Java javax.swing Class JPanel（JDK8）

Constructor Detail

• JPanel

  public JPanel(LayoutManager layout,
                boolean isDoubleBuffered)

  Creates a new JPanel with the specified layout manager and buffering strategy.

  Parameters:

  layout - the LayoutManager to use

  isDoubleBuffered - a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates

• JPanel

  public JPanel(LayoutManager layout)

  Create a new buffered JPanel with the specified layout manager

  Parameters:

  layout - the LayoutManager to use

• JPanel

  public JPanel(boolean isDoubleBuffered)

  Creates a new JPanel with FlowLayout and the specified buffering strategy. If isDoubleBuffered is true, the JPanel will use a double buffer.

  Parameters:

  isDoubleBuffered - a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates

• JPanel

  public JPanel()

  Creates a new JPanel with a double buffer and a flow layout.

Method Detail

• updateUI

  public void updateUI()

  Resets the UI property with a value from the current look and feel.

  Overrides:

  updateUI in class JComponent

  See Also:

  JComponent.updateUI()

• getUI

  public PanelUI getUI()

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

  Returns:

  the PanelUI object that renders this component

  Since:

  1.4

• setUI

  public void setUI(PanelUI ui)

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

  Parameters:

  ui - the PanelUI L&F object

  Since:

  1.4

  See Also:

  UIDefaults.getUI(javax.swing.JComponent)

• getUIClassID

  public String getUIClassID()

  Returns a string that specifies the name of the L&F class that renders this component.

  Overrides:

  getUIClassID in class JComponent

  Returns:

  "PanelUI"

  See Also:

  JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

• paramString

  protected String paramString()

  Returns a string representation of this JPanel. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

  Overrides:

  paramString in class JComponent

  Returns:

  a string representation of this JPanel.

• getAccessibleContext

  public AccessibleContext getAccessibleContext()

  Gets the AccessibleContext associated with this JPanel. For JPanels, the AccessibleContext takes the form of an AccessibleJPanel. A new AccessibleJPanel instance is created if necessary.

  Specified by:

  getAccessibleContext in interface Accessible

  Overrides:

  getAccessibleContext in class Component

  Returns:

  an AccessibleJPanel that serves as the AccessibleContext of this JPanel