How Can I Efficiently Flatten a Nested List in Java 8?

Flattening Nested Lists in Java 8

Given a List> with potentially nested lists, you may encounter the need to merge it into a single List

Using flatMap and Collectors

Leverage the power of Java 8's flatMap operation to flatten the nested lists into a single stream. The process involves converting each internal list into a stream using List::stream and then flattening them using flatMap.

To preserve the original order of elements, you can collect the result using Collectors.toList(), which creates a new list from the flattened stream, ensuring that the order of elements is maintained.

Code Example:

List<list>> list = ...; // Initialize your nested list

List<object> flat = list.stream()
        .flatMap(List::stream)
        .collect(Collectors.toList());</object></list>

This code first converts the nested lists into streams, flattens them into a single stream using flatMap, and finally collects the result into a new List

The above is the detailed content of How Can I Efficiently Flatten a Nested List in Java 8?. For more information, please follow other related articles on the PHP Chinese website!