Introduction
The Component class is the abstract base class for the non-menu user-interface controls of AWT. A component represents an object with graphical representation.
Class declaration
Following is the declaration for java.awt.Component class:
public abstract class Component
extends Object
implements ImageObserver, MenuContainer, Serializable
Field
Following are the fields for java.awt.Component class:
- static float BOTTOM_ALIGNMENT — Ease-of-use constant for getAlignmentY.
- static float CENTER_ALIGNMENT — Ease-of-use constant for getAlignmentY and getAlignmentX.
- static float LEFT_ALIGNMENT — Ease-of-use constant for getAlignmentX.
- static float RIGHT_ALIGNMENT — Ease-of-use constant for getAlignmentX.
- static float TOP_ALIGNMENT — Ease-of-use constant for getAlignmentY().
Class constructors
| S.N. | Constructor & Description |
|---|---|
| 1 | protected Component()This creates a new Component. |
Class methods
| S.N. | Method & Description |
|---|---|
| 1 | boolean action(Event evt, Object what)Deprecated. As of JDK version 1.1, should register this component as ActionListener on component which fires action events. |
| 2 | void add(PopupMenu popup)Adds the specified popup menu to the component. |
| 3 | void addComponentListener(ComponentListener l)Adds the specified component listener to receive component events from this component. |
| 4 | void addFocusListener(FocusListener l)Adds the specified focus listener to receive focus events from this component when this component gains input focus. |
| 5 | void addHierarchyBoundsListener(HierarchyBoundsListener l)Adds the specified hierarchy bounds listener to receive hierarchy bounds events from this component when the hierarchy to which this container belongs changes. |
| 6 | void addHierarchyListener(HierarchyListener l)Adds the specified hierarchy listener to receive hierarchy changed events from this component when the hierarchy to which this container belongs changes. |
| 7 | void addInputMethodListener(InputMethodListener l)Adds the specified input method listener to receive input method events from this component. |
| 8 | void addKeyListener(KeyListener l)Adds the specified key listener to receive key events from this component. |
| 9 | void addMouseListener(MouseListener l)Adds the specified mouse listener to receive mouse events from this component. |
| 10 | void addMouseMotionListener(MouseMotionListener l)Adds the specified mouse motion listener to receive mouse motion events from this component. |
| 11 | void addMouseWheelListener(MouseWheelListener l)Adds the specified mouse wheel listener to receive mouse wheel events from this component. |
| 12 | void addNotify()Makes this Component displayable by connecting it to a native screen resource. |
| 13 | void addPropertyChangeListener(PropertyChangeListener listener)Adds a PropertyChangeListener to the listener list. |
| 14 | void addProperty ChangeListener(String propertyName, Property ChangeListener listener)Adds a PropertyChangeListener to the listener list for a specific property. |
| 15 | void applyComponentOrientation(ComponentOrientation orientation)Sets the ComponentOrientation property of this component and all components contained within it. |
| 16 | boolean areFocusTraversalKeysSet(int id)Returns whether the Set of focus traversal keys for the given focus traversal operation has been explicitly defined for this Component. |
| 17 | int checkImage(Image image, ImageObserver observer)Returns the status of the construction of a screen representation of the specified image. |
| 18 | int checkImage(Image image,int width,int height, ImageObserver observer)Returns the status of the construction of a screen representation of the specified image. |
| 19 | boolean contains(int x,int y)Checks whether this component “contains” the specified point, where x and y are defined to be relative to the coordinate system of this component. |
| 20 | boolean contains(Point p)Checks whether this component “contains” the specified point, where the point’s x and y coordinates are defined to be relative to the coordinate system of this component. |
| 21 | Image createImage(ImageProducer producer)Creates an image from the specified image producer. |
| 22 | Image createImage(int width,int height)Creates an off-screen drawable image to be used for double buffering. |
| 23 | VolatileImage createVolatileImage(int width,int height)Creates a volatile off-screen drawable image to be used for double buffering. |
