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<HTML><HEAD><TITLE>The JComponent Class</TITLE>
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<UL>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#complookapi">Customizing
Component Appearance</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#stateapi">Setting
Component State</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#eventapi">Handling
Events</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#custompaintingapi">Painting
Components</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#containmentapi">Dealing
with the Containment Hierarchy</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#layoutapi">Laying
Out Components</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#sizeapi">Getting
Size and Position Information</A>
<LI><A
href="file:///E:/mdf/java/tutorial/uiswing/components/jcomponent.html#absoluteapi">Specifying
Absolute Size and Position</A> </LI></UL>
<P>
<TABLE border=1>
<CAPTION><A name=complookapi><B>Customizing Component Appearance</B>
</A></CAPTION>
<TBODY>
<TR>
<TH>Method </TH>
<TH>Purpose</TH>
<TR>
<TD><CODE><FONT size=2>void setBorder(Border) <BR>Border getBorder()
</FONT></CODE><BR><EM>(in <CODE>JComponent</CODE>)</EM></TD>
<TD>Set or get the border of the component. See <A
href="file:///E:/mdf/java/tutorial/uiswing/misc/border.html"
target=_top>How to Use Borders</A><A
href="file:///E:/mdf/java/tutorial/uiswing/misc/border.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> for
details. </TD></TR>
<TR>
<TD><CODE><FONT size=2>void setForeground(Color) <BR>Color
getForeground() <BR>void setBackground(Color) <BR>Color
getBackground()</FONT></CODE> <BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM> </TD>
<TD>Set or get the foreground or background color for the component. The
foreground is generally the color used to draw the text in a component.
The background is (not surprisingly) the color of the background areas
of the component, assuming that the component is opaque. </TD></TR>
<TR>
<TD><CODE><FONT size=2>void setOpaque(boolean) </FONT></CODE><BR><EM>(in
<CODE>JComponent</CODE>)</EM></TD>
<TD>Set whether the component is opaque. An opaque component fills its
background with its background color.</TD></TR>
<TR>
<TD><CODE><FONT size=2>boolean isOpaque </FONT></CODE><BR><EM>(in
<CODE>JComponent</CODE>)</EM></TD>
<TD>Get whether the component is opaque. This method (but not
<CODE>setOpaque</CODE>) was added to <CODE>Component</CODE> in 1.2. </TD>
<TR>
<TD><CODE><FONT size=2>void setFont(Font) <BR>Font getFont()
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Set or get the component's font. If a font has not been set for the
component, the font of its parent is returned.</TD></TR>
<TR>
<TD><CODE><FONT size=2>FontMetrics getFontMetrics(Font)
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Get the font metrics for the specified
font.</TD></TR></TR></TBODY></TABLE>
<P>
<TABLE border=1>
<CAPTION><A name=stateapi><B>Setting Component State</B> </A></CAPTION>
<TBODY>
<TR>
<TH>Method </TH>
<TH>Purpose</TH>
<TR>
<TD><CODE><FONT size=2>void setToolTipText(String)
</FONT></CODE><BR><EM>(in <CODE>JComponent</CODE>)</EM></TD>
<TD>Set the text to display in a tool tip. See <A
href="file:///E:/mdf/java/tutorial/uiswing/components/tooltip.html">How
to Use Tool Tips</A> for more information.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void setEnabled(boolean b) <BR>boolean
isEnabled() </FONT></CODE><BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Set or get whether the component is enabled. An enabled component
can respond to user input and generate events.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void setLocale(Locale l) <BR>Locale getLocale()
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Set or get the component's locale. If the component does not have a
locale, the locale of its parent is returned. See <A
href="file:///E:/mdf/java/tutorial/i18n/index.html"
target=_top>Internalization</A><A
href="file:///E:/mdf/java/tutorial/i18n/index.html"><IMG
alt="(in the Internationalization trail)" border=0 height=20
src="The JComponent Class.files/internatsm.GIF" width=20></A> for
information about locales. </TD></TR>
<TR>
<TD><CODE><FONT size=2>void setCursor(Cursor) <BR>Cursor getCursor()
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Set or get the cursor image to display when the mouse is over the
component.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void setVisible(boolean) <BR>boolean isVisible()
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Set or get whether the component is visible. Components are
initially visible, with the exception of top-level components.
