Public Inner Classes

Question

Can someone explain why we can do this and why we need it?

public class OuterClass
{
  public class InnerClass 
  {
  }
}

Why do we need a public inner everything: struct, class, enum or static class?

I think that if it is internal, it should only be closed or protected.

Answer 1

Usually you do not need public nested types, but sometimes they can be useful. They make clear that one type is clearly related to another.

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Answer 2

, . http://msdn.microsoft.com/en-us/library/tdz1bea9(v=VS.71).aspx

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Answer 3

:

public class TrainingFile {

    public List<TrainingFileEntry> getEntries() {
           return ...
    }

    public class TrainingFileEntry {
        int x;
        int y;
   }
}

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Answer 4

, InnerClass . , OuterClass , InnerClass .