public Id getIndex(Integer id) { return new Id(intValue()); }
Where the class Id is the following:
public class Id { private int id;
public Id(Integer x) { id = x.intValue(); }
public int getId() { return id; }
public void setX(Integer x) { }
public void setY(Integer y) { } }
That gets rid of all your classes and gives you the same result.
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