Efficient intersection of two List in Java?

Question

Question is simple: I have two List ``` List columnsOld = DBUtils.GetColumns(db, TableName); List columnsNew = DBUtils.GetColumns(db, TableName); ``` And I need to get the intersection of these. Is there a quick way to achieve this?

Accepted Answer

You can use `retainAll` method:

```
columnsOld.retainAll (columnsNew);
```

Efficient intersection of two List<String> in Java?

Solution

Problem