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所有已知实现类：
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AbstractColorChooserPanel,
Applet,
BasicArrowButton,
BasicComboBoxRenderer,
BasicComboBoxRenderer.UIResource,
BasicComboPopup,
BasicInternalFrameTitlePane.SystemMenuBar,
BasicToolBarUI.DragWindow,
Box,
Box.Filler,
Button,
Canvas,
CellRendererPane,
Checkbox,
CheckboxMenuItem,
Choice,
DefaultListCellRenderer,
DefaultListCellRenderer.UIResource,
DefaultTableCellRenderer,
DefaultTableCellRenderer.UIResource,
DefaultTreeCellEditor.DefaultTextField,
DefaultTreeCellRenderer,
Dialog,
FileDialog,
Frame,
HTMLEditorKit,
ImageIcon,
JApplet,
JButton,
JCheckBox,
JCheckBoxMenuItem,
JColorChooser,
JComboBox,
JDesktopPane,
JDialog,
JEditorPane,
JFileChooser,
JFormattedTextField,
JFrame,
JInternalFrame,
JInternalFrame.JDesktopIcon,
JLabel,
JLayeredPane,
JList,
JList.AccessibleJList.AccessibleJListChild,
JMenu,
JMenuBar,
JMenuItem,
JOptionPane,
JPanel,
JPasswordField,
JPopupMenu,
JPopupMenu.Separator,
JProgressBar,
JRadioButton,
JRadioButtonMenuItem,
JRootPane,
JScrollBar,
JScrollPane,
JScrollPane.ScrollBar,
JSeparator,
JSlider,
JSpinner,
JSpinner.DateEditor,
JSpinner.DefaultEditor,
JSpinner.ListEditor,
JSpinner.NumberEditor,
JSplitPane,
JTabbedPane,
JTable,
JTable.AccessibleJTable.AccessibleJTableCell,
JTableHeader,
JTableHeader.AccessibleJTableHeader.AccessibleJTableHeaderEntry,
JTextArea,
JTextComponent,
JTextField,
JTextPane,
JToggleButton,
JToolBar,
JToolBar.Separator,
JToolTip,
JTree,
JTree.AccessibleJTree.AccessibleJTreeNode,
JViewport,
JWindow,
Label,
List,
List.AccessibleAWTList.AccessibleAWTListChild,
Menu,
MenuBar,
MenuItem,
MetalComboBoxButton,
MetalComboBoxUI.MetalComboPopup,
MetalFileChooserUI.FileRenderer,
MetalFileChooserUI.FilterComboBoxRenderer,
MetalScrollButton,
Panel,
PopupMenu,
ProgressMonitor,
Scrollbar,
ScrollPane,
TextArea,
TextComponent,
TextField,
Window
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public interface Accessible
Accessible 接口是可访问性包的主接口。所有支持可访问性包的组件都必须实现此接口。它包含单个方法 getAccessibleContext()，此方法返回 AccessibleContext 类的实例。
getAccessibleContext
AccessibleContext getAccessibleContext()
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返回与此对象关联的 AccessibleContext。在大多数情况下，如果对象实现了 Accessible 接口，则返回值不应为 null。如果组件开发人员创建了实现 Accessible 的对象的子类，且该子类不是 Accessible，那么开发人员应该重写 getAccessibleContext 方法以返回 null。
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