How can I resolve "an enclosing instance that contains X.Y is required"?

Declare Y as static to avoid creating instance of X.

public class X
{
    public static class Y {
    }
}

First of all you have to create an object of X class (outer class) and then use objX.new InnerClass() syntax to create an object of Y class.

Try,

X x=new X();
X.Y y=x.new Y();

You want to declare static inner classes: public static class Y.

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