Learn about the new Java 10 "var" type, and experiment using JShell with this hands-on tutorial on how to reduce boilerplate code using new type inference for local variables.

In Java, some array types are covariant and/or contravariant. In the case of covariance, this means that if T is compatible to U, then T[] is also compatible to U[].

The types of arrays demonstrated are a single dimension array, a double dimensional array representing multi-dimensional arrays of various sizes, and an array that is really just null.

Even as of early 2015, Java 8 is still fresh and new with something intriguing to offer developers. But Java 9 isn't that far off. Both versions are likely to change how the language works in pretty ...