为什么说student不能转成vector错误
package lesson17;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.awt.GridLayout;
import javax.swing.ImageIcon;
import java.io.File;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Connection;
import javax.swing.JTabbedPane;
import java.awt.Container;
import java.sql.ResultSet;
import java.util.Vector;
import javax.swing.JTable;
import javax.swing.JScrollPane;


public class Console
{
private JFrame frame=null;

private JLabel labtop1=null;
private JLabel labtop2=null;
private JLabel labuse=null;
private JLabel labuse2=null;
private JLabel labsex=null;
private JLabel labbir=null;
private JLabel labsch=null;
private JLabel labadd=null;

private JPanel pan1=null;
private JPanel pan2=null;
private JPanel pan3=null;

private JTextField textuse=null;
private JTextField textuse2=null;
private JTextField textsex=null;
private JTextField textbir=null;
private JTextField textsch=null;
private JTextField textadd=null;
private JButton button1=null;
private JButton button2=null;
private JTabbedPane tab=null;





public Console()
{
frame=new JFrame("管理控制台");
pan1=new JPanel();
pan2=new JPanel();
pan3=new JPanel();

//信息添加面板
labtop1=new JLabel("学生管理系统");
labuse=new JLabel("姓 名");
labsex=new JLabel("性 别");
labbir=new JLabel("生 日");
labsch=new JLabel("院 系");
labadd=new JLabel("联系地址");


textuse=new JTextField();
textsex=new JTextField();
textbir=new JTextField();
textsch=new JTextField();
textadd=new JTextField();
labtop1.setBounds(250,5,200,100);

labuse.setBounds(40,150,100,30);
textuse.setBounds(90,150,150,30);

labsex.setBounds(320,150,100,30);
textsex.setBounds(380,150,100,30);

labbir.setBounds(40,220,100,30);
textbir.setBounds(90,220,150,30);

labsch.setBounds(320,220,100,30);
textsch.setBounds(380,220,100,30);

labadd.setBounds(40,290,100,30);
textadd.setBounds(120,290,200,30);


button1=new JButton("添加");
button1.setBounds(240,350,100,30);






//frame.setLayout(null);
pan1.setLayout(null);

//顶头
pan1.add(labtop1);

//姓名栏
pan1.add(labuse);
pan1.add(textuse);
//性别栏
pan1.add(labsex);
pan1.add(textsex);
//生日栏
pan1.add(labbir);
pan1.add(textbir);
//院系
pan1.add(labsch);
pan1.add(textsch);
//联系地址
pan1.add(labadd);
pan1.add(textadd);

pan1.add(button1);



//信息查询面板
pan2.setLayout(null);
labtop2=new JLabel("学生管理系统");
button2=new JButton("查询");
labuse2=new JLabel("姓 名");
textuse2=new JTextField();
labtop2.setBounds(250,5,200,100);
button2.setBounds(240,350,100,30);
labuse2.setBounds(200,180,100,30);
textuse2.setBounds(230,180,100,30);
pan2.add(labtop2);
pan2.add(labuse2);
pan2.add(button2);
pan2.add(textuse2);



Container cont=frame.getContentPane();
tab=new JTabbedPane(JTabbedPane.TOP);
tab.addTab("信息添加",pan1);
tab.addTab("信息查询",pan2);
frame.add(tab);
frame.setSize(600,450);