class MyClass{
private Integer identifier;
//Other attributes
public Integer getIdentifier(){
return this.identifier;
}
}
List<MyClass> listOfMyClass;
Map<Integer,List<MyClass>> mapOfMyCLass = listOfMyClass.stream().collect(Collectors.groupingBy(MyClass::getIdentifier));
Create a Map from a list of objects with Stream (Java 8) grouping the ones that have same identifier.
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