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How Can I Efficiently Flatten a Nested List in Java 8?
- Patricia ArquetteOriginal
- 2024-12-20 02:58:09388browse
Flattening Nested Lists in Java 8
Given a 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<Object>> list = ...; // Initialize your nested list
List<Object> flat = list.stream()
.flatMap(List::stream)
.collect(Collectors.toList());
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
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