Examples of java.awt.HeadlessException

java.awt.HeadlessException
Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse. @since 1.4 @author Michael Martak

                                       PrintRequestAttributeSet attributes)
        throws HeadlessException
{


    if (GraphicsEnvironment.isHeadless()) { 
        throw new HeadlessException();
    }


    int initialIndex = checkServices(services, defaultService, attributes);


    Window activeWindow = KeyboardFocusManager.getCurrentKeyboardFocusManager()

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        return expandsSelectedPaths;
    }


    public void setDragEnabled(final boolean enabled) {
        if (enabled && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        dragEnabled = enabled;
    }

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                       PrintRequestAttributeSet dialogAttrs, 
                       Window owner) 
{
    if (GraphicsEnvironment.isHeadless()) {
        dialogResult = SETUP_ERROR;
        throw new HeadlessException();
    }


    if (owner instanceof Frame) {
        printDialog = new JDialog((Frame)owner, "Print", true, gc);
    } else if(owner instanceof Dialog) {

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    dialogType = PAGE_DIALOG;


    if (GraphicsEnvironment.isHeadless()) {
        dialogResult = SETUP_ERROR;
        throw new HeadlessException();
    }


    if (owner instanceof Frame) {
        printDialog = new JDialog((Frame)owner, "Print", true, gc);
    } else if (owner instanceof Dialog) {

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     *            returns true
     * @see java.awt.GraphicsEnvironment#isHeadless
     */
    public static DragSource getDefaultDragSource() {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else {
            return dflt;
        }
    }

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     *            returns true
     * @see java.awt.GraphicsEnvironment#isHeadless
     */
    public DragSource() throws HeadlessException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
    }

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    public DropTarget(Component c, int ops, DropTargetListener dtl,
                      boolean act, FlavorMap fm)
        throws HeadlessException
    {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }


        component = c;


        setDefaultActions(ops);

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        throws HeadlessException
    {
        int defaultIndex = -1;


        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else if ((services == null) || (services.length == 0)) {
            throw new IllegalArgumentException("services must be non-null " +
                                               "and non-empty");
        } else if (attributes == null) {
            throw new IllegalArgumentException("attributes must be non-null");

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     *  description: determines whether automatic drag handling is enabled
     *        bound: false
     */
    public void setDragEnabled(boolean b) {
        if (b && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        dragEnabled = b;
    }

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     *  description: determines whether automatic drag handling is enabled
     *        bound: false
     */
    public void setDragEnabled(boolean b) {
        if (b && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
  dragEnabled = b;
    }

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