4 pages matching "Java"

Traditionally, Java programs have returned null as a way to represent that a value isn’t present. The version 8 of the SDK includes a new class which was made specifically to manage missing values.

I won’t describe the details of the Optional class, but very briefly it’s a container object which may or may not contain a non-null value. Therefore, it is possible to manipulate null values as if they were normal instances without necessarily having to perform a null check at every step.

In this article, I’m going to talk about experiences I gathered while working with Java and describe some anti-patterns I’ve seen about such class.

Because of android SDK not correctly working with java 11, when run flutter doctor we’ll get the following error:

$ flutter doctor
...
Android license status unknown.
Try re-installing or updating your Android SDK Manager.
...

Since with the release 11 some deprecated packages used by the Android SDK were removed, it’s not yet possible to run it with the latest Java versions. As a workaround it’s possible to download the required classes separately and add them to the classpath, or install the latest supported version, java 1.8. This latter approach is the recommended one.

Sometimes it happens that after installing different versions of Java you want to remove the old/unused ones: in this brief tutorial we’ll see how to list all the installed versions and remove the one that are not required anymore from macOS.