[Chapter 18] 18.60 java.awt.Toolkit (JDK 1.0)

#

| Chapter 18 The java.awt Package |

## 18.60 java.awt.Toolkit (JDK 1.0)

###

This abstract class defines methods that, when implemented, create platform-dependent "peers" for each of the `java.awt` `Component` types. Java supports its platform-independent GUI interface by implementing a subclass of `Toolkit` for each platform. Portable programs should never use these methods to create peers directly--they should use the `Component` classes themselves. A `Toolkit` object cannot be instantiated directly. `Component.getToolkit()` returns the `Toolkit` being used for a particular component.

The `Toolkit` class defines a few methods that you can use directly: the static method `getDefaultToolkit()` returns the default `Toolkit` that is in use. `getScreenSize()` returns the screen size in pixels, and `getScreenResolution()` returns the resolution in dots-per-inch. `getFontList()` returns the names of supported fonts. `sync()` flushes all pending graphics output, which can be useful for animation. In Java 1.1, `getPrintJob()`, `getSystemClipboard()`, and `getSystemEventQueue()` are also of interest.

    public abstract class Toolkit extends Object {
        // Default Constructor: public Toolkit()
        // Class Methods
                public static synchronized Toolkit getDefaultToolkit();
            1.1  protected static Container getNativeContainer(Component c);
            1.1  public static String getProperty(String key, String defaultValue);
        // Public Instance Methods
            1.1  public abstract void beep();
                public abstract int checkImage(Image image, int width, int height, ImageObserver observer);
                public abstract Image createImage(ImageProducer producer);
            1.1  public Image createImage(byte[] imagedata);
            1.1  public abstract Image createImage(byte[] imagedata, int imageoffset, int imagelength);
                public abstract ColorModel getColorModel();
                public abstract String[] getFontList();
                public abstract FontMetrics getFontMetrics(Font font);
                public abstract Image getImage(String filename);
                public abstract Image getImage(URL url);
            1.1  public int getMenuShortcutKeyMask();
            1.1  public abstract PrintJob getPrintJob(Frame frame, String jobtitle, Properties props);
                public abstract int getScreenResolution();
                public abstract Dimension getScreenSize();
            1.1  public abstract Clipboard getSystemClipboard();
            1.1  public final EventQueue getSystemEventQueue();
                public abstract boolean prepareImage(Image image, int width, int height, ImageObserver observer);
                public abstract void sync();
        // Protected Instance Methods
                protected abstract ButtonPeer createButton(Button target);
                protected abstract CanvasPeer createCanvas(Canvas target);
                protected abstract CheckboxPeer createCheckbox(Checkbox target);
                protected abstract CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target);
                protected abstract ChoicePeer createChoice(Choice target);
            1.1  protected LightweightPeer createComponent(Component target);
                protected abstract DialogPeer createDialog(Dialog target);
                protected abstract FileDialogPeer createFileDialog(FileDialog target);
                protected abstract FramePeer createFrame(Frame target);
                protected abstract LabelPeer createLabel(Label target);
                protected abstract ListPeer createList(List target);
                protected abstract MenuPeer createMenu(Menu target);
                protected abstract MenuBarPeer createMenuBar(MenuBar target);
                protected abstract MenuItemPeer createMenuItem(MenuItem target);
                protected abstract PanelPeer createPanel(Panel target);
            1.1  protected abstract PopupMenuPeer createPopupMenu(PopupMenu target);
            1.1  protected abstract ScrollPanePeer createScrollPane(ScrollPane target);
                protected abstract ScrollbarPeer createScrollbar(Scrollbar target);
                protected abstract TextAreaPeer createTextArea(TextArea target);
                protected abstract TextFieldPeer createTextField(TextField target);
                protected abstract WindowPeer createWindow(Window target);
            1.1  protected abstract FontPeer getFontPeer(String name, int style);
            1.1  protected abstract EventQueue getSystemEventQueueImpl();
            1.1  protected void loadSystemColors(int[] systemColors);
    }

### Returned By:

`Component.getToolkit(), ComponentPeer.getToolkit(), Toolkit.getDefaultToolkit(), Window.getToolkit()`

java.awt.TextField (JDK 1.0) |  | java.awt.Window (JDK 1.0)