A container is an executable software unit containing an application that has been packaged with the libraries and other dependencies it needs to run. Docker and Kubernetes are two technologies that are often referred to when we talk about containers.
Cloud computing relies on virtualization. Virtualization relies on hypervisors. Lewis looks at how virtualization and hypervisors work. He also explains the difference between virtualization and containerization.
For the last few posts we’ve been looking at some interesting aspects of floating point mathematics. There’s a lot more where that came from (which we’ll revisit at a later stage), but this week we’ll take a brief detour to look at something totally different. The other day I was
Lewis takes a look at the interesting and peculiar NaN – Not a Number.
Knowledge and observation are important for any programmer. You need to have Java knowledge – know the rules of the language. You need to observe – see what you are looking at when you code and debug.
RTFS – Read the Fabulous Screen. Lewis takes a look at the importance of reading Java error messages, and how they will help you find your problem.
RTFM – Read the Fabulous Java Manual! Lewis revisits this age-old answer. It is not a good enough answer to give junior programmers, but it should also be a mantra for all Java programmers to keep learning.
I talked about local variable type inference before. But this is worth a repeat, because local variable type inference reduces the verbosity of Java. And Java 11 adds local variable syntax for lambda parameters.
It’s Spring in South Africa. I take a light-hearted look at some comments programmers leave behind in their code. Always a good idea to refactor your comments when you refactor your code.
You already know the switch statement in Java. But did you know that you can use switch expressions in Java to simplify your code?
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