| 24 | VolatileImage createVolatileImage(int width,int height, ImageCapabilities caps)Creates a volatile off-screen drawable image, with the given capabilities. |
| 25 | void deliverEvent(Event e)Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent e). |
| 26 | void disable()Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean). |
| 27 | protected void disableEvents(long eventsToDisable)Disables the events defined by the specified event mask parameter from being delivered to this component. |
| 28 | void dispatchEvent(AWTEvent e)Dispatches an event to this component or one of its sub components. |
| 29 | void doLayout()Prompts the layout manager to lay out this component. |
| 30 | void enable()Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean). |
| 31 | void enable(boolean b)Deprecated. As of JDK version 1.1, replaced by setEnabled(boolean). |
| 32 | protected void enableEvents(long eventsToEnable)Enables the events defined by the specified event mask parameter to be delivered to this component. |
| 33 | void enableInputMethods(boolean enable)Enables or disables input method support for this component. |
| 34 | protected void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)Support for reporting bound property changes for boolean properties. |
| 35 | void firePropertyChange(String propertyName, byte oldValue, byte newValue)Reports a bound property change. |
| 36 | void firePropertyChange(String propertyName, char oldValue, char newValue)Reports a bound property change. |
| 37 | void firePropertyChange(String propertyName, double oldValue, double newValue)Reports a bound property change. |
| 38 | void firePropertyChange(String propertyName, float oldValue, float newValue)Reports a bound property change. |
| 39 | void firePropertyChange(String propertyName, long oldValue, long newValue)Reports a bound property change. |
| 40 | protected void firePropertyChange(String propertyName, Object oldValue, Object newValue)Support for reporting bound property changes for Object properties. |
| 41 | void firePropertyChange(String propertyName, short oldValue, short newValue)Reports a bound property change. |
| 42 | AccessibleContext getAccessibleContext()Gets the AccessibleContext associated with this Component. |
| 43 | float getAlignmentX()Returns the alignment along the x axis. |
| 44 | float getAlignmentY()Returns the alignment along the y axis. |
| 45 | Color getBackground()Gets the background color of this component. |
| 46 | int getBaseline(int width,int height)Returns the baseline. |
| 47 | Component.BaselineResizeBehavior getBaselineResizeBehavior()Returns an enum indicating how the baseline of the component changes as the size changes. |
| 48 | Rectangle getBounds()Gets the bounds of this component in the form of a Rectangle object. |
| 49 | Rectangle getBounds(Rectangle rv)Stores the bounds of this component into return value rv and return rv. |
| 50 | ColorModel getColorModel()Gets the instance of ColorModel used to display the component on the output device. |
| 51 | Component getComponentAt(int x,int y)Determines if this component or one of its immediate subcomponents contains the (x, y) location, and if so, returns the containing component. |
| 52 | Component getComponentAt(Point p)Returns the component or subcomponent that contains the specified point. |
| 53 | ComponentListener[] getComponentListeners()Returns an array of all the component listeners registered on this component. |
| 54 | ComponentOrientation getComponentOrientation()Retrieves the language-sensitive orientation that is to be used to order the elements or text within this component. |
| 55 | Cursor getCursor()Gets the cursor set in the component. |
| 56 | DropTarget getDropTarget()Gets the DropTarget associated with this Component. |
| 57 | Container getFocusCycleRootAncestor()Returns the Container which is the focus cycle root of this Component’s focus traversal cycle. |
| 58 | FocusListener[] getFocusListeners()Returns an array of all the focus listeners registered on this component. |
| 59 | Set<AWTKeyStroke> getFocusTraversalKeys(int id)Returns the Set of focus traversal keys for a given traversal operation for this Component. |
| 60 | boolean getFocusTraversalKeysEnabled()Returns whether focus traversal keys are enabled for this Component. |
| 61 | Font getFont()Gets the font of this component. |
| 62 | FontMetrics getFontMetrics(Font font)Gets the font metrics for the specified font. |
| 63 | Color getForeground()Gets the foreground color of this component. |
| 64 | Graphics getGraphics()Creates a graphics context for this component. |
