package interfaces.interfaceprocessor;
import java.util.*;
import interfaces.interfaceprocessor.Processor;
class Apply
{
    public static void process(Processor p, Object s)
    {
        System.out.println("Using Processor " + p.name());
        System.out.println(p.process(s));
    }
}


public abstract class StringProcessor implements Processor
{
    public String name()
    {
        return getClass().getSimpleName();        //返回本类的标识符名称
    }
    public abstract String process(Object input);
    public static String s = "If she weighs the same as a duck, she's made of wood";  //"如果她像鸭子一样重，她是用木头做的。";
    public static void main(String[] args)
    {
        Apply.process(new Upcase(), s);
        Apply.process(new Downcase(), s);
        Apply.process(new Splitter(), s);
    }
}

class Upcase extends StringProcessor
{
    /*public String name()
    {
        return getClass().getSimpleName();
    }*/
    public String process(Object input)
    {
        return ((String)input).toUpperCase();
    }
}

class Downcase extends StringProcessor
{
    /*public String name()
    {
        return getClass().getSimpleName();
    }*/
    public String process(Object input)
    {
        return ((String)input).toLowerCase();
    }   
}

class Splitter extends StringProcessor
{
    /*public String name()
    {
        return getClass().getSimpleName();
    }*/
    public String process(Object input)
    {
        return Arrays.toString(((String)input).split(" "));
    }
}

错误提示:
StringProcessor.java:8: 错误: 找不到符号
                System.out.println("Using Processor " + p.name());
                                                         ^
  符号:   方法 name()
  位置: 类型为Processor的变量 p
StringProcessor.java:9: 错误: 找不到符号
                System.out.println(p.process(s));
                                    ^
  符号:   方法 process(Object)
  位置: 类型为Processor的变量 p

是不是因为你将方法定义为静态方法，所以里面只能是静态变量呢。

p是什么？p还没有初始化吧