Generic type parameter naming convention for Java (with multiple chars)?

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Oracle recommends the following in Java Tutorials > Generics > Generic Types:

Type Parameter Naming Conventions

By convention, type parameter names are single, uppercase letters. This stands in sharp contrast to the variable naming conventions that you already know about, and with good reason: Without this convention, it would be difficult to tell the difference between a type variable and an ordinary class or interface name.

The most commonly used type parameter names are:

  • E – Element (used extensively by the Java Collections Framework)
  • K – Key
  • N – Number
  • T – Type
  • V – Value
  • S,U,V etc. – 2nd, 3rd, 4th types

You’ll see these names used throughout the Java SE API and the rest of this lesson.

I’d stick to it to avoid the confusion among the developers and possible maintainers.

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