〖第6章:面向对象(高级)〗_实例分析:宠物商店笔记
实例要求:
实现一个宠物商店,在宠物商店中可以有多种(由用户决定数量)宠物,试表示出此种关系,并要求可以根据宠物的关键字查找到相应的宠物信息。所需要的宠物信息自行设计。
interface Pet{
public String getName();
public String getColor();
public int getAge();
}
class Cat implements Pet{
private String name;
private String color;
private int age;
public Cat(String name,String color,int age){
this.setName(name);
this.setColor(color);
this.setAge(age);
}
public void setName(String name){
this.name = name;
}
public void setColor(String color){
this.color = color;
}
public int setAge(){
return this.age;
}
}
class Dog implements Pet{
private String name;
private String color;
private int age;
public Dog(String name,String color,int age){
this.setName(name);
this.setColor(color);
this.setAge(age);
}
public void setName(String name){
this.name = name;
}
public void setColor(String color){
this.color = color;
}
public int setAge(){
return this.age;
}
}
class PetShop{
private Pet[] pets;
private int foot;
public PetShop(int len){
if(len>0){
this.pets = new Pet[len];
}else{
this.pets = new Pet[1];
}
}
public boolean add(Pet pet){
if(this.foot<this.pets.length){
this.pets[this.foot] = pet;
this.foot++;
return true;
}else{
return false;
}
}
public Pet[] search(String keyWord){
Pet p[] = null;
int count = 0;
for(int i=0;i<this.pets.length;i++){
if(this.pets[i]!=null){
if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
count++;
}
}
}
p = new Pet[count];
int f = 0;
for(int i=0;i<this.pets.length;i++){
if(this.pets[i]!=null){
if(this.pets[i].getName().indexOf(keyWord)!=-1||this.pets[i].getColor().indexOf(keyWord)!=-1){
p[f] = this.pets[i];
count++;
}
}
}
return p;
}
}
public class PetShopDemo{
public static void main(String args[]){
PetShop ps = new PetShop(5);
ps.add(new Cat("白猫","白色的",2));
ps.add(new Cat("黑猫","黑色的",3));
ps.add(new Cat("花猫","花色的",3));
ps.add(new Dog("拉不拉多","黄色的",3));
ps.add(new Dog("金毛","金色的",2));
ps.add(new Dog("啊黄","黄色的",2));
print(ps.search("黑"));
}
public static void print(Pet p[]){
for(int i=0;i<p.length;i++){
if(p[i]!=null){
System.out.println(p[i].getName()+","+p[i].getColor()+","+p[i].getAge());
}
}
}
}
5.总结:
在本程序中实际上最重要的就是接口的设计,只要接口设计的足够合理,则程序开发会有很高的灵活性,使用接口可以进行解耦合操作。
定义及声明数组时可以使用int[] num = null或 int nul[] = null;两种形式皆可!