Function to convert String to Decimal value?

Question

I need to convert String into Decimal. the isNumeric() method is retuning false if value is Decimal. Another alternate:

try
{
    Integer x = Integer.valueOf(myString);
}
catch (exception e)
{
    // it's not an Integer, try something else
}

Is there any other way to convert Decimal into String?

Note: value which is coming can be Integer or String.

Answer 1

IsNumeric() method works for only Integer value not for decimal value

like this

String str = '10';
system.debug('===strToDec=='+str.isNumeric());

This will return true.

---

String str = '10.25';

Decimal strToDec = decimal.valueOf(str);

system.debug('===strToDec=='+strToDec);

String decToStr = String.valueOf(strToDec);

system.debug('===decToStr=='+decToStr);

Run this code in developer console ad check output.

---

In you case do something like. First convert string to numeric then check and again convert string into decimal for future use

String  str = '10.25';
Integer intCheck = Integer.ValueOf(str);
Decimal decVal = Decimal.ValueOf(str);
if(String.ValueOf(intCheck ).isNumeric())
//use decVal here

Don't understand why you need this.

Answer 2

As Nick Cook suggested, this is one of the rare cases when catching the exception is probably the cleanest approach:

Object o = ...
Decimal d;
try {
    d = Decimal.valueOf(String.valueOf(o));
} catch (TypeException e) {
    d = null;
    // In a controller you might add the exception message e.g. "Invalid decimal: abc"
    ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, e.getMessage()));
}

Answer 3

This works for me.:)

    public static Boolean isValidLoanValue(String value) {
        String amtRegEx = '£{0,1}\\d{1,16}.{0,1}\\d*';
        Pattern MyPattern = Pattern.compile(amtRegEx);
        Matcher MyMatcher = MyPattern.matcher(value);
        Boolean flag = MyMatcher.matches();
        return flag; 
  }