16

For a string field, is there a way to get the defined length of the field? For example say I allow a maximum of 10 chars, can I get that in apex?

I am not asking how to get the length of a string (i.e. str.length()).

16

You are looking for DescribeFieldResult.getLength():

For string fields, returns the maximum size of the field in Unicode characters (not bytes).

Schema.DescribeFieldResult F = Account.AccountNumber.getDescribe();
Integer lengthOfField = F.getLength();
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13

This is pretty straightforward in both Apex and Visualforce using describes:

Apex:

Integer len = SObjectType.Object__c.Fields.Field__c.Length;

Visualforce:

{!$ObjectType.Object__c.Fields.Field__c.Length}
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5
integer fieldLength = Schema.SObjectType.CustObj__c.fields.CustField__c.getLength();

for more info

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