| 65 | GraphicsConfiguration getGraphicsConfiguration()Gets the GraphicsConfiguration associated with this Component. |
| 66 | int getHeight()Returns the current height of this component. |
| 67 | HierarchyBoundsListener[] getHierarchyBoundsListeners()Returns an array of all the hierarchy bounds listeners registered on this component. |
| 68 | HierarchyListener[] getHierarchyListeners()Returns an array of all the hierarchy listeners registered on this component. |
| 69 | boolean getIgnoreRepaint() |
| 70 | InputContext getInputContext()Gets the input context used by this component for handling the communication with input methods when text is entered in this component. |
| 71 | InputMethodListener[] getInputMethodListeners() Returns an array of all the input method listeners registered on this component. |
| 72 | InputMethodRequests getInputMethodRequests()Gets the input method request handler which supports requests from input methods for this component. |
| 73 | KeyListener[] getKeyListeners()Returns an array of all the key listeners registered on this component. |
| 74 | <T extends EventListener> T[] getListeners(Class<T> listenerType)Returns an array of all the objects currently registered as FooListeners upon this Component. |
| 75 | Locale getLocale()Gets the locale of this component. |
| 76 | Point getLocation()Gets the location of this component in the form of a point specifying the component’s top-left corner. |
| 77 | Point getLocation(Point rv)Stores the x,y origin of this component into return value rv and return rv. |
| 78 | 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. |
| 79 | Dimension getMaximumSize()Gets the maximum size of this component. |
| 80 | Dimension getMinimumSize()Gets the mininimum size of this component. |
| 81 | MouseListener[] getMouseListeners()Returns an array of all the mouse listeners registered on this component. |
| 82 | MouseMotionListener[] getMouseMotionListeners()Returns an array of all the mouse motion listeners registered on this component. |
| 83 | Point getMousePosition()Returns the position of the mouse pointer in this Component’s coordinate space if the Component is directly under the mouse pointer, otherwise returns null. |
| 84 | MouseWheelListener[] getMouseWheelListeners() Returns an array of all the mouse wheel listeners registered on this component. |
| 85 | String getName()Gets the name of the component. |
| 86 | Container getParent()Gets the parent of this component. |
| 87 | java.awt.peer.ComponentPeer getPeer() Deprecated. As of JDK version 1.1, programs should not directly manipulate peers; replaced by boolean isDisplayable(). |
| 88 | Dimension getPreferredSize()Gets the preferred size of this component. |
| 89 | PropertyChangeListener[] getPropertyChangeListeners()Returns an array of all the property change listeners registered on this component. |
| 90 | Property ChangeListener[] getProperty ChangeListeners (String propertyName)Returns an array of all the listeners which have been associated with the named property. |
| 91 | Dimension getSize()Returns the size of this component in the form of a Dimension object. |
| 92 | Dimension getSize(Dimension rv)Stores the width/height of this component into return value rv and return rv. |
| 93 | Toolkit getToolkit()Gets the toolkit of this component. |
| 94 | Object getTreeLock()Gets this component’s locking object (the object that owns the thread sychronization monitor)for AWT component-tree and layout operations. |
| 95 | int getWidth()Returns the current width of this component. |
| 96 | int getX()Returns the current x coordinate of the components origin. |
| 97 | int getY()Returns the current y coordinate of the components origin. |
| 98 | boolean gotFocus(Event evt, Object what)Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent) |
| 99 | boolean handleEvent(Event evt)Deprecated. As of JDK version 1.1 replaced by processEvent(AWTEvent). |
| 100 | boolean hasFocus()Returns true if this Component is the focus owner. |
| 101 | void hide()Deprecated. As of JDK version 1.1, replaced by setVisible(boolean). |
| 102 | boolean imageUpdate(Image img,int infoflags,int x,int y,int w,int h)Repaints the component when the image has changed. |
| 103 | boolean inside(int x,int y)Deprecated. As of JDK version 1.1, replaced by contains(int, int). |
| 104 | void invalidate()Invalidates this component. |
| 105 | boolean isBackgroundSet()Returns whether the background color has been explicitly set for this Component. |
