the jcomponent class.htm

几个简单的java学习代码

      <TH>Purpose</TH>
    <TR>
      <TD><CODE><FONT size=2>void repaint() <BR>void repaint(int, int, int, 
        int) </FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM></TD>
      <TD>Request that all or part of the component be repainted. The four 
        <CODE>int</CODE> arguments specify the bounds (x, y, width, height, in 
        that order) of the rectangle to be painted. </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void repaint(Rectangle) </FONT></CODE><BR><EM>(in 
        <CODE>JComponent</CODE>)</EM></TD>
      <TD>Request that the specified area within the component be repainted. 
      </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void revalidate() </FONT></CODE><BR><EM>(in 
        <CODE>JComponent</CODE>)</EM></TD>
      <TD>Request that the component and its affected containers be laid out 
        again. You shouldn't generally need to invoke this method unless you 
        explicitly change a component's size/alignment hints after it's visible, 
        change a containment hierarchy after it's visible, or perhaps change the 
        data in a component's model directly (without going through the 
        component's API). You might need to invoke <CODE>repaint</CODE> after 
        <CODE>revalidate</CODE>. </TD>
    <TR>
      <TD><CODE><FONT size=2>void paintComponent(Graphics)</FONT></CODE> 
        <BR><EM>(in <CODE>JComponent</CODE>)</EM></TD>
      <TD>Paint the component. Override this method to implement painting for 
        custom components.</TD></TR></TBODY></TABLE>
  <P>
  <TABLE border=1>
    <CAPTION><A name=containmentapi><B>Dealing with the Containment 
    Hierarchy</B> <BR>(see <A 
    href="file:///E:/mdf/java/tutorial/uiswing/overview/hierarchy.html" 
    target=_top>Swing Components and the Containment Hierarchy</A><A 
    href="file:///E:/mdf/java/tutorial/uiswing/overview/hierarchy.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 more 
    information) </A></CAPTION>
    <TBODY>
    <TR>
      <TH>Method </TH>
      <TH>Purpose</TH>
    <TR>
      <TD><CODE><FONT size=2>Component add(Component) <BR>Component 
        add(Component, int) <BR>void add(Component, Object) 
        </FONT></CODE><BR><EM>(in <CODE>java.awt.Container</CODE>)</EM></TD>
      <TD>Add the specified component to the container. The one-argument 
        version of this method adds the component to the end of the container. 
        When present, the <CODE>int</CODE> argument indicates the new 
        component's position within the container. When present, the 
        <CODE>Object</CODE> argument provides layout constraints to the current 
        layout manager.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void remove(int) <BR>void remove(Component comp) 
        <BR>void removeAll() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Container</CODE>)</EM></TD>
      <TD>Remove one of or all of the components from the container. When 
        present, the <CODE>int</CODE> argument indicates the position within the 
        container of the component to remove. </TD>
    <TR>
      <TD><CODE><FONT size=2>JRootPane getRootPane() </FONT></CODE><BR><EM>(in 
        <CODE>JComponent</CODE>)</EM></TD>
      <TD>Get the root pane ancestor for the component.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>Container getParent() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM></TD>
      <TD>Get the component's parent.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>int getComponentCount() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Container</CODE>)</EM></TD>
      <TD>Get the number of components in the container.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>Component getComponent(int) <BR>Component[] 
        getComponents() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Container</CODE>)</EM></TD>
      <TD>Get the one of or all of the components in the container. The 
        <CODE>int</CODE> argument indicates the position of the component to 
        get. </TD></TR></TBODY></TABLE>
  <P>
  <TABLE border=1>
    <CAPTION><A name=layoutapi><B>Laying Out Components</B> <BR>(see <A 
    href="file:///E:/mdf/java/tutorial/uiswing/layout/index.html" 
    target=_top>Laying Out Components Within a Container</A><A 
    href="file:///E:/mdf/java/tutorial/uiswing/layout/index.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 more 
    information) </A></CAPTION>
    <TBODY>
    <TR>
      <TH>Method </TH>
      <TH>Purpose</TH>
    <TR>
      <TD><FONT size=2><CODE>void setPreferredSize(Dimension) <BR>void 
        setMaximumSize(Dimension) <BR>void setMinimumSize(Dimension) 
        </CODE></FONT><BR><EM>(in <CODE>JComponent</CODE>)</EM> </TD>
      <TD>Set the component's preferred, maximum, or minimum size, measured in 
        pixels. The preferred size indicates the best size for the component. 
