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@@ -39,7 +39,7 @@ private static Map<String, Object> sortByKey(Map<String, Object> map) {
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Map<Object,List<Object>> map = demoList.stream().collect(Collectors.groupingBy(Object::getAttr));
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Map<Object,List<Object>> map = demoList.stream().collect(Collectors.groupingBy(Object::getAttr));
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//2 按照多个字段
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//2 按照多个字段
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Map<String, List<Object>> groupBy = objectList.stream().collect(Collectors
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Map<String, List<Object>> groupBy = objectList.stream().collect(Collectors
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- .groupingBy(o -> o.getApplyId() + "_" + o.getSkuId()));
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+ .groupingBy(o -> o.getAttr1() + "_" + o.getAttr2()));
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```
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```
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