示高度和宽度的 Object。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ListCellRenderer</a></code></td> 
 <td><code><a rel="nofollow">getRenderer</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回用于显示 <code>JComboBox</code> 字段中所选项的渲染器。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;int</code></td> 
 <td><code><a rel="nofollow">getSelectedIndex</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回列表中与给定项匹配的第一个选项。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">Object</a></code></td> 
 <td><code><a rel="nofollow">getSelectedItem</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回当前所选项。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">Object</a>[]</code></td> 
 <td><code><a rel="nofollow">getSelectedObjects</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回包含所选项的数组。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">ComboBoxUI</a></code></td> 
 <td><code><a rel="nofollow">getUI</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回呈现此组件的 L&amp;F 对象。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;<a rel="nofollow">String</a></code></td> 
 <td><code><a rel="nofollow">getUIClassID</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回呈现此组件的 L&amp;F 类的名称。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">hidePopup</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;促使组合框关闭其弹出窗口。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">insertItemAt</a>(<a rel="nofollow">Object</a>&nbsp;anObject, int&nbsp;index)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在项列表中的给定索引处插入项。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">installAncestorListener</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">intervalAdded</a>(<a rel="nofollow">ListDataEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此方法作为实现的副作用存在的公共方法。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">intervalRemoved</a>(<a rel="nofollow">ListDataEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此方法作为实现的副作用存在的公共方法。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;boolean</code></td> 
 <td><code><a rel="nofollow">isEditable</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;如果 <code>JComboBox</code> 可编辑，则返回 true。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;boolean</code></td> 
 <td><code><a rel="nofollow">isLightWeightPopupEnabled</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;获取 <code>lightWeightPopupEnabled</code> 属性的值。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;boolean</code></td> 
 <td><code><a rel="nofollow">isPopupVisible</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;确定弹出窗口的可见性。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;<a rel="nofollow">String</a></code></td> 
 <td><code><a rel="nofollow">paramString</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;返回此 <code>JComboBox</code> 的字符串表示形式。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">processKeyEvent</a>(<a rel="nofollow">KeyEvent</a>&nbsp;e)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;处理 <code>KeyEvent</code>，查找 Tab 键。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removeActionListener</a>(<a rel="nofollow">ActionListener</a>&nbsp;l)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;移除 <code>ActionListener</code>。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removeAllItems</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;从项列表中移除所有项。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removeItem</a>(<a rel="nofollow">Object</a>&nbsp;anObject)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;从项列表中移除项。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removeItemAt</a>(int&nbsp;anIndex)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;移除 <code>anIndex</code> 处的项。</td> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removeItemListener</a>(<a rel="nofollow">ItemListener</a>&nbsp;aListener)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;移除 <code>ItemListener</code>。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">removePopupMenuListener</a>(<a rel="nofollow">PopupMenuListener</a>&nbsp;l)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;移除 <code>PopupMenuListener</code>。</td> 
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 <td style="vertical-align:top;"><code>protected &nbsp;void</code></td> 
 <td><code><a rel="nofollow">selectedItemChanged</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;此受保护方法是特定于实现的。</td> 
 </tr> 
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 <td style="vertical-align:top;"><code>&nbsp;boolean</code></td> 
 <td><code><a rel="nofollow">selectWithKeyChar</a>(char&nbsp;keyChar)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;如果存在与指定键盘字符相对应的项，则选择该列表项并返回 true。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setAction</a>(<a rel="nofollow">Action</a>&nbsp;a)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置 <code>ActionEvent</code> 源的 <code>Action</code>。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setActionCommand</a>(<a rel="nofollow">String</a>&nbsp;aCommand)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置发送到动作侦听器的事件中应该包括的动作命令。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setEditable</a>(boolean&nbsp;aFlag)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;确定 <code>JComboBox</code> 字段是否可编辑。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setEditor</a>(<a rel="nofollow">ComboBoxEditor</a>&nbsp;anEditor)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置用于绘制和编辑 <code>JComboBox</code> 字段中所选项的编辑器。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setEnabled</a>(boolean&nbsp;b)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;启用组合框以便可以选择项。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setKeySelectionManager</a>(<a rel="nofollow">JComboBox.KeySelectionManager</a>&nbsp;aManager)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置将键盘字符转换为列表选择的对象。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setLightWeightPopupEnabled</a>(boolean&nbsp;aFlag)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置 <code>lightWeightPopupEnabled</code> 属性，该属性提供一个提示：是应该使用重量级 <code>Component</code>（如 <code>Panel</code> 或 <code>Window</code>）还是轻量级 <code>Component</code> 来包含 <code>JComboBox</code>。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setMaximumRowCount</a>(int&nbsp;count)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置 <code>JComboBox</code> 显示的最大行数。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setModel</a>(<a rel="nofollow">ComboBoxModel</a>&nbsp;aModel)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置 <code>JComboBox</code> 用于获取项列表的数据模型。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setPopupVisible</a>(boolean&nbsp;v)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置弹出窗口的可见性。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setPrototypeDisplayValue</a>(<a rel="nofollow">Object</a>&nbsp;prototypeDisplayValue)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置用于计算 UI 部分的显示大小的原型显示值。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setRenderer</a>(<a rel="nofollow">ListCellRenderer</a>&nbsp;aRenderer)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置渲染器，该渲染器用于绘制列表项和从 JComboBox 字段的列表中选择的项。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setSelectedIndex</a>(int&nbsp;anIndex)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;选择索引 <code>anIndex</code> 处的项。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setSelectedItem</a>(<a rel="nofollow">Object</a>&nbsp;anObject)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;将组合框显示区域中所选项设置为参数中的对象。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">setUI</a>(<a rel="nofollow">ComboBoxUI</a>&nbsp;ui)</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;设置呈现此组件的 L&amp;F 对象。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">showPopup</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;促使组合框显示其弹出窗口。</td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"><code>&nbsp;void</code></td> 
 <td><code><a rel="nofollow">updateUI</a>()</code> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;将 UI 属性重置为当前外观的值。</td> 
 </tr> 
 </tbody> 
</table>