public class OuterClass{
    private int out_value = 0;

    public class InnerClass{
        public InnerClass(){
            out_value  = 23;
        }
    }

    public int get(){
        InnerClass innerClass = new InnerClass();
        return out_value;
    }
}

OuterClass outerClass = new OuterClass();
outerClass.get();//out_value的值变成了23

我想问的是,内部类InnerClass具体是怎样改变外部类OuterClass的变量out_value的?