How can the scale of a BigDecimal be validated?

Question

We currently have some code for validating a string as a BigDecimal of the correct scale that looks like:

try {
    new BigDecimal(amount).setScale(4);
} catch (Exception e) {
    //...something
}

I would prefer it looked a little more like this:

if(!BigDecimalValidator.getInstance().isValid(amount)){
   ...something 
}

However this validates that the input can be parsed, but does not validate that the scale is correct.

How can this be done using a validator? Is the only way to do this by comparing the scale or catching the exception?

Answer 1

创建一个验证器，并将第一个示例中的代码放入其中。