Examples of java.awt.Component

java.awt.Component
, now aButton has a listener with a reference // to bigOne! aButton.addActionListener(this); } public void actionPerformed(ActionEvent e) { System.out.println("Hello There"); } } In this example, serializing aButton by itself will cause MyApp and everything it refers to to be serialized as well. The problem is that the listener is serializable by coincidence, not by design. To separate the decisions about MyApp and the ActionListener being serializable one can use a nested class, as in the following example:
```
 import java.awt.*; import java.awt.event.*; import java.io.Serializable; class MyApp java.io.Serializable { BigObjectThatShouldNotBeSerializedWithAButton bigOne; Button aButton = new Button(); static class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { System.out.println("Hello There"); } } MyApp() { aButton.addActionListener(new MyActionListener()); } } 
```
Note: For more information on the paint mechanisms utilitized by AWT and Swing, including information on how to write the most efficient painting code, see Painting in AWT and Swing.
For details on the focus subsystem, see How to Use the Focus Subsystem, a section in The Java Tutorial, and the Focus Specification for more information. @version 1.451, 07/29/09 @author Arthur van Hoff @author Sami Shaio


    JPopupMenu popup = getChooseClassPopupMenu();


    // show the popup where the source component is
    if (e.getSource() instanceof Component) {
      Component comp = (Component) e.getSource();
      popup.show(comp, comp.getX(), comp.getY());
      popup.pack();
      popup.repaint();
    }
  }
      });

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    m_ElementEditor = null; m_ListModel = null;
    removeAll();
    if ((o != null) && (o.getClass().isArray())) {
      Class elementClass = o.getClass().getComponentType();    
      PropertyEditor editor = PropertyEditorManager.findEditor(elementClass);
      Component view = null;
      ListCellRenderer lcr = new DefaultListCellRenderer();
      if (editor != null) {
  if (editor instanceof GenericObjectEditor) {
    ((GenericObjectEditor) editor).setClassType(elementClass);
  }

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    instanceof PropertyVetoException) {
              String message = "WARNING: Vetoed; reason is: " 
                               + ex.getTargetException().getMessage();
        System.err.println(message);
              
              Component jf;
              if(evt.getSource() instanceof JPanel)
                  jf = ((JPanel)evt.getSource()).getParent();
              else
                  jf = new JFrame();
              JOptionPane.showMessageDialog(jf, message, 
                                            "error", 
                                            JOptionPane.WARNING_MESSAGE);
              if(jf instanceof JFrame)
                  ((JFrame)jf).dispose();


            } else {
        System.err.println(ex.getTargetException().getClass().getName()+ 
         " while updating "+ property.getName() +": "+
         ex.getTargetException().getMessage());
              Component jf;
              if(evt.getSource() instanceof JPanel)
                  jf = ((JPanel)evt.getSource()).getParent();
              else
                  jf = new JFrame();
              JOptionPane.showMessageDialog(jf,

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    }
  }


  private boolean containsProgram(final JMenu menu, ProgramMenuItem pItem) {
    for (int i = 0; i < menu.getMenuComponentCount(); i++) {
      Component comp = menu.getMenuComponent(i);
      if (comp instanceof ProgramMenuItem) {
        ProgramMenuItem oldItem = (ProgramMenuItem) comp;
        if (oldItem.getProgram().equals(pItem.getProgram())) {
          return true;
        }

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        return getValueAt(0, column).getClass();
      }


      public Component prepareRenderer(TableCellRenderer renderer, 
          int row, int column) {
        Component c = super.prepareRenderer(renderer, row, column);
        if (!c.getBackground().equals(getSelectionBackground()))
        {
          String type = (String)getModel().getValueAt(row, 3);
          Color backgroundIndicator = null;
          if (type.startsWith("ERROR")) {
            backgroundIndicator = Color.RED;
          } else if (type.startsWith("WARNING")) {
            backgroundIndicator = Color.YELLOW;
          } else if (type.startsWith("INTERRUPTED")) {
            backgroundIndicator = Color.MAGENTA;
          }
          c.setBackground(backgroundIndicator);
        }
        return c;
      }
    };

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  /**
   * Displays this panel in a modal dialog box. 
   */
  public void displayView(View parentView) {
    final Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
    if (SwingTools.showConfirmDialog((JComponent)parentView, 
            this, this.dialogTitle, this.nameTextField) == JOptionPane.OK_OPTION) {
      if (this.controller.getBackFaceShown() != null
          && this.controller.getBackFaceShown()) {
        JRootPane rootPane = SwingUtilities.getRootPane((JComponent)parentView);
        Cursor defaultCursor = rootPane.getCursor();
        try {
          rootPane.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
          this.controller.setModel(ImportFurnitureTaskPanel.copyToTemporaryOBJContent(
              this.iconComponent.getModel(), this.controller.getModel()));
        } catch (IOException e) {
          JOptionPane.showMessageDialog(rootPane, 
              preferences.getLocalizedString(FurniturePanel.class, "backFaceShownError"),
              preferences.getLocalizedString(FurniturePanel.class, "errorTitle"),
              JOptionPane.ERROR_MESSAGE);
        } finally {
          rootPane.setCursor(defaultCursor);
        }
      }
      this.controller.modifyFurniture();
    }
    if (focusOwner != null) {
      focusOwner.requestFocusInWindow();
    }
  }

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    mAction.putValue(Action.NAME,"<html>" + a.getValue(Action.NAME)+ "</html>");
    mAction.putValue(Action.ACTION_COMMAND_KEY,a.getValue(Action.ACTION_COMMAND_KEY));
    mAction.putValue(Action.SMALL_ICON,a.getValue(Action.SMALL_ICON));


    Component c;


    if(ContextMenuSeparatorAction.getInstance().equals(menu.getAction())) {
      parent.add(Box.createRigidArea(new Dimension(0,2)));
      c = parent.add(new JSeparator());
      parent.add(Box.createRigidArea(new Dimension(0,2)));

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        if (image instanceof BufferedImage) {
            return (BufferedImage)image;


        } else {
            @SuppressWarnings("serial")
      MediaTracker tracker = new MediaTracker(new Component(){}); // not sure if this is the right thing to do.
            tracker.addImage(image, 0);
            try {
                tracker.waitForAll();
            } catch (InterruptedException e) {
                throw new IOException(e.getMessage());

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        setBorderPainted(false);
        //Making nice rollover effect
        //we use the same listener for all buttons
        addMouseListener(new MouseAdapter() {
          public void mouseEntered(MouseEvent e) {
            Component component = e.getComponent();


            if (component instanceof AbstractButton) {
              AbstractButton button = (AbstractButton) component;
              button.setBorderPainted(true);
            }
          }


          public void mouseExited(MouseEvent e) {
            Component component = e.getComponent();
            if (component instanceof AbstractButton) {
              AbstractButton button = (AbstractButton) component;
              button.setBorderPainted(false);
            }
          }

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      enableItems(menubar);
    }
    
    public void actionPerformed(ActionEvent e) {
      Object src = e.getSource();
      Component c = tabbedPane.getSelectedComponent();
      if (c instanceof JScrollPane) {
        c = ((JScrollPane) c).getViewport().getView();
      }
      if (!(c instanceof TabInterface)) return;
      TabInterface tab = (TabInterface) c;

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