使用JTable，在删除DefaultTableModel数据的时候出现异常

使用JTable，在删除DefaultTableModel数据的时候出现错误
import   java.awt.FlowLayout;
import   java.awt.event.ActionEvent;
import   java.awt.event.ActionListener;
import   java.io.BufferedReader;
import   java.io.File;
import   java.io.FileInputStream;
import   java.io.FileNotFoundException;
import   java.io.FileReader;
import   java.io.IOException;
import   java.io.InputStreamReader;
import   java.util.Vector;

import   javax.swing.JButton;
import   javax.swing.JFileChooser;
import   javax.swing.JFrame;
import   javax.swing.JScrollPane;
import   javax.swing.JTable;
import   javax.swing.JTextField;
import   javax.swing.event.ListSelectionEvent;
import   javax.swing.event.ListSelectionListener;
import   javax.swing.table.DefaultTableModel;


public   class   Demo   extends   JFrame   {

final   public   JTextField   name;
final   public   JTextField   jg;
final   public   JTextField   id;
final   public   JTextField   bj;
public   JTable   table;
StringBuffer   s   =   new   StringBuffer();
StringBuffer   sb;
Vector <String>   vector;
DefaultTableModel   dtm;
Vector   titles;
Vector   allrows;
/**
  *   Launch   the   application
  *   @param   args
  */
public   static   void   main(String   args[])   {
try   {
Demo   frame   =   new   Demo();
frame.setVisible(true);
}   catch   (Exception   e)   {
e.printStackTrace();
}
}

/**
  *   Create   the   frame
  */
public   Demo()   {
super();
getContentPane().setLayout(null);
setBounds(100,   100,   500,   375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final   JScrollPane   scrollPane   =   new   JScrollPane();
scrollPane.setBounds(98,   106,   302,   120);
getContentPane().add(scrollPane);



bj   =   new   JTextField();
bj.setBounds(275,   10,   84,   19);
getContentPane().add(bj);

id   =   new   JTextField();
id.setBounds(121,   47,   84,   19);
getContentPane().add(id);

jg   =   new   JTextField();
jg.setBounds(275,   47,   84,   19);
getContentPane().add(jg);

final   JButton   button   =   new   JButton();
button.addActionListener(new   ActionListener()   {
public   void   actionPerformed(ActionEvent   e)   {

int   row   =   table.getSelectedRow();
int   rows   =   table.getSelectedRowCount();

Vector   vector=   new   Vector();

vector.add(name.getText());
vector.add(bj.getText());
vector.add(id.getText());
vector.add(jg.getText());

dtm.insertRow(row,   vector);
dtm.removeRow(row+1);
}
});
button.setText( "更新 ");
button.setBounds(190,   77,   93,   23);
getContentPane().add(button);

final   JButton   button_1   =   new   JButton();
button_1.addActionListener(new   ActionListener()   {

public   void   actionPerformed(ActionEvent   e)   {
JFileChooser   jf   =   new   JFileChooser();
int   flag   =   jf.showOpenDialog(null);
if(flag==JFileChooser.APPROVE_OPTION)
{
File   file   =   jf.getSelectedFile();
titles   =   new   Vector();
titles.add( "姓名 ");
titles.add( "班级 ");
titles.add( "学号 ");
titles.add( "籍贯 ");

allrows   =   new   Vector <String> ();



FileReader   isr;
BufferedReader   br;
try   {
isr   =   new   FileReader(file);
br   =   new   BufferedReader(isr);
String   s=null;
String[]   str;
try   {
while((s=br.readLine())!=null)
{
str   =   s.split( "\\| ");
vector   =   new   Vector();
vector.add(str[0]);
vector.add(str[1]);
vector.add(str[2]);
vector.add(str[3]);
allrows.add(vector);


}
}   catch   (IOException   e1)   {
//   TODO   Auto-generated   catch   block
e1.printStackTrace();
}
}   catch   (FileNotFoundException   e2)   {
//   TODO   Auto-generated   catch   block
e2.printStackTrace();
}


dtm   =   new   DefaultTableModel();
dtm.setDataVector(allrows,   titles);
table.setModel(dtm);
}
}
});
button_1.setText( "导入 ");
button_1.setBounds(125,   260,   72,   23);
getContentPane().add(button_1);

final   JButton   button_2   =   new   JButton();
button_2.addActionListener(new   ActionListener()   {
public   void   actionPerformed(ActionEvent   arg0)   {
}
});
button_2.setText( "导出 ");
button_2.setBounds(220,   260,   72,   23);
getContentPane().add(button_2);

final   JButton   button_3   =   new   JButton();
button_3.addActionListener(new   ActionListener()   {
public   void   actionPerformed(ActionEvent   e)   {
int   row   =   table.getSelectedRow();
dtm.removeRow(row);}
});
button_3.setText( "删除 ");
button_3.setBounds(315,   260,   72,   23);
getContentPane().add(button_3);

name   =   new   JTextField();
name.setBounds(121,   10,   84,   19);
getContentPane().add(name);


table   =   new   JTable();
table.getSelectionModel().addListSelectionListener(new   ListSelectionListener(){
public   void   valueChanged(ListSelectionEvent   arg0)   {
int   row   =   table.getSelectedRow();
String   xm=table.getValueAt(row,0).toString();
String   bj1   =   table.getValueAt(row,1).toString();
String   xh1   =   table.getValueAt(row,2).toString();
String   jg1   =   table.getValueAt(row,3).toString();

name.setText(xm);
bj.setText(bj1);
id.setText(xh1);
jg.setText(jg1);
}        

});      
scrollPane.setViewportView(table);

}

}


[解决办法]
你就贴个代码出来。。。出现么事错误啊？
[解决办法]
删除报错是因为你删除的最后一笔数据，造成光标丢失，解决方法是删除最后一笔记录后手动换行到上一笔即可