What's wrong with my java class inheritance?

Help, I can't seem to get an output from my inherited shape, whats is wrong with my code? Anyone? I have shortened the code to exclude all the extra constructors and getters and setters, but I hope this provides enough context.

public class Shape {
          public String color;
          public Boolean filled;

          public Shape(String color, Boolean filled) {
              this.color = color;
              this.filled = filled;
          }


          public String toString() {
              retu "Shape[color = " + color + "filled = " + filled;
          }
    -----------------------------------------
    public class Rectangle extends Shape {
         public double width;
         public double length;

         public Rectangle(double width, double length) {
             this.width = width;
             this.length = length;
         }

         @Override
         public String toString() {
             retu "A Rectangle with width = " + width + "and length = " + length;
         }

    }
    -----------------------------------------
    public class TestShape {
       public static void main(String[] args) {

           Shape s1 = new Shape();
           System.out.println(s1);
       }

            Shape r1 = new Rectangle(1.0, 2.0);
            System.out.println(r1);              // Why is there an error?