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

            bfPanel.setAlignmentY(Component.CENTER_ALIGNMENT); // BOTTOM
            tabs.addTab("Layer Visibility", bfPanel);


            for (int i = 0; i < layerComps.length; i++) {
                Layer layer = (Layer) layerComps[i];
                Component layerGUI = layer.getGUI();
                if (layerGUI != null) {
                    tabs.addTab(layer.getName(), layerGUI);
                }


                VisHelper layerVisibility = new VisHelper(layer);

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     * Stores the source view in the entry editor, if one is open, has the source view
     * selected and the source has been edited.
     * @return boolean false if there is a validation error in the source panel, true otherwise.
     */
    public boolean entryEditorAllowsChange() {
      Component c = splitPane.getBottomComponent();
      if ((c != null) && (c instanceof EntryEditor)) {
        return ((EntryEditor)c).lastSourceAccepted();
      }
      else
        return true;

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      else
        return true;
    }


    public void moveFocusToEntryEditor() {
      Component c = splitPane.getBottomComponent();
      if ((c != null) && (c instanceof EntryEditor)) {
        new FocusRequester(c);
      }
    }

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    }else{
      String subMenu = subMenus[0];
      String suffix = action.substring(subMenu.length()+1);


      // Search in currentMenu components, if the subMenu does exist already
      Component c[] =  currentMenu.getComponents();
      for (int i=0; i<c.length; ++i) {
        if ((c[i] instanceof JMenu) && ((JMenu)c[i]).getText().equals(subMenu)){
          return createMenuItem(((JMenu)c[i]), suffix, icon);
        }
      }

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  /** Adds a menu entry in the tools menu */
  
  public void setMenu(JMenuBar mb) {
    Component c[] = mb.getComponents();
    JMenu jm =null;
    boolean found=false;
    
    for (int i=0; i<c.length; ++i) {
      jm = (JMenu)c[i];

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    }


    class SourceCellRenderer extends DefaultTreeCellRenderer {
        public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
                boolean leaf, int row, boolean hasFocus) {
            Component c = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
            if (value == null) {
                return c;
            }
            if (value instanceof SourceNode) {
                Object o = ((SourceNode) value).getUserObject();
                if (o instanceof ExpressionDataSource) {
                    setText(DataInfo.toString(o) + " = " + DataInfo.getComment(o));
                }
                Icon icon = (Icon) dataSourceIcons.get(o.getClass());
                if (icon != null) {
                    setIcon(icon);
                } else {
                    Class parent = o.getClass().getSuperclass();
                    if (parent != null) {
                        icon = (Icon) dataSourceIcons.get(parent);
                        if (icon != null) {
                            setIcon(icon);
                        }
                    }
                }
                if (((SourceNode) value).isLocked()) {
                    c.setForeground(SystemColor.controlDkShadow);
                }
            }
            return c;
        }

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        // remove the tabPane
        tabPane = null;
        removeAll();
        if(firstSplitBorder!=null){
          Element ef=getElement(firstSplitBorder.comp);
          Component c=ef.owner;
          if(tabSplit==c){
            add(ef.border);
            ef.owner=ef.border;
          }
          else{
            add(c);
          }
        }
        tabSplit = null;
      }
    } else if (e.owner == e.border) {
      removeAll();
      firstSplitBorder=null;
    } else if (e.owner instanceof JSplitPane) {
      JSplitPane sp = (JSplitPane) e.owner;
      if ((sp.getLeftComponent() instanceof SplitBorder)
          && ((SplitBorder) (sp.getLeftComponent())).comp == e.comp) {
        Component r=sp.getRightComponent();
        if(sp.getParent() instanceof JSplitPane){
          JSplitPane previous = (JSplitPane)sp.getParent();
          sp.removeAll();
          previous.setRightComponent(r);
          if(r instanceof SplitBorder){
            SplitBorder b=(SplitBorder)r;
            Element eb=(Element)getElement(b.comp);
            if(previous.getLeftComponent()==tabPane){
              firstSplitBorder=b;
            }
            eb.owner=previous;
          }
          else if(r instanceof JSplitPane){
          }
          else {
            throw new RuntimeException(
                "SplitTabPane unexpected state : right component = "+r);
          }
        }
        else if(sp.getParent()==this){
          sp.removeAll();
          removeAll();
          add(r);
          if(r instanceof SplitBorder){
            SplitBorder b=(SplitBorder)r;
            Element eb=(Element)getElement(b.comp);
            eb.owner=b;
            firstSplitBorder=b;
          }
          else if(r instanceof JSplitPane){
            firstSplitBorder=(SplitBorder)((JSplitPane)r).getLeftComponent();
          }
          else {
            throw new RuntimeException(
                "SplitTabPane unexpected state : right component = "+r);
          }
        }
        else{
          throw new RuntimeException(
          "SplitTabPane unexpected state : root split is not owned by this");
        }
      } else if ((sp.getRightComponent() instanceof SplitBorder)
          && ((SplitBorder) (sp.getRightComponent())).comp == e.comp) {
        Component left = sp.getLeftComponent();
        if (left instanceof JSplitPane) {
          throw new RuntimeException(
              "SplitTabPane unexpected state : left element is a split");
        } else {
          if (left == tabPane) {

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        // Get width of column header
        TableCellRenderer renderer = col.getHeaderRenderer();
        if (renderer == null) {
            renderer = table.getTableHeader().getDefaultRenderer();
        }
        Component comp = renderer.getTableCellRendererComponent(
            table, col.getHeaderValue(), false, false, 0, 0);
        width = comp.getPreferredSize().width;
    
        // Get maximum width of column data
        for (int r=0; r<table.getRowCount(); r++) {
            renderer = table.getCellRenderer(r, vColIndex);
            comp = renderer.getTableCellRendererComponent(
                table, table.getValueAt(r, vColIndex), false, false, r, vColIndex);
            width = Math.max(width, comp.getPreferredSize().width);
        }
    
        // Add margin
        width += 2*margin;

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         */
        public void layoutContainer(Container target) {
            if (target.getComponentCount() == 0) {
                return;
            }
            Component c = target.getComponent(0);
            Dimension d = target.getSize();
            c.setSize(d.width, d.height);
            c.setLocation(0, 0);
        }

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  /** Adds a menu entry in the tools menu */
  public void setMenu(JMenuBar mb) {
    Component c[] = mb.getComponents();
    for (int i=0; i<c.length; ++i) {
      JMenu jm = (JMenu)c[i];
      if (jm.getText().equals(JSynopticPanels.resources.getString("toolsMenu"))) {
        jmi = new JMenuItem(resources.getString("LookAndFeel..."));
        jm.add(jmi);

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