<java>wight affiche pas

Bonjour,
j'ai essayé ce prg,dans le résultat weight affiche pas
j'ai une erreur suivant
The method weight() is undefined for the type SpecialCube
The method weight() is undefined for the type SpecialCube

at Essaie.Rectangle.main(Rectangle.java:9)

mon prg est suivant:

public class Cube1 
{
 int length;
 int breadth;
 int height;
 
 public int getVolume()
 {
	 return (length*breadth*height);
 }
 
 Cube1()
 {
	 this(10,10);
	 System.out.println("Finished with default constructor");
 }
 Cube1(int l,int b)
 {
	 this(l,b,10);
	 System.out.println("Finished with parameterized constructor having 2 params");
 }
 Cube1(int l,int b,int h)
 {
	 length=l;
	 breadth=b;
	 height=h;
	 System.out.println("Finished with parameterized constructor having 3 params");
 }
}

package Essaie;

public class SpecialCube extends Cube1 
{
 int weight;
 SpecialCube()
 {
	 super();
	 weight=10;
 }
 SpecialCube(int l,int b)
 {
	 this(l,b,10);
	 System.out.println("Finished with parameterized constructor having 2 params of SpecialCube");
 }
 SpecialCube(int l, int b,int h)
 {
	 super(l,b,h);
	 weight=20;
	 System.out.println("Finished with parameterized constructor having 3 params of SpecialCube");
 }
 
}

package Essaie;
public class Rectangle 
{
public static void main(String[]args)
{
	SpecialCube specialObj1=new SpecialCube();
	SpecialCube specialObj2=new SpecialCube(10,20);
	System.out.println("volume of SpecialCube1 is:"+specialObj1.getVolume());
	System.out.println("weight of SpecialCube1 is:"+specialObj1.weight());
	System.out.println("volume of SpecialCube2 is:"+specialObj2.getVolume());
	System.out.println("weight of SpecialCube2 is:"+specialObj2.weight());
}
}
aidez moi s'il vous plait