java.math.BigDecimal 不能转换为 java.lang.String？

java.math.BigDecimal cannot be cast to java.lang.String?

提问by Kamran Ashiq

I am trying to add row values of datatype(money) in which zeros after decimal are automatically formed in Jtable like these 55.0000 28.0000 60.0000 20.0000 50.0000

我正在尝试添加数据类型（金钱）的行值，其中在 Jtable 中自动形成小数点后的零，如下所示 55.0000 28.0000 60.0000 20.0000 50.0000

on runtime log showing this error

在运行时日志上显示此错误

java.math.BigDecimal cannot be cast to java.lang.String

java.math.BigDecimal 不能转换为 java.lang.String

Here is the code for rows addition from Jtable

这是 Jtable 行添加的代码

        double total = 0;
        for(int i = 0; i<table.getRowCount(); i++){
            double amount = Double.parseDouble((String) table.getValueAt(1, 6) );
            total+=amount;
        }
        totalSum.setText(String.valueOf(total));

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Is there any way to add float type values??

有没有办法添加浮点类型值？

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回答by Usagi Miyamoto

Try something like this:

尝试这样的事情：

BigDecimal total = BigDecimal.ZERO;
for (int i = 0; i < table.getRowCount(); ++i) {
    final BigDecimal amount = (BigDecimal)table.getValueAt(i, 6);
    total = total.add(amount);
}
totalSum.setText(total.toString());

回答by Jim Garrison

Change

改变

double amount = Double.parseDouble((String) table.getValueAt(1, 6) );

to

到

double amount = table.getValueAt(1, 6).doubleValue();

There's no need to convert a BigDecimalto Stringjust to make a double.

没有必要将 a 转换BigDecimal为String只是为了制作 a double。