What alternatives have you used for collection processing instead of Stream API in your last project?

If the Stream API was not used in the project, alternatives for processing collections could include:

• for or foreach loops for sequential processing of elements.
• Using libraries like Guava, which provide convenient methods for working with collections.
• Manual implementation of filtering, mapping, and reduction functions.

For example, instead of stream().filter(...).map(...) you could write:

List<String> result = new ArrayList<>();
for (Item item : items) {
    if (item.isValid()) {
        result.add(item.transform());
    }
}

This is a more explicit but less declarative way of processing data.