Is not an enclosing class Java

Question

I m trying to make a Tetris game and I m getting the compiler error      Shape is not an enclosing class   when I try to create an object  public class Test       public static void main String   args            Shape s   new Shapes ZShape              I m using inner classes for each shape  Here s part of my code  public class Shapes       class AShape             class ZShape             What am I doing wrong

User · Accepted Answer

ZShape is not static so it requires an instance of the outer class   The simplest solution is to make ZShape and any nested class static if you can   I would also make any fields final or static final that you can as well

User · Answer

One thing I didn t realize at first when reading the accepted answer was that making an inner class static is basically the same thing as moving it to its own separate class   Thus  when getting the error     xxx is not an enclosing class   You can solve it in either of the following ways    Add the static keyword to the inner class  or Move it out to its own separate class

User · Answer

I have encountered the same problem  I solved by creating an instance for every inner public Class  as for you situation  i suggest you use inheritance other than inner classes   public class Shape        private String shape       public ZShape zShpae      public SShape sShape       public Shape          int     coords    noShapeCoords        shape    NoShape         zShape   new ZShape          sShape   new SShape               class ZShape        int     coords    zShapeCoords        String shape    ZShape              class SShape        int     coords   sShapeCoords        String shape    SShape             etc     then you can new Shape    and visit ZShape through shape zShape

User · Answer

What I would suggest is not converting the non-static class to a static class because in that case  your inner class can t access the non-static members of outer class   Example    class Outer       class Inner                               So  in such case  you can do something like   Outer o   new Outer    Outer Inner obj   o new Inner

User · Answer

As stated in the docs   OuterClass InnerClass innerObject   outerObject new InnerClass

User · Answer

No need to make the nested class as static but it must be public  public class Test       public static void main String   args            Shape shape   new Shape            Shape s   shape new Shape ZShape

User · Answer

Shape shape   new Shape    Shape ZShape zshape   shape new ZShape

User · Answer

Suppose RetailerProfileModel is your Main class and RetailerPaymentModel is an inner class within it  You can create an object of the Inner class outside the class as follows   RetailerProfileModel RetailerPaymentModel paymentModel           new RetailerProfileModel   new RetailerPaymentModel

User · Answer

Sometimes  we need to create a new instance of an inner class that can t be static because it depends on some global variables of the parent class  In that situation  if you try to create the instance of an inner class that is not static  a not an enclosing class error is thrown   Taking the example of the question  what if ZShape can t be static because it need global variable of Shape class    How can you create new instance of ZShape  This is how   Add a getter in the parent class   public ZShape getNewZShape         return new ZShape        Access it like this   Shape ss   new Shape    ZShape s   ss getNewZShape

User · Answer

To achieve the requirement from the question  we can put classes into interface    public interface Shapes       class AShape            class ZShape            and then use as author tried before    public class Test       public static void main String   args            Shape s   new Shapes ZShape              If we looking for the proper  logical  solution  should be used fabric design pattern

User · Answer

In case if Parent class is singleton use following way   Parent Child childObject    Parent getInstance    new Child      where getInstance   will return parent class singleton object

[java] Is not an enclosing class Java

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