Is there a way to find the length of a variable in Java?

Question

long AccountNumber = 1234567890;
public void setAccNum(long Number)
    try(the size of the account number is lesser than equal to 10){
        this.Accountnumber = Number;
    }
    catch(Exception e){
        System.out.println("Error: Invalid account number");
    }

In the above code, to validate the length of the account number, is there any function to find the length of the value in AccountNumber variable in Java?

And by the way, most likely you shouldn't be using int/long to store the account number. What if the account number has a trailing zero, etc.? As stupid as it sounds, the most natural type to store account _numbers_ and similar identifiers is String. — Grzegorz Oledzki, Jan 27 '17 at 09:41

score 2 · Answer 1 · answered Jan 27 '17 at 09:38

2

There are many ways to do this, some are

1. String.valueOf(AccountNumber).length()

2. (Long.toString(AccountNumber)).length()

answered Jan 27 '17 at 09:38

jack jay

2,493
1
14
27

score 0 · Answer 2 · answered Jan 27 '17 at 09:39

0

To get the length convert to a string first:

int len = String.valueOf(this.AccountNumber).length();

answered Jan 27 '17 at 09:39

GavinF

387
2
15

score -1 · Answer 3 · answered Jan 27 '17 at 09:41

length is a method of String, so you can for example do

if (stringVar.length != 10)
{
        ...
}

But I'd recommend the usage of Apache Commons Lang3 StringUtils, because it's methods are always null-aware.

For example

if (StringUtils.length(stringVar) != 10)
{
    ...
}

edit: sorry, it's a number, so like others mentioned it must be converted to String first.

Is there a way to find the length of a variable in Java?

3 Answers3