Expressive Puzzlers - Java Puzzlers: Traps, Pitfalls, and Corner Cases - page 12

// Bad code - uses el (l) as a variable name
List<String> l = new ArrayList<String>();
l.add("Foo");
System.out.println(1);
In summary, the lowercase letter el and the digit 1 are nearly identical in most typewriter fonts. To
avoid confusing the readers of your program, never use a lowercase el to terminate a long literal or
as a variable name. Java inherited much from the C programming language, including its syntax for
long literals. It was probably a mistake to allow long literals to be written with a lowercase el .
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