Component

Wichtige Methoden
Returntyp	Name der Methode
Eventhandling
void	addXxxListener(XxxListener l) Adds the specified XxxListener to receive XxxEvents from this component. Xxx steht für Component, Focus, HierarchieBounds, Hierarchy, InputMethod, Key, Mouse, MouseMotion, MouseWheel, PropertyChange.
void	removeXxxListener(XxxListener l) Removes the specified XxxListener so that it no longer receives XxxEvents from this component. Xxx steht für Component, Focus, HierarchieBounds, Hierarchy, InputMethod, Key, Mouse, MouseMotion, MouseWheel, PropertyChange.
XxxListener[]	getXxxListeners() Returns an array of all the XxxListeners registered on this component. Xxx steht für Component, Focus, HierarchieBounds, Hierarchy, InputMethod, Key, Mouse, MouseMotion, MouseWheel, PropertyChange.
Graphik
Color	getBackground() Gets the background color of this component.
void	setBackground(Color c) Sets the background color of this component.
Color	getForeground() Gets the foreground color of this component.
void	setForeground(Color c) Sets the foreground color of this component.
Cursor	getCursor() Gets the cursor set in the component.
void	setCursor(Cursor cursor) Sets the cursor image to the specified cursor.
Font	getFont() Gets the font of this component.
void	setFont(Font f) Sets the font of this component.
FontMetrics	getFontMetrics(Font font) Gets the font metrics for the specified font.
Rectangle	getBounds() Gets the bounds of this component in the form of a Rectangle object.
void	setBounds(int x, int y, int width, int height) Moves and resizes this component.
Dimension	getSize() Returns the size of this component in the form of a Dimension object.
void	setSize(Dimension d) Resizes this component so that it has width d.width and height d.height.
int	getHeight() Returns the current height of this component.
int	getWidth() Returns the current width of this component.
int	getX() Returns the current x coordinate of the components origin.
int	getY() Returns the current y coordinate of the components origin.
Point	getLocation() Gets the location of this component in the form of a point specifying the component's top-left corner.
Point	getLocationOnScreen() Gets the location of this component in the form of a point specifying the component's top-left corner in the screen's coordinate space.
Graphics	getGraphics() Creates a graphics context for this component.
GraphicsConfiguration	getGraphicsConfiguration() Gets the GraphicsConfiguration associated with this Component.
void	update(Graphics g) Updates this component.
void	paint(Graphics g) Paints this component.
void	repaint() Repaints this component.
void	setVisible(boolean b) Shows or hides this component depending on the value of parameter b.
Image
Image	createImage(ImageProducer producer) Creates an image from the specified image producer.
Image	createImage(int width, int height) Creates an off-screen drawable image to be used for double buffering.
Fokushandling
Container	getFocusCycleRootAncestor() Returns the Container which is the focus cycle root of this Component's focus traversal cycle.
Set	getFocusTraversalKeys(int id) Returns the Set of focus traversal keys for a given traversal operation for this Component.
boolean	getFocusTraversalKeysEnabled() Returns whether focus traversal keys are enabled for this Component.
boolean	isFocusable() Returns whether this Component can be focused.
boolean	isFocusCycleRoot(Container container) Returns whether the specified Container is the focus cycle root of this Component's focus traversal cycle.
boolean	isFocusOwner() Returns true if this Component is the focus owner.
void	requestFocus() Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window.
boolean	requestFocusInWindow() Requests that this Component get the input focus, if this Component's top-level ancestor is already the focused Window.
void	setFocusable(boolean focusable) Sets the focusable state of this Component to the specified value.
void	setFocusTraversalKeys(int id, Set keystrokes) Sets the focus traversal keys for a given traversal operation for this Component.
void	setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled) Sets whether focus traversal keys are enabled for this Component.
void	transferFocus() Transfers the focus to the next component, as though this Component were the focus owner.
void	transferFocusBackward() Transfers the focus to the previous component, as though this Component were the focus owner.
void	transferFocusUpCycle() Transfers the focus up one focus traversal cycle.
other
Container	getParent() Gets the parent of this component.

Container und atomare Componenten

Aus der AWTKlassenhierarchie erfahren wir, daß es zwei Arten von Componenten gibt, Container und Nicht-Container. Container sind graphische Behälter, deren Hauptfunktion es ist, Componenten (oder selbst wieder Container) zu enthalten. Nicht-Container werden gerne auch atomare Componenten genannt. Sie können keine anderen Komponenten enthalten und müssen, um dargestellt werden zu können in irgendeinem Container liegen.

Konstruktor
protected Component()	Constructs a new Component.