Web Reference: Jan 8, 2024 · If we have a List that we want to convert to a Map, we can create a stream and then convert it to a Map using the Collectors.toMap method. Here, we have two examples: one has an inner Map of Strings, and the other is a Map with Integer and Object values. You can edit some types of transforms, involving complex inputs and outputs, by entering into a nested view in the Graphical Data Mapping editor. Dec 22, 2025 · By the end, you’ll master techniques to flatten nested structures, group data, and apply aggregation logic using streams—skills applicable to countless real-world scenarios like multi-source data consolidation, duplicate resolution, and top-N analysis.
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