| 106 | boolean isCursorSet()Returns whether the cursor has been explicitly set for this Component. |
| 107 | boolean isDisplayable()Determines whether this component is displayable. |
| 108 | boolean isDoubleBuffered()Returns true if this component is painted to an offscreen image (buffer)that’s copied to the screen later. |
| 109 | boolean isEnabled()Determines whether this component is enabled. |
| 110 | boolean isFocusable()Returns whether this Component can be focused. |
| 111 | boolean isFocusCycleRoot(Container container)Returns whether the specified Container is the focus cycle root of this Component’s focus traversal cycle. |
| 112 | boolean isFocusOwner()Returns true if this Component is the focus owner. |
| 113 | boolean isFocusTraversable()Deprecated. As of 1.4, replaced by isFocusable(). |
| 114 | boolean isFontSet()Returns whether the font has been explicitly set for this Component. |
| 115 | boolean isForegroundSet()Returns whether the foreground color has been explicitly set for this Component. |
| 116 | boolean isLightweight()A lightweight component doesn’t have a native toolkit peer. |
| 117 | boolean isMaximumSizeSet()Returns true if the maximum size has been set to a non-null value otherwise returns false. |
| 118 | boolean isMinimumSizeSet()Returns whether or not setMinimumSize has been invoked with a non-null value. |
| 119 | boolean isOpaque()Returns true if this component is completely opaque, returns false by default. |
| 120 | boolean isPreferredSizeSet()Returns true if the preferred size has been set to a non-null value otherwise returns false. |
| 121 | boolean isShowing()Determines whether this component is showing on screen. |
| 122 | boolean isValid()Determines whether this component is valid. |
| 123 | boolean isVisible()Determines whether this component should be visible when its parent is visible. |
| 124 | boolean keyDown(Event evt,int key)Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent). |
| 125 | boolean keyUp(Event evt,int key)Deprecated. As of JDK version 1.1, replaced by processKeyEvent(KeyEvent). |
| 126 | void layout()Deprecated. As of JDK version 1.1, replaced by doLayout(). |
| 127 | void list()Prints a listing of this component to the standard system output stream System.out. |
| 128 | void list(PrintStream out)Prints a listing of this component to the specified output stream. |
| 129 | void list(PrintStream out,int indent)Prints out a list, starting at the specified indentation, to the specified print stream. |
| 130 | void list(PrintWriter out)Prints a listing to the specified print writer. |
| 131 | void list(PrintWriter out,int indent)Prints out a list, starting at the specified indentation, to the specified print writer. |
| 132 | Component locate(int x,int y)Deprecated. As of JDK version 1.1, replaced by getComponentAt(int, int). |
| 133 | Point location()Deprecated. As of JDK version 1.1, replaced by getLocation(). |
| 134 | boolean lostFocus(Event evt, Object what)Deprecated. As of JDK version 1.1, replaced by processFocusEvent(FocusEvent). |
| 135 | boolean mouseDown(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). |
| 136 | boolean mouseDrag(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent). |
| 137 | boolean mouseEnter(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). |
| 138 | boolean mouseExit(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent).. |
| 139 | boolean mouseMove(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseMotionEvent(MouseEvent).. |
| 140 | boolean mouseUp(Event evt,int x,int y)Deprecated. As of JDK version 1.1, replaced by processMouseEvent(MouseEvent). |
| 141 | void move(int x,int y)Deprecated. As of JDK version 1.1, replaced by setLocation(int, int). |
| 142 | void nextFocus()Deprecated. As of JDK version 1.1, replaced by transferFocus(). |
| 143 | void paint(Graphics g)Paints this component. |
| 144 | void paintAll(Graphics g)Paints this component and all of its subcomponents. |
| 145 | boolean postEvent(Event e)Deprecated. As of JDK version 1.1, replaced by dispatchEvent(AWTEvent). |
| 146 | boolean prepareImage(Image image,int width,int height, ImageObserver observer)Prepares an image for rendering on this component at the specified width and height. |
| 147 | void print(Graphics g)Prints this component. |
| 148 | void printAll(Graphics g)Prints this component and all of its subcomponents. |
| 149 | protectedvoid processComponentEvent(ComponentEvent e)Processes component events occurring on this component by dispatching them to any registered ComponentListener objects. |
