Question

I am looking for naming guidlines for non functional (utility) extensions of the common classes.

In C# I used to use some of this:

1) ListExtensions, too long but with extension methods ListExtensions never appears. Usage is just.
var productList = new List();
productList.MyExtendedMehod();

2) ListHelpers. This was in old C# 2.0 era, usage is ListHelpers.MyExtendedMethod(productList );

Now I am diving with java. What I have learned is Collections, Arrays classes. So how do you name your helper classes. CollectionUtils? Collections? CollectionsEx?

Answer 1

I think XXXUtils is the common way. Then you can use static imports to get rid of the class name.

class FooUtils {
  public static foo(int x) { ... }
}

static import FooUtils.foo;
foo(5);