How does custom collectors impact performance or memory usage?

Custom collectors in Java provide developers with the flexibility to create specialized collection strategies that can enhance performance and optimize memory usage. By tailoring collection logic to specific use cases, custom collectors can significantly reduce overhead, minimize temporary object creation, and improve overall processing speed. However, the impact on performance and memory can vary based on implementation details and the type of data being processed. It's essential to balance the benefits with potential complexities in the code.

// Example of a custom collector in Java Collector>> collector = Collector.of( HashMap::new, (map, item) -> map.computeIfAbsent(item.length(), k -> new ArrayList<>()).add(item), (left, right) -> { left.putAll(right); return left; } );

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