| 150 | protected void processEvent(AWTEvent e)Processes events occurring on this component. |
| 151 | protected void processFocusEvent(FocusEvent e)Processes focus events occurring on this component by dispatching them to any registered FocusListener objects. |
| 152 | protected void processHierarchyBoundsEvent(HierarchyEvent e)Processes hierarchy bounds events occurring on this component by dispatching them to any registered HierarchyBoundsListener objects. |
| 153 | protected void processHierarchyEvent(HierarchyEvent e)Processes hierarchy events occurring on this component by dispatching them to any registered HierarchyListener objects. |
| 154 | protectedvoid processInputMethodEvent(InputMethodEvent e)Processes input method events occurring on this component by dispatching them to any registered InputMethodListener objects. |
| 155 | protected void processKeyEvent(KeyEvent e)Processes key events occurring on this component by dispatching them to any registered KeyListener objects. |
| 156 | protected void processMouseEvent(MouseEvent e)Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects. |
| 157 | protected void processMouseMotionEvent(MouseEvent e)Processes mouse motion events occurring on this component by dispatching them to any registered MouseMotionListener objects. |
| 158 | protected void processMouseWheelEvent(MouseWheelEvent e)Processes mouse wheel events occurring on this component by dispatching them to any registered MouseWheelListener objects. |
| 159 | void remove(MenuComponent popup)Removes the specified popup menu from the component. |
| 160 | void removeComponentListener(ComponentListener l)Removes the specified component listener so that it no longer receives component events from this component. |
| 161 | void removeFocusListener(FocusListener l)Removes the specified focus listener so that it no longer receives focus events from this component. |
| 162 | void removeHierarchyBoundsListener(HierarchyBoundsListener l)Removes the specified hierarchy bounds listener so that it no longer receives hierarchy bounds events from this component. |
| 163 | void removeHierarchyListener(HierarchyListener l)Removes the specified hierarchy listener so that it no longer receives hierarchy changed events from this component. |
| 164 | void removeInputMethodListener(InputMethodListener l)Removes the specified input method listener so that it no longer receives input method events from this component. |
| 165 | void removeKeyListener(KeyListener l)Removes the specified key listener so that it no longer receives key events from this component. |
| 166 | void removeMouseListener(MouseListener l)Removes the specified mouse listener so that it no longer receives mouse events from this component. |
| 167 | void removeMouseMotionListener(MouseMotionListener l)Removes the specified mouse motion listener so that it no longer receives mouse motion events from this component. |
| 168 | void removeMouseWheelListener(MouseWheelListener l)Removes the specified mouse wheel listener so that it no longer receives mouse wheel events from this component. |
| 169 | void removeNotify()Makes this Component undisplayable by destroying it native screen resource. |
| 170 | void removePropertyChangeListener(PropertyChangeListener listener)Removes a PropertyChangeListener from the listener list. |
| 171 | void remove Property ChangeListener(String propertyName, PropertyChange Listener listener)Removes a PropertyChangeListener from the listener list for a specific property. |
| 172 | void repaint()Repaints this component. |
| 173 | void repaint(int x,int y,int width,int height)Repaints the specified rectangle of this component. |
| 174 | void repaint(long tm)Repaints the component. |
| 175 | void repaint(long tm,int x,int y,int width,int height)Repaints the specified rectangle of this component within tm milliseconds. |
| 176 | void requestFocus()Requests that this Component get the input focus, and that this Component’s top-level ancestor become the focused Window. |
| 177 | protected boolean requestFocus(boolean temporary)Requests that this Component get the input focus, and that this Component’s top-level ancestor become the focused Window. |
| 178 | boolean requestFocusInWindow()Requests that this Component get the input focus, if this Component’s top-level ancestor is already the focused Window. |
| 179 | protected boolean requestFocusInWindow(boolean temporary)Requests that this Component get the input focus, if this Component’s top-level ancestor is already the focused Window. |
