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javalistintersection

Efficient intersection of two List<String> in Java?

Question is simple:

I have two List

List<String> columnsOld = DBUtils.GetColumns(db, TableName);
List<String> columnsNew = DBUtils.GetColumns(db, TableName);

And I need to get the intersection of these. Is there a quick way to achieve this?

Solution

  • You can use retainAll method:

    columnsOld.retainAll (columnsNew);