求各位大神帮小弟指正代码中的异常！多谢

package xiaomo;

import java.awt.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.*;

import javax.swing.*;

public class MessageFace extends JFrame{
	public void CreateJFrame(String title){
		
		//文本框的编辑
		JTextField jt = new JTextField("Please enter static words to search...");
		jt.setBackground(Color.pink);

		//表格的设计
		//JTable 的动态更新
		String[] columnNames={"ID","Name","MobilePhone","Company","QQ number",};
		String[][] tableValues={{"A1","B1","","",""},{"A2","B2","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","xxxxxxxxxxx","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
				{"A3","B3","","",""},{"name-x","B4","","",""},{"A5","B5","","",""},
		};
		JTable table = new JTable(tableValues, columnNames);
		JScrollPane scrollPane = new JScrollPane(table);		
		
		//对窗体的预处理
		JFrame jf = new JFrame(title);
		Container container = jf.getContentPane();
		container.setBackground(Color.green);
		
//		jf.setLayout(null);
		jf.setBounds(900, 100, 415, 472);		//(x,y,width,weight)
		jf.setVisible(true);
//		jf.setResizable(false);  				//去掉最大化
		jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		
		//将面板划分为three个容器
		JPanel jp1 = new JPanel(new GridLayout(1,1));
		JPanel jp2 = new JPanel(new GridLayout(1,5,5,5));
		JPanel jp3 = new JPanel(new GridLayout(1,1));
		//组件所在副容器
		
		//jp2的编辑
		jp2.setBackground(Color.darkGray);
		JButton jb1 = new JButton("Build");
		jb1.setBackground(Color.lightGray);
		JButton jb2 = new JButton("Edit");
		JButton jb3 = new JButton("Delete");
		JButton jb4 = new JButton("Search");
		JButton jb5 = new JButton("Back");
		
		jb1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				new BuildButton(MessageFace.this,"").setVisible(true);
			}
		});

		/*
		 * 在设计代码时，要注重  程序的先后顺序，语言逻辑    否则就会出现启动程序时不显示，
		 * 拖动一下才会显示的怪现象，其实这是逻辑的问题！！！
		 */
		jp1.add(scrollPane,BorderLayout.CENTER);	
		jp2.add(jb1);
		jp2.add(jb2);
		jp2.add(jb3);
		jp2.add(jb4);
		jp2.add(jb5);
		jp3.add(jt);
		container.add(jp3,BorderLayout.NORTH);
		container.add(jp1,BorderLayout.CENTER);
		container.add(jp2,BorderLayout.SOUTH);
		
	}
	public static void main(String[] args){
		// TODO Auto-generated method stub
		new MessageFace().CreateJFrame("People");
	}


}

/*-----------------------------------------------------------------------*/
package xiaomo;

import java.sql.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

	class BuildButton extends JDialog{
		static Connection con;
		static PreparedStatement sql;
		
		public BuildButton(MessageFace messageface,String title){
			
			super(messageface,"Please finish writing .",true);

			//利用箱式布局管理器设计Name栏mb
			//Birthday标签
			Box IDBox = Box.createHorizontalBox();
			IDBox.add(Box.createHorizontalStrut(30));
			JLabel IDLabel = new JLabel("ID:");
			IDBox.add(IDLabel);
			
			IDBox.add(Box.createHorizontalStrut(20));
			final JTextField IDTextField = new JTextField(30);
			IDBox.add(IDTextField);
			IDBox.add(Box.createHorizontalStrut(200));
			
			//Name标签
			Box NameBox = Box.createHorizontalBox();
//			container.add(NameBox,BorderLayout.NORTH);
			NameBox.add(Box.createHorizontalStrut(30));
			JLabel NameLabel = new JLabel("NAME:");
			NameBox.add(NameLabel);