Transform and filter a Java Map with streams

Question

I have a Java Map that I\'d like to transform and filter. As a trivial example, suppose I want to convert all values to Integers then remove the odd entries.

Map         


        

Answer 1

Here is code by AbacusUtil

Map input = N.asMap("a", "1234", "b", "2345", "c", "3456", "d", "4567");

Map output = Stream.of(input)
                          .groupBy(e -> e.getKey(), e -> N.asInt(e.getValue()))
                          .filter(e -> e.getValue() % 2 == 0)
                          .toMap(Map.Entry::getKey, Map.Entry::getValue);

N.println(output.toString());

Declaration： I'm the developer of AbacusUtil.