import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
/**
 * Construct a Robot object that operates on the default screen.
 *
 * @exception AWTException if GraphicsEnvironment.isHeadless()
 * returns true or if the X server does not support the XTest
 * extension
 * @exception SecurityException if createRobot permission is not
 * granted
 */
public Robot () throws AWTException
{
  if (GraphicsEnvironment.isHeadless ())
    throw new AWTException ("Robot: headless graphics environment");

  SecurityManager sm = System.getSecurityManager ();
  if (sm != null)
    sm.checkPermission (new AWTPermission ("createRobot"));

  ClasspathToolkit tk = (ClasspathToolkit) Toolkit.getDefaultToolkit ();

  // createRobot will throw AWTException if XTest is not supported.
  peer = tk.createRobot (GraphicsEnvironment.getLocalGraphicsEnvironment ()
                         .getDefaultScreenDevice ());
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
private IIORegistry()
{
  super(defaultCategories.iterator());

  // XXX: Register built-in Spis here.
  registerServiceProvider(new PNGImageReaderSpi()); // Register PNG decoder.
  registerServiceProvider(new GIFImageReaderSpi()); // Register GIF decoder.
  registerServiceProvider(new BMPImageReaderSpi());
  registerServiceProvider(new BMPImageWriterSpi());

  Toolkit toolkit = Toolkit.getDefaultToolkit();
  if (toolkit instanceof ClasspathToolkit)
    ((ClasspathToolkit)toolkit).registerImageIOSpis(this);

  registerApplicationClasspathSpis();
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
public void setFont(Font f)
{
  // Sun's JDK does not throw NPEs, instead it leaves the current setting
  // unchanged. So do we.
  if (f == null)
    return;

  if (f.getPeer() instanceof GdkFontPeer)
    font = f;
  else
    font =
      ((ClasspathToolkit)(Toolkit.getDefaultToolkit()))
      .getFont(f.getName(), f.getAttributes());

  GdkFontPeer fontpeer = (GdkFontPeer) getFont().getPeer();
  synchronized (fontpeer)
    {
      cairoSetFont(nativePointer, fontpeer);
    }
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
/**
 * Construct a Robot object that operates on the default screen.
 *
 * @exception AWTException if GraphicsEnvironment.isHeadless()
 * returns true or if the X server does not support the XTest
 * extension
 * @exception SecurityException if createRobot permission is not
 * granted
 */
public Robot () throws AWTException
{
  if (GraphicsEnvironment.isHeadless ())
    throw new AWTException ("Robot: headless graphics environment");

  SecurityManager sm = System.getSecurityManager ();
  if (sm != null)
    sm.checkPermission (new AWTPermission ("createRobot"));

  ClasspathToolkit tk = (ClasspathToolkit) Toolkit.getDefaultToolkit ();

  // createRobot will throw AWTException if XTest is not supported.
  peer = tk.createRobot (GraphicsEnvironment.getLocalGraphicsEnvironment ()
	   .getDefaultScreenDevice ());
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
private IIORegistry()
{
  super(defaultCategories.iterator());

  // XXX: Register built-in Spis here.
  registerServiceProvider(new PNGImageReaderSpi()); // Register PNG decoder.
  registerServiceProvider(new GIFImageReaderSpi()); // Register GIF decoder.
  registerServiceProvider(new BMPImageReaderSpi());
  registerServiceProvider(new BMPImageWriterSpi());

  Toolkit toolkit = Toolkit.getDefaultToolkit();
  if (toolkit instanceof ClasspathToolkit)
    ((ClasspathToolkit)toolkit).registerImageIOSpis(this);
  
  registerApplicationClasspathSpis();
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
public void setFont(Font f)
{
  // Sun's JDK does not throw NPEs, instead it leaves the current setting
  // unchanged. So do we.
  if (f == null)
    return;

  if (f.getPeer() instanceof GdkFontPeer)
    font = f;
  else
    font = 
      ((ClasspathToolkit)(Toolkit.getDefaultToolkit()))
      .getFont(f.getName(), f.getAttributes());    
  
  GdkFontPeer fontpeer = (GdkFontPeer) getFont().getPeer();
  synchronized (fontpeer)
    {
      cairoSetFont(nativePointer, fontpeer);
    }
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
public void setFont(Font f)
{
  // Sun's JDK does not throw NPEs, instead it leaves the current setting
  // unchanged. So do we.
  if (f == null)
    return;

  if (f.getPeer() instanceof FreetypeFontPeer)
    font = f;
  else
    font =
      ((ClasspathToolkit)(Toolkit.getDefaultToolkit()))
      .getFont(f.getName(), f.getAttributes());

  FreetypeFontPeer fontpeer = (FreetypeFontPeer) getFont().getPeer();
  synchronized (fontpeer)
    {
      cairoSetFont(nativePointer, fontpeer);
    }
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
/**
 * Returns the number of mouse buttons, or -1 if no mouse is connected.
 * (mentioned in the 1.5 release notes)
 *
 * @throws HeadlessException if the current GraphicsEnvironment is headless.
 * @return an integer number of buttons.
 */
public static int getNumberOfButtons() throws HeadlessException
{
  if( GraphicsEnvironment.isHeadless() )
    throw new HeadlessException();
  return ((ClasspathToolkit)Toolkit.getDefaultToolkit()).
    getMouseNumberOfButtons();
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
/**
 * Returns the local graphics environment. If the java.awt.graphicsenv
 * system property is set, it instantiates the specified class,
 * otherwise it assume that the awt toolkit is a ClasspathToolkit
 * and delegates to it to create the instance.
 *
 * @return the local environment
 */
public static GraphicsEnvironment getLocalGraphicsEnvironment()
{
  if (localGraphicsEnvironment != null)
    return localGraphicsEnvironment;

  String graphicsenv = SystemProperties.getProperty("java.awt.graphicsenv",
                                                    null);
  if (graphicsenv != null)
    {
      try
        {
          // We intentionally use the bootstrap class loader.
          localGraphicsEnvironment = (GraphicsEnvironment)
              Class.forName(graphicsenv).newInstance();
          return localGraphicsEnvironment;
        }
      catch (Exception x)
        {
          throw (InternalError)
              new InternalError("Unable to instantiate java.awt.graphicsenv")
                  .initCause(x);
        }
    }
  else
    {
      ClasspathToolkit tk;
      tk = ((ClasspathToolkit) Toolkit.getDefaultToolkit());
      localGraphicsEnvironment = tk.getLocalGraphicsEnvironment();
      return localGraphicsEnvironment;
    }
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
static ClasspathToolkit tk()
{
  return (ClasspathToolkit) Toolkit.getDefaultToolkit();
}
 

import gnu.java.awt.ClasspathToolkit; //导入依赖的package包/类
protected static ClasspathToolkit tk()
{
  return (ClasspathToolkit)(Toolkit.getDefaultToolkit ());
}