Package com.puppycrawl.tools.checkstyle.checks

Class UpperEllCheck

  • All Implemented Interfaces:
    Configurable, Contextualizable
    public class UpperEllCheck
extends AbstractCheck

    Checks that long constants are defined with an upper ell. That is 'L' and not 'l'. This is in accordance with the Java Language Specification, Section 3.10.1.

    Rationale: The lower-case ell 'l' looks a lot like 1.

    To configure the check: 

     <module name="UpperEll"/>
 
     class Test {
   long var1 = 508987; // OK
   long var2 = 508987l; // violation
   long var3 = 508987L; // OK
 }

    Parent is com.puppycrawl.tools.checkstyle.TreeWalker

    Violation Message Keys:

    • upperEll
    Since:
    3.0