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I am learning Java 8 new features and I came across one situation where I was not able to convince my interviewer how java 8 provide more concise code than older version of java. I have provided an More on stackoverflow.com

'New' features... Java 12 was released in March. There are a few overviews of Java 8 features about, the main details being Functional Interfaces, Method References, Lambdas and the Stream API, Java.time, default and static interface methods. You should be able to find tutorials/examples on these topics. More on reddit.com

I've been using Retrolambda for ages, you don't need Jack if all you're using is lambdas.

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