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@Jayasagar

Jayasagar/Stream14.java

Created December 17, 2017 15:21
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Stream14.java
Map<String, Optional<Integer>> highestDeviceCostCustomerPaid = consumerList
.stream()
.flatMap(consumer -> consumer.getThings()
.stream()
.map(thing -> new AbstractMap.SimpleImmutableEntry<>(consumer.getName(), thing.getCost()))
)
.collect(Collectors.groupingBy(entry -> entry.getKey(),
Collectors.mapping(entry -> entry.getValue(), Collectors.maxBy(Comparator.comparingInt(value -> value)))));
System.out.println(highestDeviceCostCustomerPaid);
// Output: {Bob=Optional[300], Satti=Optional[300], Sri=Optional[200], Malli=Optional[120]}
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