How to parse String containing '+' symbol [duplicate]

Question

I have a string which has numbers.

I have a code like this,

    String tempStr = "+123";
    NumberFormat numformat = NumberFormat.getNumberInstance();
    numformat.setParseIntegerOnly(true);
    try {
        int ageInDays = Integer.parseInt(tempStr);
        System.out.println("the age in days "+ageInDays);
    } catch (NumberFormatException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

It is working fine for the number with negative symbols.But I can't do it for number with '+' symbol. It throws NumberFormatException.

So how can I parse a number with '+' symbol from a string?

Answer 1

In the case you are using Java 7 or higher I would recommend using java.lang.Long; or java.lang.Integer; (if you are sure that you will have to parse integers).

It works for both cases.

Later edit: I didn't see that you were using Integer.parseInt();

Therefore I assume that you have Java 6 or less.

In this case try calling the following method before the line with Integer.parseInt(tempStr); to remove the + in case it exists:

private static String removePlusSignIfExists(String numberAsString) {
    if(numberAsString == null || numberAsString.length() == 0){
        return numberAsString;
    }

    if(numberAsString.charAt(0) == '+'){
        return numberAsString.substring(1, numberAsString.length());
    } else {
        return numberAsString;
    }
}