我的自定义添加行代码抛出异常答案

【问题标题】：Exception throw by my custom Add Row code我的自定义添加行代码抛出异常
【发布时间】：2012-10-17 09:24:35
【问题描述】：

在我的 jTable 中，第一列包含一个数值。当我选择“添加行”时，下一行运行此代码：

DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
int x = jTable1.getRowCount();
String cellValue = "";
if(x > 0){
    java.lang.Object cell = jTable1.getValueAt(x,0); 
    int a = Integer.parseInt(cell.toString());
    int b = a + 1;
    cellValue = Integer.toString(b);
}

java.lang.Object[] os = new Object[]{cellValue,"","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",};
model.addRow(os);
jTable1.setModel(model);
jTable1.setAutoCreateColumnsFromModel(true);

这段代码的重点是添加一个新行，但是会填写新行的第一个值。这是关键数字。不幸的是，键数与行数无关。

当按下“添加行”的 jButton 时，它会抛出此异常。

线程“AWT-EventQueue-0”中的异常 java.lang.ArrayIndexOutOfBoundsException: 837 >= 837

这个数字很有意义，因为 837 是我按下按钮时 jTable 的行数。

提前感谢您的帮助。

【问题讨论】：

很清楚它在说什么，它期望一个小于 837 的数字，即 836... 也是怎么回事“”，};最后。
另外，它看起来是一种非常糟糕的方式来做你想做的事情 - 你使用什么 API？
我是 jTables 的新手。上面的代码只是我最好的尝试。我想要做的是从 Jtable 上最后一行的第 0 列中获取值，将其加 1，然后将该值放入新行的第一列。

标签： java swing jtable

【解决方案1】：

这映射到Vector.size() 中的DefaultTableModel：

int x = jTable1.getRowCount();

这映射到Vector.get(int index):

java.lang.Object cell = jTable1.getValueAt(x,0);

仔细观察Vector.get(int index)会发现：

抛出：ArrayIndexOutOfBoundsException - 索引超出范围（索引 = size()）。

现在自从x == size() 抛出异常。

这应该可以解决问题：

java.lang.Object cell = jTable1.getValueAt(--x,0);

【讨论】：

谢谢！我会试试这个。