Popular "java-8" questions | Page 5

I'm trying to come up with a more succinct expression for the "keyMapper" function parameter in the following Collectors.toMap() …

java collections lambda java-8 java-stream

I have an external API that returns me dates as longs, represented as milliseconds since the beginning of the Epoch. …

java datetime java-8 java-time

I am trying to understand the ifPresent() method of the Optional API in Java 8. I have simple logic: Optional<…

java lambda java-8 optional

Javadoc of Collector shows how to collect elements of a stream into a new List. Is there an one-liner that …

java java-8 java-stream collectors

While running sencha app build production I am getting the following error: Error: Registry key 'Software\JavaSoft\Java Runtime Environment'\…

java java-8 sencha-touch sencha-touch-2 sencha-cmd

General question: What's the proper way to reverse a stream? Assuming that we don't know what type of elements that …

java list sorting java-8 java-stream

Is it possible to specify a custom thread pool for Java 8 parallel stream? I can not find it anywhere. Imagine …

java concurrency parallel-processing java-8 java-stream

Sometimes you want to filter a Stream with more than one condition: myList.stream().filter(x -> x.size() &…

java lambda filter java-8 java-stream

I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a …

java arrays java-8 java-stream

I know how to "transform" a simple Java List from Y -> Z, i.e.: List<String> …

java mapreduce java-8 java-stream collectors

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