Does Java have an equivalent variable type to C#'s Tuple?

Due to type erasure, there is no way in Java to have exact mirrors of the various Tuple classes in .NET. However, here is a BSD-licensed implementation of Tuple2 and Tuple3 for Java, which mirror the Tuple<T1, T2> and Tuple<T1, T2, T3> types from .NET.

• Tuple.java (static methods to construct tuples with type inference)
• Tuple2.java
• Tuple3.java

One cool thing you can do in Java but not C# is this:

class Bar extends Foo { }

...

Tuple2<? extends Foo, ? extends Foo> tuple = Tuple.create(new Bar(), new Bar());

In C#, you would have to use casts instead:

Tuple<Foo, Foo> tuple = Tuple.Create((Foo)new Bar(), (Foo)new Bar());