| 180 | void reshape(int x,int y,int width,int height)Deprecated. As of JDK version 1.1, replaced by setBounds(int, int, int, int). |
| 181 | void resize(Dimension d)Deprecated. As of JDK version 1.1, replaced by setSize(Dimension). |
| 182 | void resize(int width,int height)Deprecated. As of JDK version 1.1, replaced by setSize(int, int). |
| 183 | void setBackground(Color c)Sets the background color of this component. |
| 184 | void setBounds(int x,int y,int width,int height)Moves and resizes this component. |
| 185 | void setBounds(Rectangle r)Moves and resizes this component to conform to the new bounding rectangle r. |
| 186 | void setComponentOrientation(ComponentOrientation o)Sets the language-sensitive orientation that is to be used to order the elements or text within this component. |
| 187 | void setCursor(Cursor cursor)Sets the cursor image to the specified cursor. |
| 188 | void setDropTarget(DropTarget dt)Associate a DropTarget with this component. |
| 189 | void setEnabled(boolean b)Enables or disables this component, depending on the value of the parameter b. |
| 190 | void setFocusable(boolean focusable)Sets the focusable state of this Component to the specified value. |
| 191 | void setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes)Sets the focus traversal keys for a given traversal operation for this Component. |
| 192 | void setFocusTraversalKeysEnabled(boolean focusTraversalKeysEnabled)Sets whether focus traversal keys are enabled for this Component. |
| 193 | void setFont(Font f)Sets the font of this component. |
| 194 | void setForeground(Color c)Sets the foreground color of this component. |
| 195 | void setIgnoreRepaint(boolean ignoreRepaint)Sets whether or not paint messages received from the operating system should be ignored. |
| 196 | void setLocale(Locale l)Sets the locale of this component. |
| 197 | void setLocation(int x,int y)Moves this component to a new location. |
| 198 | void setLocation(Point p)Moves this component to a new location. |
| 199 | void setMaximumSize(Dimension maximumSize)Sets the maximum size of this component to a constant value. |
| 200 | void setMinimumSize(Dimension minimumSize)Sets the minimum size of this component to a constant value. |
| 201 | void setName(String name)Sets the name of the component to the specified string. |
| 202 | void setPreferredSize(Dimension preferredSize)Sets the preferred size of this component to a constant value. |
| 203 | void setSize(Dimension d)Resizes this component so that it has width d.width and height d.height. |
| 204 | void setSize(int width,int height)Resizes this component so that it has width width and height height. |
| 205 | void setVisible(boolean b)Shows or hides this component depending on the value of parameter b. |
| 206 | void show()Deprecated. As of JDK version 1.1, replaced by setVisible(boolean). |
| 207 | void show(boolean b)Deprecated. As of JDK version 1.1, replaced by setVisible(boolean). |
| 208 | Dimension size()Deprecated. As of JDK version 1.1, replaced by getSize(). |
| 209 | String toString()Returns a string representation of this component and its values. |
| 210 | void transferFocus()Transfers the focus to the next component, as though this Component were the focus owner. |
| 211 | void transferFocusBackward()Transfers the focus to the previous component, as though this Component were the focus owner. |
| 212 | void transferFocusUpCycle()Transfers the focus up one focus traversal cycle. |
| 213 | void update(Graphics g)Updates this component. |
| 214 | void validate()Ensures that this component has a valid layout. |
| 215 | Rectangle bounds()Deprecated. As of JDK version 1.1, replaced by getBounds(). |
| 216 | protected AWTEvent coalesceEvents(AWTEvent existingEvent, AWTEvent newEvent)Potentially coalesce an event being posted with an existing event. |
| 217 | protected String paramString()Returns a string representing the state of this component. |
| 218 | protected void firePropertyChange(String propertyName,int oldValue,int newValue)Support for reporting bound property changes for integer properties. |
| 219 | Dimension preferredSize()Deprecated. As of JDK version 1.1, replaced by getPreferredSize(). |
| 220 | boolean prepareImage(Image image, ImageObserver observer)Prepares an image for rendering on this component. |
| 221 | Dimension minimumSize()Deprecated. As of JDK version 1.1, replaced by getMinimumSize(). |
Methods inherited
This class inherits methods from the following classes:
- java.lang.Object
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