Posts Tagged: Map

Using Optional in Java to check for null

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I see the need for null in Java still, but since the Optional class was introduced I think some of the usages of null can be eliminated by employing some of the capabilities of the Optional class. I will explain in this post a nice way you can implement checking for null in Java by […]


Java, Map and Optional

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I do like the Optional class in Java — it is a long awaited elegant replacement for returning null whenever something isn’t there then relying on if( x != null ) checks or using ?: in the format (x == null) ? “foo” : “bar”. It works great also with the new Java stream classes […]

Java Map and Subtleties of getOrDefault vs computeIfAbsent

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I wrote recently about the new niceties in the Map interface that Java 8 brought to light where I’m highlighting in particular 2 new methods: getOrDefault and computeIfAbsent (see my previous post here about it). These provide a cleaner (and as it turns out faster too!) way of retrieving values from a Map instance. However, […]

Java 8 — Map and the Unknown “Niceties”

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Despite Java 9 making its way into the real world nowadays, I see a lot of Java code out there still relying on the old-style Java 6-like syntax. And I’m not talking about the usage of lambda’s, stream’s and the likes, but rather some of the improvements Java 8 brought to existing classes in the […]