Java 无法在 main 中创建对象

这个问题已经在这里被问到和回答了，但我找不到一个对我有意义的例子.我正在测试一些代码，并试图在Main中从我创建的一个名为Cube的类中创建一个对象，该对象继承自一个名为Solids的类，而这个类继承自一个名为Shape的抽象类(我必须这样做).我的问题是，我可以做些什么来修复我在创建cube1时遇到的"AbstractShape.This Cannot be Reference from a Static Context"错误.抱歉，如果这是补救措施，我现在正在学习

public class AbstractShape {
    public static void main(String[] args)throws Exception{
        Cube cube1 = new Cube(4,4,4);
        cube1.calcArea();
        cube1.print();
        Solids [] MySolids = new Solids[2];


    }
    abstract class Shapes{
        public abstract double getArea();
        public abstract double getVolume();
        public abstract String getName();
    }
    class Solids extends Shapes implements Comparable{
        protected int len;
        protected int wid;
        protected int hig;
        protected double area;
        protected double volume;
        public Solids(int len, int wid, int hig){




        }
        public int compareTo(Object o){
            if (getVolume() >((Shapes)o).getVolume())
                return 1;
            else
                if (getVolume()<((Shapes)o).getVolume())
                    return -1;
                else
                    return 0;
        }
        public void setLen(int len){
            return;
        }
        public void setWid(int wid){
            return;
        }
        public void setHig(int hig){
            return;
        }
        public int getLen(){
            return len;
        }
        public int getWid(){
            return wid;
        }
        public int getHig(){
            return hig;
        }
        public String getName(){
            return "solid";
        }
        public double getArea(){
            return 0.0;
        }
        public double getVolume(){
            return 0.0;
        }
        public void print(){
            System.out.println("Solid of len"+len+" wid"+wid+" hig"+hig);
        }

    }

    class Cube extends Solids{
        protected int len;
        protected int wid;
        protected int hig;
        public Cube(int len, int wid, int hig){
            super(len,wid,hig);
            this.len=len;
            this.wid=wid;
            this.hig=hig;
        }
        public void calcArea(){
            area = 6*len*len;
        }
        public void calcVol(){
            volume = len*len*len;
        }
        public double getVolume(){
            return volume;
        }
        public double getArea(){
            return area;
        }
        public String getName(){
            return "Cube";
        }

    }
}