如何将Excel中单元格的字符串值转换为数值以进行各种计算？

Question

Sheet sheet = w.getSheet(0);
data = new String[sheet.getColumns()][sheet.getRows()];
data1 = new String[sheet.getColumns()][sheet.getRows()];
for (int j = 0; j <sheet.getColumns(); j++) 
{
    for (int i = 0; i < sheet.getRows(); i++) 
    {
        Cell cell = sheet.getCell(j, i);
        data[j][i] = cell.getContents();

        System.out.println(data[j][i]);
        // System.out.println(cell.getContents());
    } System.out.println();
}

I need to find sum of the array data[j][i] , but not able to since its a string.

Answer 1

JXL has a class called NumberCell whose getValue() method returns a double.

See the documentation here .

So if you change your data array to be double you could replace:

Cell cell = sheet.getCell(j, i);
data[j][i] = cell.getContents();

with:

NumberCell cell = (NumberCell)sheet.getCell(j, i);
data[j][i] = cell.getValue();

And then you could do calculations on it.

Of course, if you know the value to be an integer, you can cast it accordingly.

Note that it'll be best to check the type first, eg:

if (sheet.getCell(j, i).getType() == CellType.NUMBER)

And wrap it with try/catch whenever converting unknown / unchecked input.