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我想计算索引[0][2]中的总值，之前的值是0，但是我已经用计算结果“1/y”替换并显示了它，当我计算总值时，相加的值是之前的值包含“0”，这是我的代码，

     //observation table
                                     //0             1        2    3      4      5     6                       
     titleColumn = new Object[]{"Time (Second)","Medicine", "1/y","x2", "X/Y", "Y^", "Error"};
                               //0   1    2   3   4   5   6
    allData = new Double[][]  {{1.0,1.02,0.0,0.0,0.0,0.0,0.0},
                               {2.0,0.667,0.0,0.0,0.0,0.0,0.0},
                               {3.0,0.367,0.0,0.0,0.0,0.0,0.0},
                               {4.0,0.278,0.0,0.0,0.0,0.0,0.0},
                               {5.0,0.237,0.0,0.0,0.0,0.0,0.0},
                               {6.0,0.187,0.0,0.0,0.0,0.0,0.0},
                               {7.0,0.155,0.0,0.0,0.0,0.0,0.0},
                               {8.0,0.156,0.0,0.0,0.0,0.0,0.0},
                               {9.0,0.142,0.0,0.0,0.0,0.0,0.0},
                               {10.0,0.111,0.0,0.0,0.0,0.0,0.0},
                               {11.0,0.12,0.0,0.0,0.0,0.0,0.0},
                               {12.0,0.097,0.0,0.0,0.0,0.0,0.0},
                               {13.0,0.099,0.0,0.0,0.0,0.0,0.0},
                               {14.0,0.089,0.0,0.0,0.0,0.0,0.0},
                               {15.0,0.079,0.0,0.0,0.0,0.0,0.0},
                               {0.0,0.0,0.0,0.0,0.0,0.0,0.0}};

    tableModelObservation = new DefaultTableModel(allData, titleColumn);
    tableObservation.setModel(tableModelObservation);
    int row,column,inputRow,inputColumn;

    //index [0][2] was replaced with calculation 1/y
    row = 0;
    column = 1;
    inputRow = 0;
    inputColumn = 2;
    double onePerY = 0;
    for(int a=0;a<allData.length;a++){
        onePerY = 1/allData[row][column];
        //is this the way to use getValueAt() and for indicating that the dependent cell has been change ?
        tableObservation.getModel().getValueAt(row, column);
        tableObservation.firePropertyChange("1/y", inputRow, inputColumn);
        tableObservation.getModel().setValueAt(onePerY, inputRow, inputColumn);  
        inputRow++;
        row++;
    }    

    //calculation total 1/y, summing is still using previous value "0"
    row = 0;
    column = 2;
    inputRow = 15;
    inputColumn = 2;
    double totalOnePerY = 0;
    for (int a=0;a<allData.length;a++){
        totalOnePerY += allData[row][column];
        row++;
    }
    //displaying result in row index[15] and column index[2] 
    tableObservation.getModel().setValueAt(totalOnePerY, inputRow, inputColumn);

计算过程后此列值为“1/y” 第 1 列/年

我应该怎么做才能使用新值对其求和？您提供的所有帮助，我将不胜感激，谢谢

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2 回答 2

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如中所示DependentColumn，您可以在getValueAt(). 如果值所依赖的列是可编辑的，请务必触发一个事件，指示从属单元格已更改。

附录：我已经添加了我的代码 getValueAt()，但结果是一样的。

没有你的sscce我猜：我看到你在使用allData数组来构造和更新. 我不确定练习的目标，但您可能不想在这样做之前更新数组。内部使用，构造完成后忽略数组。DefaultTableModelDefaultTableModelVector

于 2013-01-18T07:00:04.460 回答
2

您可以尝试使用EnvelopeTableModewhich 包装原始模型并提供分组功能（SUM、COUNT、AVG...）。

于 2013-01-18T07:13:36.867 回答