There are cases where & is displayed directly in some Swing docs, meaning it appears as & in the generated HTML.

There's a funny case in JPanel.java, line 130:

     * Returns the look and feel (L&F) object that renders this component.



But more interesting, there are a number of places in @BeanProperty annotations, where `L&F` is written as `L&F` ... even though the string is a simple Java String, and not appearing in the context of a javadoc comment.

Here's the 'grep' output for `&` in the Swing classes, in a current docs build.

build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JToggleButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/plaf/class-use/PanelUI.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JFileChooser.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="Sets whether the approve &amp;amp; cancel buttons are shown.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JFileChooser.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="The L&amp;amp;F object that renders this component.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="The minimum location of the divider from the L&amp;amp;F.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JCheckBox.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JRadioButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")

But more interesting, there are a number of places in @BeanProperty annotations, where `L&F` is written as `L&amp;F` ... even those the string is a simple Java String, and not appearing in the context of a javadoc comment.

Here's the 'grep' output for `&amp;amp;` in the Swing classes, in a current docs build.

build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JPanel.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JToggleButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/plaf/class-use/PanelUI.html:<div class="block">Returns the look and feel (L&amp;amp;F) object that renders this component.</div>
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JFileChooser.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="Sets whether the approve &amp;amp; cancel buttons are shown.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JFileChooser.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="The L&amp;amp;F object that renders this component.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JSplitPane.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="The minimum location of the divider from the L&amp;amp;F.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JCheckBox.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class")
build/linux-x86_64-normal-server-release/images/docs/api/java.desktop/javax/swing/JRadioButton.html: <a href="../../java/beans/BeanProperty.html#description()">description</a>="A string that specifies the name of the L&amp;amp;F class.")