abstract class material{    int weight;}class wood extends material{}class plastic extends material{}class metal extends material{}interface furniture {    material getMaterial();    void setMaterial(material m);}class table implements furniture{    material mat;    public material getMaterial(){        return mat;    }    public void setMaterial(material m){        mat =m;    }}class bench implements furniture{    material mat;    public material getMaterial(){        return mat;    }    public void setMaterial(material m){        mat =m;    }}class chair implements furniture{    material mat;    public material getMaterial(){        return mat;    }    public void setMaterial(material m){        mat =m;    }}

There are 3 products table,chair and bench. Product can be of wood ,metal and plastic . Design a class structures for this.