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About stream flow, write it down briefly------

2022-04-23 16:49:00 【A coir boat in the broken white clouds】

Comma concatenation list An object field in

millAndKilns.stream().map(MillAndKiln::getName).collect(Collectors.joining(","));

Extract a field in the object set into a new set

List<Long> appUnitIds = appUnitVOPage.getRecords().stream().map(AppUnitListVO::getId).collect(Collectors.toList());

according to id Make up of key-value form

 Map<Long, List<AppField>> appFieldMap = fields.stream().collect(Collectors.groupingBy(AppField::getAppId));

Judge whether the MOG object field in the collection contains the specified value

 versions.stream().map(AppVersion::getIsShelf).collect(Collectors.toList()).contains(PlatformConstant.IsShelf.ON_THE_SHELF)

The collection is sorted according to the MOG field

versions.stream().sorted(Comparator.comparing(AppVersion::getUpdateTime).reversed()).collect(Collectors.toList())

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