为组件添加边框

import javax.swing.border.*;import javax.swing.*;import java.awt.*;import java.awt.event.*;

public class BorderDemo{    public static void main(String[] args){      JFrame f=new JFrame("BorderDemo");      Container content=f.getContentPane();      JPanel label=new JPanel();      //label.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));//凹陷效果      //label.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));//突起效果            //凹陷效果,并设置突出与阴影的颜色    //  label.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,Color.red,Color.blue));            //凹陷效果,并设置内外部突出与阴影的颜色      //label.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,Color.red,Color.blue,Color.yellow,Color.green));            /*EmptyBorder:建立一个空的边界，可指定边界的宽度，这在区隔组件之间的距离时可能用到。       *EtchedBorder:建立一个四周有凹痕的边界，也可以指定突边与阴影的颜色.       */      //label.setBorder(BorderFactory.createEtchedBorder());             //设置四周有凹痕的边界，并指定内外部的突边与阴影的颜色      //label.setBorder(BorderFactory.createEtchedBorder(Color.red,Color.blue));            //LineBorder:建立一个线条边界，并可以指定线条的颜色与宽度。      //label.setBorder(BorderFactory.createLineBorder(Color.blue,5));            //MatteBorder:建立一个Matte边界，这个方法与createEmptyBorder()有点像，但可以指定边界颜色      //或利用Icon产生边界花纹.      //label.setBorder(BorderFactory.createMatteBorder(5,5,5,5,Color.green));                  //label.setBorder(BorderFactory.createMatteBorder(25,25,25,25,new ImageIcon(".//icons//star.gif")));            /*CompoundBorder: 建立一个复合边界，并可以指定它的内外边界，例如我们可以指定它的外边界为LineBorder,       *它的内边界为MatteBorder。       */            //label.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.blue,5),      //                BorderFactory.createMatteBorder(20,20,18,18,new ImageIcon(".//icons//star.gif"))));            //TitleBorder:建立一个标题边界，我们可以指定边界的标题名称、标题位置、字体与标题颜色。      //label.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.blue,5),"Line Border"      //                ,TitledBorder.LEFT,TitledBorder.TOP));            label.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.lightGray,1),"Line Border"                      ,TitledBorder.LEFT,TitledBorder.ABOVE_TOP,new Font("SansSerif",Font.ITALIC,14),Color.red));      content.add(label);      f.setSize(200,150);      f.show();      f.addWindowListener(new WindowAdapter(){      public void windowClosing(WindowEvent e){         System.exit(0);       }      });     }}