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should choose the next focusable component automatically.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/awt/Dimension.html">Dimension</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getPreferredSize()">getPreferredSize</A></B>()</CODE><BR> If the preferredSize has been set to a non-null value just returns it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/swing/KeyStroke.html">KeyStroke</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getRegisteredKeyStrokes()">getRegisteredKeyStrokes</A></B>()</CODE><BR> Returns the KeyStrokes that will initiate registered actions.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/swing/JRootPane.html">JRootPane</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getRootPane()">getRootPane</A></B>()</CODE><BR> Returns the JRootPane ancestor for a component</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/awt/Dimension.html">Dimension</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getSize(java.awt.Dimension)">getSize</A></B>(<A HREF="../../java/awt/Dimension.html">Dimension</A> rv)</CODE><BR> Stores the width/height of this component into "return value" <b>rv</b> and returns <b>rv</b>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/awt/Point.html">Point</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getToolTipLocation(java.awt.event.MouseEvent)">getToolTipLocation</A></B>(<A HREF="../../java/awt/event/MouseEvent.html">MouseEvent</A> event)</CODE><BR> Returns the tooltip location in this component's coordinate system.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getToolTipText()">getToolTipText</A></B>()</CODE><BR> Returns the tooltip string that has been set with setToolTipText().</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getToolTipText(java.awt.event.MouseEvent)">getToolTipText</A></B>(<A HREF="../../java/awt/event/MouseEvent.html">MouseEvent</A> event)</CODE><BR> Returns the string to be used as the tooltip for <i>event</i>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/awt/Container.html">Container</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getTopLevelAncestor()">getTopLevelAncestor</A></B>()</CODE><BR> Returns the top-level ancestor of this component (either the containing Window or Applet), or null if this component has not been added to any container.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getUIClassID()">getUIClassID</A></B>()</CODE><BR> Returns the UIDefaults key used to look up the name of the swing.plaf.ComponentUI class that defines the look and feel for this component.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getVerifyInputWhenFocusTarget()">getVerifyInputWhenFocusTarget</A></B>()</CODE><BR> Get the value that indicates whether the input verifier for the current focus owner will be called before this component requests focus.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/awt/Rectangle.html">Rectangle</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getVisibleRect()">getVisibleRect</A></B>()</CODE><BR> Returns the Component's "visible rectangle" - the intersection of this component's visible rectangle: </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getWidth()">getWidth</A></B>()</CODE><BR> Returns the current width of this component.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getX()">getX</A></B>()</CODE><BR> Returns the current x coordinate of the component's origin.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#getY()">getY</A></B>()</CODE><BR> Returns the current y coordinate of the component's origin.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#grabFocus()">grabFocus</A></B>()</CODE><BR> Sets the focus on the receiving component if it doesn't already have it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#hasFocus()">hasFocus</A></B>()</CODE><BR> Returns true if this Component has the keyboard focus.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#hide()">hide</A></B>()</CODE><BR> <B>Deprecated.</B> <I>As of JDK version 1.1, replaced by <code>setVisible(boolean)</code>.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isDoubleBuffered()">isDoubleBuffered</A></B>()</CODE><BR> Returns whether the receiving component should use a buffer to paint.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isFocusCycleRoot()">isFocusCycleRoot</A></B>()</CODE><BR> Override this method and return true if your component is the root of of a component tree with its own focus cycle.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isFocusTraversable()">isFocusTraversable</A></B>()</CODE><BR> Identifies whether or not this component can receive the focus.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isLightweightComponent(java.awt.Component)">isLightweightComponent</A></B>(<A HREF="../../java/awt/Component.html">Component</A> c)</CODE><BR> Returns true if this component is a lightweight, that is, if it doesn't have a native window system peer.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isManagingFocus()">isManagingFocus</A></B>()</CODE><BR> Override this method and return true if your JComponent manages focus.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isMaximumSizeSet()">isMaximumSizeSet</A></B>()</CODE><BR> Returns true if the maximum size has been set to a non-null value otherwise returns false.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isMinimumSizeSet()">isMinimumSizeSet</A></B>()</CODE><BR> Returns true if the minimum size has been set to a non-null value otherwise returns false.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isOpaque()">isOpaque</A></B>()</CODE><BR> Returns true if this component is completely opaque.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isOptimizedDrawingEnabled()">isOptimizedDrawingEnabled</A></B>()</CODE><BR> Returns true if this component tiles its children -- that is, if it can guarantee that the children will not overlap.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isPaintingTile()">isPaintingTile</A></B>()</CODE><BR> Returns true if the receiving component is currently painting a tile.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JComponent.html#isPreferredSizeSet()">isPreferredSizeSet</A></B>()</CODE>⌨️ 快捷键说明
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