javax.swing

Class JPanel

public class JPanel extends JComponent implements Accessible

An instance of JPanel can be added to a panel, frame etc

Nested Class Summary
protected class	JPanel.AccessibleJPanel Provides accessibility support for `JPanel`.

Constructor Summary
	JPanel() Creates a new panel with a new instance of {@link FlowLayout} as the layout manager and double-buffering enabled.
	JPanel(boolean isDoubleBuffered) Creates a new panel with double-buffering enabled or disabled as specified.
	JPanel(LayoutManager layout) Creates a new panel with the specified layout manager.
	JPanel(LayoutManager layout, boolean isDoubleBuffered) Creates a new panel with the specified layout manager and double-buffering.

Method Summary
AccessibleContext	getAccessibleContext() Returns the object that provides accessibility features for this `JPanel` component.
PanelUI	getUI() Returns the UI delegate for the `JPanel` component.
String	getUIClassID() Returns the suffix (`"PanelUI"` in this case) used to determine the class name for a UI delegate that can provide the look and feel for a `JPanel`.
protected String	paramString() Returns an implementation-dependent string describing the attributes of this `JPanel`.
void	setUI(PanelUI ui) Sets the UI delegate for the `JPanel` component.
void	updateUI() Sets this panel's UI delegate to the default (obtained from the {@link UIManager}) for the current look and feel.

Constructor Detail

public JPanel()

Creates a new panel with a new instance of {@link FlowLayout} as the layout manager and double-buffering enabled.

public JPanel(boolean isDoubleBuffered)

Creates a new panel with double-buffering enabled or disabled as specified. The default layout manager is an instance of {@link FlowLayout}.

Parameters: isDoubleBuffered a flag that controls whether or not double-buffering is enabled.

public JPanel(LayoutManager layout)

Creates a new panel with the specified layout manager. Double-buffering is enabled by default.

Parameters: layout the layout manager (null permitted).

public JPanel(LayoutManager layout, boolean isDoubleBuffered)

Creates a new panel with the specified layout manager and double-buffering.

Parameters: layout the layout manager (null permitted). isDoubleBuffered a flag that controls whether or not double-buffering is enabled.

public AccessibleContext getAccessibleContext()

Returns the object that provides accessibility features for this JPanel component.

Returns: The accessible context (an instance of {@link AccessibleJPanel}).

public PanelUI getUI()

Returns the UI delegate for the JPanel component.

Returns: The UI delegate.

Since: 1.4

public String getUIClassID()

Returns the suffix ("PanelUI" in this case) used to determine the class name for a UI delegate that can provide the look and feel for a JPanel.

Returns: "PanelUI".

protected String paramString()

Returns an implementation-dependent string describing the attributes of this JPanel.

Returns: A string describing the attributes of this JPanel (never null).

public void setUI(PanelUI ui)

Sets the UI delegate for the JPanel component.

Parameters: ui the UI delegate.

Since: 1.4

public void updateUI()

Sets this panel's UI delegate to the default (obtained from the {@link UIManager}) for the current look and feel.