JDK: 1.4+
Platform: all
Class: java.awt.Toolkit
methods:
    http://download.java.net/jdk7/docs/api/java/awt/Toolkit.html#isDynamicLayoutSet%28%29
    http://download.java.net/jdk7/docs/api/java/awt/Toolkit.html#setDynamicLayout%28boolean%29

The foillowing method contains assertion:

protected boolean isDynamicLayoutSet() throws HeadlessException

  ... Note: this method returns the value that was set programmatically; ...


This is not true for default implementation. Please see the following code sample:

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import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.InvalidDnDOperationException;
import java.awt.dnd.peer.DragSourceContextPeer;
import java.awt.font.TextAttribute;
import java.awt.im.InputMethodHighlight;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.peer.*;
import java.net.URL;
import java.util.Map;
import java.util.Properties;

public class DynLayout_default {

    public static void main(String[] args) {
        MyToolkit myToolkit = new MyToolkit();
        System.out.println("setting setDynamicLayout(false)");
        myToolkit.setDynamicLayout(false);
        System.out.println("myToolkit.isDynamicLayoutSet() = " + myToolkit.isDynamicLayoutSet());
    }

    static class MyToolkit extends Toolkit {
        @Override
        protected boolean isDynamicLayoutSet() throws HeadlessException {
            return super.isDynamicLayoutSet();
        }

        @Override
        protected DesktopPeer createDesktopPeer(Desktop target) throws HeadlessException {
            return null;
        }

        @Override
        protected ButtonPeer createButton(Button target) throws HeadlessException {
            return null;
        }

        @Override
        protected TextFieldPeer createTextField(TextField target) throws HeadlessException {
            return null;
        }

        @Override
        protected LabelPeer createLabel(Label target) throws HeadlessException {
            return null;
        }

        @Override
        protected ListPeer createList(List target) throws HeadlessException {
            return null;
        }

        @Override
        protected CheckboxPeer createCheckbox(Checkbox target) throws HeadlessException {
            return null;
        }

        @Override
        protected ScrollbarPeer createScrollbar(Scrollbar target) throws HeadlessException {
            return null;
        }

        @Override
        protected ScrollPanePeer createScrollPane(ScrollPane target) throws HeadlessException {
            return null;
        }

        @Override
        protected TextAreaPeer createTextArea(TextArea target) throws HeadlessException {
            return null;
        }

        @Override
        protected ChoicePeer createChoice(Choice target) throws HeadlessException {
            return null;
        }

        @Override
        protected FramePeer createFrame(Frame target) throws HeadlessException {
            return null;
        }

        @Override
        protected CanvasPeer createCanvas(Canvas target) {
            return null;
        }

        @Override
        protected PanelPeer createPanel(Panel target) {
            return null;
        }

        @Override
        protected WindowPeer createWindow(Window target) throws HeadlessException {
            return null;
        }

        @Override
        protected DialogPeer createDialog(Dialog target) throws HeadlessException {
            return null;
        }

        @Override
        protected MenuBarPeer createMenuBar(MenuBar target) throws HeadlessException {
            return null;
        }

        @Override
        protected MenuPeer createMenu(Menu target) throws HeadlessException {
            return null;
        }

        @Override
        protected PopupMenuPeer createPopupMenu(PopupMenu target) throws HeadlessException {
            return null;
        }

        @Override
        protected MenuItemPeer createMenuItem(MenuItem target) throws HeadlessException {
            return null;
        }

        @Override
        protected FileDialogPeer createFileDialog(FileDialog target) throws HeadlessException {
            return null;
        }

        @Override
        protected CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target) throws HeadlessException {
            return null;
        }

        @Override
        protected FontPeer getFontPeer(String name, int style) {
            return null;
        }

        @Override
        public Dimension getScreenSize() throws HeadlessException {
            return null;
        }

        @Override
        public int getScreenResolution() throws HeadlessException {
            return 0;
        }

        @Override
        public ColorModel getColorModel() throws HeadlessException {
            return null;
        }

        @Override
        public String[] getFontList() {
            return new String[0];
        }

        @Override
        public FontMetrics getFontMetrics(Font font) {
            return null;
        }

        @Override
        public void sync() {

        }

        @Override
        public Image getImage(String filename) {
            return null;
        }

        @Override
        public Image getImage(URL url) {
            return null;
        }

        @Override
        public Image createImage(String filename) {
            return null;
        }

        @Override
        public Image createImage(URL url) {
            return null;
        }

        @Override
        public boolean prepareImage(Image image, int width, int height, ImageObserver observer) {
            return false;
        }

        @Override
        public int checkImage(Image image, int width, int height, ImageObserver observer) {
            return 0;
        }

        @Override
        public Image createImage(ImageProducer producer) {
            return null;
        }

        @Override
        public Image createImage(byte[] imagedata, int imageoffset, int imagelength) {
            return null;
        }

        @Override
        public PrintJob getPrintJob(Frame frame, String jobtitle, Properties props) {
            return null;
        }

        @Override
        public void beep() {

        }

        @Override
        public Clipboard getSystemClipboard() throws HeadlessException {
            return null;
        }

        @Override
        protected EventQueue getSystemEventQueueImpl() {
            return null;
        }

        @Override
        public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
            return null;
        }

        @Override
        public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
            return false;
        }

        @Override
        public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType) {
            return false;
        }

        @Override
        public Map<TextAttribute, ?> mapInputMethodHighlight(InputMethodHighlight highlight) throws HeadlessException {
            return null;
        }
    }

}


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The output will be:

setting setDynamicLayout(false)
myToolkit.isDynamicLayoutSet() = true