How to replace a value conditionally in a Collection, such as replaceIf(Predicate)?

Question

Is there any easy way we could replace a value in a List or Collection if the value is null?

We can always do list.stream().filter(Objects::nonNu

Answer 1

You need a simple map function:

Arrays.asList( new Integer[] {1, 2, 3, 4, null, 5} )
.stream()
.map(i -> i != null ? i : 0)
.forEach(System.out::println); //will print: 1 2 3 4 0 5, each on a new line