異常拋出我的自定義添加行代碼

在我的jTable中，第一列包含一個數值。當我選擇「添加行」的下一行運行該代碼：異常拋出我的自定義添加行代碼

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);

這段代碼的一點是要添加新行，但新行中的第一個值將被填掉。這是關鍵的數字。不幸的是，關鍵號碼與行數無關。

當jButton按下「添加行」時，它會拋出這個異常。

在異常線程「AWT-EventQueue的-0」 java.lang.ArrayIndexOutOfBoundsException：837> = 837

數目是有意義，因爲837是行JTable中具有的數量時，我的推按鈕。

感謝您提前提供任何幫助。

來源

2012-10-17 Jake Brasch

這是很清楚的說，它期待數小於837，即836 ...還怎麼了用「」，};最後。 – dngfng

此外，它看起來像一個非常糟糕的方式來做你想做的事情 - 你使用的是什麼API？ – dngfng

我沒有注意到我做到了。 –

這映射到Vector.size()在DefaultTableModel：

int x = jTable1.getRowCount();

這映射到Vector.get(int index)：

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

在Vector.get(int index)隔空仔細觀察就會發現：

拋出：ArrayIndexOutOfBoundsException異常 - 指數超出範圍（索引< 0 || index> = size（））。

現在自x == size()引發異常。

這應該可以解決這個問題：

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

來源

2012-10-17 10:01:24 Tobold

謝謝！我會試試這個。 –

異常拋出我的自定義添加行代碼

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