if i use the following class and move the class InnerClass from an inner to an Outer Level the OuterClass does not compile any more.

    package refactroing.test;
    public class OuterClass {
        private final InnerClass innerClass;
        public OuterClass() { innerClass = new InnerClass(); }
        private static class InnerClass {}
    }

The described refacturing results in the following code for OuterClass

    package refactroing.test;
    public class OuterClass {
        private final InnerClass innerClass;
        public OuterClass() { OuterClass.innerClass = new InnerClass(); }
    }

and InnerClass

  package refactroing.test;
  class InnerClass {}