nihaozhanghua的博客

public abstract class Animal { public abstract void eat(); }public class AnimalFactory { /*public static Dog createDog() { return new Dog(); }public static Cat createCat() {

public class FragmentFactoty { public static FragmentFactoty sFragmentFactoty; private FragmentFactoty(){} public static FragmentFactoty getInstance(){ if (sFragmentFactoty == n

public abstract class Animal { public abstract void eat(); }public class Cat extends Animal {@Override public void eat() { System.out.println("猫吃鱼"); } }public class CatFactory implements Fac

package com.example; public interface Observer { void update(Object newData); }package com.example; import java.util.ArrayList; import java.util.List; public class Observable { private d