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Java JComponent

The JComponent class is the base class of all Swing components except top-level containers. Swing components whose names begin with "J" are descendants of the JComponent class. For example, JButton, JScrollPane, JPanel, JTable etc. But, JFrame and JDialog don't inherit JComponent class because they are the child of top-level containers.

The JComponent class extends the Container class which itself extends Component. The Container class has support for adding components to the container.

Fields

Modifier and Type Field Description
protected AccessibleContext accessibleContext The AccessibleContext associated with this JComponent.
protectedEventListenerList listenerList A list of event listeners for this component.
static String TOOL_TIP_TEXT_KEY The comment to display when the cursor is over the component, also known as a "value tip", "flyover help", or "flyover label"
protected ComponentUI ui The look and feel delegate for this component.
static int UNDEFINED_CONDITION It is a constant used by some of the APIs to mean that no condition is defined.
static int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT It is a constant used for registerKeyboardAction that means that the command should be invoked when the receiving component is an ancestor of the focused component or is itself the focused component.
static int WHEN_FOCUSED It is a constant used for registerKeyboardAction that means that the command should be invoked when the component has the focus.
static int WHEN_IN_FOCUSED_WINDOW Constant used for registerKeyboardAction that means that the command should be invoked when the receiving component is in the window that has the focus or is itself the focused component.

Constructor

Constructor Description
JComponent() Default JComponent constructor.

Useful Methods

Modifier and Type Method Description
void setActionMap(ActionMap am) It sets the ActionMap to am.
void setBackground(Color bg) It sets the background color of this component.
void setFont(Font font) It sets the font for this component.
void setMaximumSize(Dimension maximumSize) It sets the maximum size of this component to a constant value.
void setMinimumSize(Dimension minimumSize) It sets the minimum size of this component to a constant value.
protected void setUI(ComponentUI newUI) It sets the look and feel delegate for this component.
void setVisible(boolean aFlag) It makes the component visible or invisible.
void setForeground(Color fg) It sets the foreground color of this component.
String getToolTipText(MouseEvent event) It returns the string to be used as the tooltip for event.
Container getTopLevelAncestor() It returns the top-level ancestor of this component (either the containing Window or Applet), or null if this component has not been added to any container.
TransferHandler getTransferHandler() It gets the transferHandler property.

Java JComponent Example

Output:

Java Jcomponent
Next TopicJava JLayeredPane




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Java JComponent
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