MapString ListOilObject map = slotstreamcollectCollectorsgroupingByOilObjectgetImageName; SetString keys = mapkeySet;解释代码为什么要使用流

The code is using streams to perform a grouping operation on a list of objects of type OilObject based on their imageName property.

In the first line, the stream() method is called on the slot list to convert it into a stream. Then, the collect() method is called with the Collectors.groupingBy() collector. This collector groups the objects based on the imageName property and creates a Map where the keys are the distinct imageName values and the values are lists of OilObject objects with the same imageName.

Using streams and the groupingBy() collector allows for a concise and efficient way to group objects based on a specific property. It eliminates the need for manual iteration and conditionals to perform the grouping operation