Shulou(Shulou.com)06/02 Report--

This article introduces how the collection in java is grouped by multiple fields, the content is very detailed, interested friends can refer to it, I hope it can be helpful to you.

List students=new ArrayList (); students.add (new Student ("yyf", 10,170); students.add (new Student ("yyf", 20,170)); students.add (new Student ("yyf2", 10,180)); students.add (new Student ("yyf2", 20,180)); students.add (new Student ("yyf3", 10,180)); students.add (new Student ("yyf3", 20,180 ")) Students.add (new Student ("yyf3", 30,180)); Map collect = students.stream (). Collect (Collectors.groupingBy (value-> value.getName () + "#" + value.getLength ()); System.out.println (collect.toString ()); about how collections in java are grouped into multiple fields to share here. I hope the above can be helpful and learn more. If you think the article is good, you can share it for more people to see.

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