第一题:在第三题的基础上进行功能扩展，要求如下：
增加一种新的动物类型：pig（猪），实现shout（）方法
修改Store类的get（）方法：如果传入的参数是字符串dog，则返回 一个Dog对象；如果传入的参数是字符串pig则返回一个pig对象；否则，返回一个Cat对象
在测试类Test中加以测试：向Store类的个get（）方法中传入参数“pig”，并在返回的对象中调用shout（）方法，看看于预期的结果是否一致。
package cn.bdqn.bemo99;
public interface Animal {
void shout();
}
package cn.bdqn.bemo99;
public class Dog implements Animal {
public void shout() {
System.out.println("W W!");
}
}
package cn.bdqn.bemo99;
public class Cat implements Animal {
@Override
public void shout() {
System.out.println("M M!");
}
}
package cn.bdqn.bemo99;
public class Pig implements Animal {
@Override
public void shout() {
System.out.println("O O!");
}
}
package cn.bdqn.bemo99;
import java.security.CryptoPrimitive;
public class Store {
public static Animal shout(String choice) {
if (choice.equalsIgnoreCase("dog")) {
return new Dog();
} else {if (choice.equalsIgnoreCase("pig")) {
return new Pig();
}else
return new Cat();
}
}
}
package cn.bdqn.bemo99;
public class AnimalTest {
public static void main(String[] args) {
Animal a = Store.shout("dog");
a.shout();
Animal a1=Store.shout("cat");
a1.shout();
Animal a2=Store.shout("pig");
a2.shout();
}
第二题：对贯穿本书的案例电子宠物系统的类结构进行重构，
package cn.bdqn.bemo999;
public interface Eatable {
void eat(); //吃饭功能
}
package cn.bdqn.bemo999;
public interface FlyingDiscCatchable {
void catchingFlyDisc(); //接飞盘功能
}
package cn.bdqn.bemo999;
public interface Swimmable {
void swim(); //游泳功能
}
package cn.bdqn.bemo999;
public abstract class Pet {
private String name;//名字
private int health;//健康值
private int love;//亲密度
public String getName(){
return name;
}
public int getHealth() {
return health;
}
public void setHealth(int health) {
this.health = health;
}
public int getLove() {
return love;
}
public void setLove(int love) {
this.love = love;
}
public void setName(String name) {
this.name = name;
}
public abstract void show();
}
package cn.bdqn.bemo999;
public class Dog extends Pet implements Eatable, FlyingDiscCatchable {
@Override
public void catchingFlyDisc() {
System.out.println("狗狗"+this.getName()+"正在玩接飞盘！");
}
@Override
public void eat() {
System.out.println("狗狗"+this.getName()+"吃饱了！");
}
@Override
public void show() {
System.out.println("宠物自白：\n我的名字叫："+this.getName()+"\n我的健康值是："+this.getHealth()+"\n和主人的亲密度为："+this.getLove());
eat();
catchingFlyDisc();
}
}
package cn.bdqn.bemo999;
public class Penguin extends Pet implements Eatable, Swimmable {
@Override
public void swim() {
System.out.println("企鹅"+this.getName()+"正在游泳");
}
@Override
public void eat() {
System.out.println("企鹅"+this.getName()+"吃饱了");
}
@Override
public void show() {
System.out.println("宠物的自白：\n我的名字叫："+this.getName()+"\n我的健康值为："+this.getHealth()+"和主人的亲密度"+this.getLove());
eat();
swim();
}
}
package cn.bdqn.bemo999;
public class Test {
public static void main(String[] args) {
Pet pet=new Dog();
pet.setName("泰迪");//赋值
pet.setHealth(100);
pet.setLove(50);
pet.show();//输出信息
Pet pet1=new Penguin();
pet1.setName("小企鹅");//赋值
pet1.setHealth(100);
pet1.setLove(60);
pet1.show();//输出信息
}
}