</TD></TR></TBODY></TABLE>
<P>
<TABLE border=1>
<CAPTION><A name=eventapi><B>Handling Events</B> <BR>(see <A
href="file:///E:/mdf/java/tutorial/uiswing/overview/event.html"
target=_top>Event Handling</A><A
href="file:///E:/mdf/java/tutorial/uiswing/overview/event.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> for
details) </A></CAPTION>
<TBODY>
<TR>
<TH>Method </TH>
<TH>Purpose</TH>
<TR>
<TD><CODE><FONT size=2>void addComponentListener(ComponentListener)
<BR>void removeComponentListener(ComponentListener)
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/componentlistener.html"
target=_top>component listener</A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/componentlistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the component. Component listeners are notified when the
listened-to component is hidden, shown, moved, or resized.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void addKeyListener(KeyListener) <BR>void
removeKeyListener(KeyListener l) </FONT></CODE><BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/keylistener.html"
target=_top>key listener</A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/keylistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the component. Key listeners are notified when the user types at
the keyboard and the listened-to component has the keyboard focus.</TD></TR>
<TR>
<TD><CODE><FONT size=2>addMouseListener(MouseListener l) <BR>void
removeMouseListener(MouseListener) </FONT></CODE><BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/mouselistener.html"
target=_top>mouse listener </A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/mouselistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the component. Mouse listeners are notified when the user uses
the mouse to interact with the listened-to component.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void addMouseMotionListener(MouseMotionListener)
<BR>void removeMouseMotionListener(MouseMotionListener)
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/mousemotionlistener.html"
target=_top>mouse motion listener </A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/mousemotionlistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the component. Mouse motion listeners are notified when the user
moves the mouse within the listened-to component's bounds.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void addContainerListener(ContainerListener)
<BR>void removeContainerListener(ContainerListener)
</FONT></CODE><BR><EM>(in <CODE>java.awt.Container</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/containerlistener.html"
target=_top>container listener</A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/containerlistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the container. Container listeners are notified when a component
is added to or removed from the listened-to container.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void addFocusListener(FocusListener) <BR>void
removeFocusListener(FocusListener) </FONT></CODE><BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Add or remove a <A
href="file:///E:/mdf/java/tutorial/uiswing/events/focuslistener.html"
target=_top>focus listener</A><A
href="file:///E:/mdf/java/tutorial/uiswing/events/focuslistener.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> to
or from the component. Focus listeners are notified when the listened-to
component gains or loses keyboard focus.</TD></TR>
<TR>
<TD><CODE><FONT size=2>Component getNextFocusableComponent() <BR>void
setNextFocusableComponent(Component) </FONT></CODE><BR><EM>(in
<CODE>JComponent</CODE>)</EM></TD>
<TD>Set or get the next focusable component. <CODE>null</CODE> indicates
that the focus manager should choose the next focusable component
automatically.</TD></TR>
<TR>
<TD><CODE><FONT size=2>void requestFocus() <BR>boolean hasFocus()
</FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Request that the component get the keyboard focus, or detect whether
it has the focus. </TD></TR>
<TR>
<TD><CODE><FONT size=2>boolean contains(int, int) <BR>boolean
contains(Point p) </FONT></CODE><BR><EM>(in
<CODE>java.awt.Component</CODE>)</EM></TD>
<TD>Determine whether the specified point is within the component. The
argument should be specified in terms of the component's coordinate
system. The two <CODE>int</CODE> arguments specify x and y coordinates,
respectively.</TD></TR>
<TR>
<TD><CODE><FONT size=2>Component getComponentAt(int, int)
</FONT></CODE><BR><EM>(in <CODE>java.awt.Container</CODE>)</EM></TD>
<TD>Return the component that contains the specified x, y position. The
top-most child component is returned in the case where components
overlap. This is determined by finding the component closest to the
index 0 that claims to contain the given point via
<CODE>Component.contains()</CODE>.</TD></TR></TBODY></TABLE>
<P>
<TABLE border=1>
<CAPTION><A name=custompaintingapi><B>Painting Components</B> <BR>(see <A
href="file:///E:/mdf/java/tutorial/uiswing/overview/draw.html"
target=_top>Painting</A><A
href="file:///E:/mdf/java/tutorial/uiswing/overview/draw.html"
target=_top><IMG alt="(in the Creating a User Interface trail)" border=0
height=20 src="The JComponent Class.files/uiIcon.gif" width=20></A> for
details) </A></CAPTION>
<TBODY>
<TR>
<TH>Method </TH>
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