        The component should be no larger than its maximum size and no smaller 
        than its minimum size. Be aware that these are hints only and might be 
        ignored by certain layout managers. </TD></TR>
    <TR>
      <TD><FONT size=2><CODE>Dimension getPreferredSize() <BR>Dimension 
        getMaximumSize() <BR>Dimension getMinimumSize() 
        </CODE></FONT><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the preferred, maximum, or minimum size of the component, 
        measured in pixels. For non-<CODE>JComponent</CODE> subclasses, which 
        don't have the corresponding setter methods, you can set a component's 
        preferred, maximum, or minimum size by creating a subclass and 
        overriding these methods. </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void setAlignmentX(float) <BR>void 
        setAlignmentY(float) </CODE></FONT><BR><EM>(in 
        <CODE>JComponent</CODE>)</EM> </TD>
      <TD>Set the alignment along the x or y axis. These values indicate how 
        the component would like to be aligned relative to other components. The 
        value should be a number between 0 and 1 where 0 represents alignment 
        along the origin, 1 is aligned the furthest away from the origin, and 
        0.5 is centered, and so on. Be aware that these are hints only and might 
        be ignored by certain layout managers. </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>float getAlignmentX() <BR>float getAlignmentY() 
        </CODE></FONT><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the preferred, maximum, or minimum size of the component. For 
        non-Swing components, which don't have the corresponding setter methods, 
        you can set a component's preferred, maximum, or minimum size by 
        creating a subclass and overriding these methods. </TD></TR>
    <TR>
      <TD><FONT size=2><CODE>void setLayout(LayoutManager) <BR>LayoutManager 
        getLayout() </CODE></FONT><BR><EM>(in 
        <CODE>java.awt.Container</CODE>)</EM> </TD>
      <TD>Set or get the component's layout manager. The layout manager is 
        responsible for sizing and positioning the components within a 
        container. </TD></TR></TBODY></TABLE>
  <P>
  <TABLE border=1>
    <CAPTION><A name=sizeapi><B>Getting Size and Position Information</B> 
    <BR></A></CAPTION>
    <TBODY>
    <TR>
      <TH>Method </TH>
      <TH>Purpose</TH>
    <TR>
      <TD><CODE><FONT size=2>int getWidth() <BR>int getHeight() 
        </FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the current width or height of the component measured in 
      pixels.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>Dimension getSize() <BR>Dimension 
        getSize(Dimension) </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the component's current size measured in pixels. When using the 
        one-argument version of this method, the caller is responsible for 
        creating the <CODE>Dimension</CODE> instance in which the result is 
        returned. </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>int getX() <BR>int getY() 
        </FONT></CODE><BR><EM>(in <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the current x or y coordinate of the component's origin relative 
        to the parent's upper left corner measured in pixels. </TD></TR>
    <TR>
      <TD><CODE><FONT size=2>Rectangle getBounds() <BR>Rectangle 
        getBounds(Rectangle) </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Get the bounds of the component measured in pixels. The bounds 
        specify the component's width, height, and origin relative to its 
        parent. When using the one-argument version of this method, the caller 
        is responsible for creating the <CODE>Rectangle</CODE> instance in which 
        the result is returned.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>Point getLocation() <BR>Point getLocation(Point) 
        <BR>Point getLocationOnScreen() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM></TD>
      <TD>Gets the current location of the component relative to the parent's 
        upper left corner measured in pixels. When using the one-argument 
        version of <CODE>getLocation</CODE> method, the caller is responsible 
        for creating the <CODE>Point</CODE> instance in which the result is 
        returned. The <CODE>getLocationOnScreen</CODE> method returns the 
        position relative to the upper left corner of the screen.</TD>
    <TR>
      <TD><CODE><FONT size=2>Insets getInsets() </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Container</CODE>)</EM></TD>
      <TD>Get the insets of the component.</TD></TR></TBODY></TABLE>
  <P>
  <TABLE border=1>
    <CAPTION><A name=absoluteapi><B>Specifying Absolute Size and Position</B> 
    <BR>(see <A href="file:///E:/mdf/java/tutorial/uiswing/layout/none.html" 
    target=_top>Doing Without a Layout Manager</A><A 
    href="file:///E:/mdf/java/tutorial/uiswing/layout/none.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 more 
    information) </A></CAPTION>
    <TBODY>
    <TR>
      <TH>Method </TH>
      <TH>Purpose</TH>
    <TR>
      <TD><CODE><FONT size=2>void setLocation(int, int) <BR>void 
        setLocation(Point) </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Set the location of the component, in pixels, relative to the 
        parent's upper left corner. The two <CODE>int</CODE> arguments specify x 
        and y, in that order. Use these methods to position a component when you 
        aren't using layout manager.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void setSize(int, int) <BR>void 
        setSize(Dimension) </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Set the size of the component measured in pixels. The two 
        <CODE>int</CODE> arguments specify width and height, in that order. Use 
        these methods to size a component when you aren't using layout 
      manager.</TD></TR>
    <TR>
      <TD><CODE><FONT size=2>void setBounds(int, int, int, int) <BR>void 
        setBounds(Rectangle) </FONT></CODE><BR><EM>(in 
        <CODE>java.awt.Component</CODE>)</EM> </TD>
      <TD>Set the size and location relative to the parent's upper left 
        corner, in pixels, of the component. The four <CODE>int</CODE> arguments 
        specify x, y, width, and height, in that order. Use these methods to 
        position and size a component when you aren't using layout 
    manager.</TD></TR></TBODY></TABLE></BLOCKQUOTE><IMG align=bottom height=8 
src="The JComponent Class.files/blueline.gif" width=550 NATURALSIZEFLAG="3"> 
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