为什么我的程序会在编译的时候出现这样的错误？？
lianxi.java:26: 找不到符号
符号： 方法 setTitleColor(java.awt.Color)
位置： 接口 javax.swing.border.Border
                        B.setTitleColor(Color.RED);
                         ^
1 错误

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

class Lianxi extends JFrame 
{
      JPanel contentPanel;
     
      public JPanel get(Border B)
      {
             int count=0;
             JPanel jpanel=new JPanel();
             jpanel.setLayout(new BorderLayout());
             String str=Integer.toString(count);
             jpanel.add(new JLabel(str,JLabel.CENTER),BorderLayout.CENTER);
            jpanel.setBorder(B);
            B.setTitleColor(Color.RED);
            return jpanel;
      }
      public Lianxi(String str)
      {
            super(str);
                       contentPane=(JPanel)getContentPane();
                       contentPane.setLayout(new GridLayout(2,3));
                       contentPane.add(get(new TitledBorder("Title")));
      }
        public static void main(String[] args)
        {
            Lianxi lianxi=new Lianxi("Hello");
            lianxi.setSize(200,200);
            lianxi.setLocation(180,180);
            lianxi.setVisible(true);
            lianxi.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
}