How to Update Each Element in a List in Java 8 Using Stream API

Updating list of POJOs using Java Stream API

Use forEach:

orders.forEach(order -> order.setStatus("H"));

Java 8 stream api code to add a element to a List based on condition keeping the list size same

You can achieve this by doing the following:

alist.stream()
    .flatMap(i -> i == 0 ? Stream.of(i, 0) : Stream.of(i))
    .limit(alist.size())
    .collect(Collectors.toList());

This basically:

1. flatmaps your integer to a stream of itself if non-zero, and a stream of itself and an additional zero if equal to zero
2. limits the size of your list to the original size

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