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How to add elements of a Java8 stream into an existing List

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

June 1, 2022
0 Comments

Java8: HashMap to HashMap using Stream / Map-Reduce / Collector

I know how to “transform” a simple Java List from Y -> Z, i.e.: List<String> x; List<Integer> y = x.stream() .map(s -> Integer.parseInt(s)) ...

May 21, 2022
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NullPointerException in Collectors.toMap with null entry values

Collectors.toMap throws a NullPointerException if one of the values is null. I don’t understand this behaviour, maps can contain null pointers as value ...

May 4, 2022
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