嬡仩岼疧嚡囡陔

  Null对象的设计   /** * * @author Rock Lee * @Description 标记接口 */ public interface Null { }   /** * * @author Rock Lee * @Description */ public class Person { private St...

      package rock.lee.thinkinjava.c14.typeinfo; import java.util.Arrays; import java.util.List; abstract class Shape{ void draw(){ System.out.println(this+".daw()"); } abstract p...

    public class IceCream { private static Random random = new Random(47); private static final String[] FLAVORS = new String[]{"A","B","C","D","E","F","G","H","I&