String c=dtm.getValueAt(row, 1).toString(); 造成错误可能是这一行，下面显示错误好像是啥数组越界，这是我查的，

[a15880859175]

代码
private void jButton2ActionActionPerformed(ActionEvent event) {
DefaultTableModel dtm=new DefaultTableModel();


int row=jTable0.getSelectedRow();
if(row<0){
JOptionPane.showMessageDialog(getParent(), "没有选择要修改的数据", "信息提示框", JOptionPane.INFORMATION_MESSAGE);
return;
}
else{
File file=new File("id.txt");
try{
String c=dtm.getValueAt(row, 1).toString(); 造成错误可能是这一行，下面显示错误好像是啥数组越界，这是我查的，但是我不懂是哪里有问题啊？求大神们赐教！！！！！！
file.createNewFile();
FileOutputStream out=new FileOutputStream(file);
out.write((Integer.parseInt(c)));
updategysxxb update=new updategysxxb();
update.setVisible(true);
out.close();
repaint();

}
catch(Exception e){
e.printStackTrace();

}
}


}


错误提示：
系统连接成功
java.lang.ArrayIndexOutOfBoundsException: 2 >= 0
at java.util.Vector.elementAt(Vector.java:474)
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:648)
at Windows.gysxxbFrame.jButton2ActionActionPerformed(gysxxbFrame.java:305)
at Windows.gysxxbFrame.access$3(gysxxbFrame.java:293)
at Windows.gysxxbFrame$5.actionPerformed(gysxxbFrame.java:160)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6527)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6292)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4883)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4705)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2739)
at java.awt.Component.dispatchEvent(Component.java:4705)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:719)
at java.awt.EventQueue$4.run(EventQueue.java:717)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)





String c=dtm.getValueAt(row, 1).toString(); 造成错误可能是这一行，下面显示错误好像是啥数组越界，这是我查的，但是我不懂是哪里有问题啊？求大神们赐教！！！！！！

[花谢尊前不敢香]

dtm没有赋值就使用了，里面为空。

[姜小白-]

从 DefaultTableModel dtm=new DefaultTableModel(); 到 String c=dtm.getValueAt(row, 1).toString(); 都没有对dtm赋值的操作，然后就直接取值了。

getValueAt
public Object getValueAt(int row,  int column)返回 row 和 column 处单元格的属性值。 
指定者：
接口 TableModel 中的 getValueAt
参数：
row - 要查询其值的行
column - 要查询其值的列 
返回：指定单元格处的值 Object 
抛出：  ArrayIndexOutOfBoundsException - 如果给定了无效的 row 或 column

[a15880859175]

就是这个问题，谢谢！