import  java. awt.  * ; 
import  java. awt. event.  * ; import  javax. swing.  * ; public  class  GridBag 单行单列居中JLabel  { static  JFrame  frame =  new  JFrame ( Thread . currentThread ( ) . getStackTrace ( ) [ 1 ] . getClassName ( ) ) ; static  GridBagLayout  frameGbl =  new  GridBagLayout ( ) ; static  GridBagConstraints  frameGbc =  new  GridBagConstraints ( ) ; static  { frame. addWindowListener ( new  WindowAdapter ( )  { @Override  public  void  windowClosing ( WindowEvent  ev)  { System . exit ( 0 ) ; } } ) ; frame. setBounds ( 100 ,  100 ,  1024 ,  768 ) ; frame. setLayout ( frameGbl) ; } static  JLabel  jlb =  new  JLabel ( """<html><style>#div001{ padding:50px 25px; }.c1{font-size:16px; color:blue;}</style><div id="div001" style="background:red; "><center class=c1 >JLabel</center><center class=c1 >内部文字Html区域居中</center><center class=c1 >setHorizontalAlignment(JLabel.CENTER);</center><center class=c1 >setVerticalAlignment(JLabel.CENTER);</center></div></html>""" ) ; static  { jlb. setOpaque ( true ) ; jlb. setBackground ( Color . DARK_GRAY ) ; jlb. setHorizontalAlignment ( JLabel . CENTER ) ; jlb. setVerticalAlignment ( JLabel . CENTER ) ; GridBagLayout  gbl =  frameGbl;  GridBagConstraints  gbc =  frameGbc; gbl. columnWidths =  new  int [ ]  { 600 } ;   gbl. rowHeights =  new  int [ ]  { 400 } ;     gbc. fill =  GridBagConstraints . BOTH ;   frame. add ( jlb,  gbc) ; } public  static  void  main ( String . . . arguments) throws  Exception { frame. setVisible ( true ) ; } 
} 
 
 
import  java. awt.  * ; 
import  java. awt. event.  * ; 
import  javax. swing.  * ; public  class  GridBag 三行三列居中JLabel  { static  JFrame  frame =  new  JFrame ( Thread . currentThread ( ) . getStackTrace ( ) [ 1 ] . getClassName ( ) ) ; static  GridBagLayout  frameGbl =  new  GridBagLayout ( ) ; static  GridBagConstraints  frameGbc =  new  GridBagConstraints ( ) ; static  { frame. addWindowListener ( new  WindowAdapter ( )  { @Override  public  void  windowClosing ( WindowEvent  ev)  { System . exit ( 0 ) ; } } ) ; frame. setBounds ( 100 ,  100 ,  1024 ,  768 ) ; frame. setLayout ( frameGbl) ; } static  JLabel  jlb =  new  JLabel ( """<html><style>#div001{  padding:50px 25px;  }.c1{font-size:16px; color:blue;}</style><div id="div001" style="background:red; "><center class=c1 >JLabel</center><center class=c1 >内部文字Html区域居中</center><center class=c1 >setHorizontalAlignment(JLabel.CENTER);</center><center class=c1 >setVerticalAlignment(JLabel.CENTER);</center></div></html>""" ) ; static  { jlb. setOpaque ( true ) ; jlb. setBackground ( Color . DARK_GRAY ) ; jlb. setHorizontalAlignment ( JLabel . CENTER ) ; jlb. setVerticalAlignment ( JLabel . CENTER ) ; GridBagLayout  gbl =  frameGbl;  GridBagConstraints  gbc =  frameGbc; gbl. columnWidths =  new  int [ ]  { 9999 , 600 , 9999 } ;   gbl. rowHeights =  new  int [ ]  { 666 , 400 , 666 } ;     gbc. fill =  GridBagConstraints . BOTH ;   gbc. gridx= 1 ;  gbc. gridy= 1 ;   gbc. anchor =  GridBagConstraints . WEST ; frame. add ( jlb,  gbc) ; } public  static  void  main ( String . . . arguments) throws  Exception { frame. setVisible ( true ) ; } } 
 
 
import  java. awt.  * ; 
import  java. awt. event.  * ; import  javax. swing.  * ; public  class  GridBag 单行单列居中JButton  { static  JFrame  frame =  new  JFrame ( Thread . currentThread ( ) . getStackTrace ( ) [ 1 ] . getClassName ( ) ) ; static  GridBagLayout  frameGbl =  new  GridBagLayout ( ) ; static  GridBagConstraints  frameGbc =  new  GridBagConstraints ( ) ; static  { frame. addWindowListener ( new  WindowAdapter ( )  { @Override  public  void  windowClosing ( WindowEvent  ev)  { System . exit ( 0 ) ; } } ) ; frame. setBounds ( 100 ,  100 ,  800 ,  600 ) ; frame. setLayout ( frameGbl) ; } static  JButton  jbt =  new  JButton ( "jbt001" ) ; static  { GridBagLayout  gbl =  frameGbl;  GridBagConstraints  gbc =  frameGbc; gbl. columnWidths =  new  int [ ]  { 300 } ;   gbl. rowHeights =  new  int [ ]  { 100 } ;     gbc. fill =  GridBagConstraints . BOTH ;   frame. add ( jbt,  gbc) ; } public  static  void  main ( String . . . arguments) throws  Exception { frame. setVisible ( true ) ; } } 
 
 
import  java. awt.  * ; 
import  java. awt. event.  * ; 
import  javax. swing.  * ; public  class  GridBag 三行三列居中JButton  { static  JFrame  frame =  new  JFrame ( Thread . currentThread ( ) . getStackTrace ( ) [ 1 ] . getClassName ( ) ) ; static  GridBagLayout  frameGbl =  new  GridBagLayout ( ) ; static  GridBagConstraints  frameGbc =  new  GridBagConstraints ( ) ; static  { frame. addWindowListener ( new  WindowAdapter ( )  { @Override  public  void  windowClosing ( WindowEvent  ev)  { System . exit ( 0 ) ; } } ) ; frame. setBounds ( 100 ,  100 ,  1024 ,  768 ) ; frame. setLayout ( frameGbl) ; } static  JButton  jbt =  new  JButton ( """<html><style>#div001 center{font-size:20px; color:blue; }</style><div id="div001" style="background:yellow; padding:30px; "><center style="font-size:20px; color:black;" >用</center><center>GridBagLayout</center><center>GridBagConstraints</center><center style="font-size:40px; color:black;" >居中</center><center  >黄色的是HTML区域</center></div></html>""" ) ; static  { GridBagLayout  gbl =  frameGbl;  GridBagConstraints  gbc =  frameGbc; gbl. columnWidths =  new  int [ ]  { 9999 , 400 , 9999 } ;   gbl. rowHeights =  new  int [ ]  { 666 , 400 , 666 } ;     gbc. fill =  GridBagConstraints . BOTH ;   gbc. gridx= 1 ;  gbc. gridy= 1 ;   gbc. anchor =  GridBagConstraints . WEST ; frame. add ( jbt,  gbc) ; } public  static  void  main ( String . . . arguments) throws  Exception { frame. setVisible ( true ) ; } }