异常抛出我的自定义添加行代码

在我的jTable中，第一列包含一个数值。当我选择“添加行”的下一行运行该代码：异常抛出我的自定义添加行代码

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);

这段代码的一点是要添加新行，但新行中的第一个值将被填掉。这是关键的数字。不幸的是，关键号码与行数无关。

当jButton按下“添加行”时，它会抛出这个异常。

在异常线程 “AWT-EventQueue的-0” java.lang.ArrayIndexOutOfBoundsException：837> = 837

数目是有意义，因为837是行JTable中具有的数量时，我的推按钮。

感谢您提前提供任何帮助。

来源

2012-10-17 Jake Brasch

这是很清楚的说，它期待数小于837，即836 ...还怎么了用“”，};最后。 – dngfng

此外，它看起来像一个非常糟糕的方式来做你想做的事情 - 你使用的是什么API？ – dngfng

我没有注意到我做到了。 –

这映射到Vector.size()在DefaultTableModel：

int x = jTable1.getRowCount();

这映射到Vector.get(int index)：

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

在Vector.get(int index)隔空仔细观察就会发现：

抛出：ArrayIndexOutOfBoundsException异常 - 指数超出范围（索引< 0 || index> = size（））。

现在自x == size()引发异常。

这应该可以解决这个问题：

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

来源

2012-10-17 10:01:24 Tobold

谢谢！我会试试这个。 –

异常抛出我的自定义添加行代码

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