class Pencil{    String name;    Pencil(){}    Pencil(String name)    {        this.name = name;    }    public void write()    {        System.out.println("write quickly...");    }}interface Eraser{    public static final String color = "白色";    public abstract void clean();}//()class PencilWithEraser extends Pencil implements Eraser{    PencilWithEraser(){}    PencilWithEraser(String name)    {        super(name);    }    //public    public void write()    {        System.out.println("super "+ super.name+ "PencilWithEraser‘s name...");        System.out.println("this "+ this.name+ "PencilWithEraser‘s name...");    }    //void clean()    public void clean()    {        System.out.println("ERROR, use Eraser...");    }}public class jiekou {    public static void main(String[] args)     {        PencilWithEraser p = new PencilWithEraser("中华");        p.write();        p.clean();        System.out.println(p.color);        System.out.println(PencilWithEraser.color);    }}