Java实验项目三——宠物商店

Program：宠物商店的设计（继承，接口，线性线性表）

Description：本题未实现图形用户界面，项目结构描述如下：

classes.Pet：定义宠物接口，只要实现该接口的宠物类，都可存储进宠物商店

　　　　　　（本例定义的接口为标识接口，未定义任何方法，只用于标识）

classes.PetShop：宠物商店类,采用了单例设计模式

classes.entity.Dog：宠物狗类，实现了Pet接口

classes.entity.Cat：宠物猫类，实现了Pet接口

main.TestDemo：测试类

classes.Pet

/*
 * Description:定义宠物标识接口，只要是实现此接口的类都为宠物类，都可放进宠物商店
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */


package classes;

public interface Pet {

}

classes.PetShop

/*
 * Description:定义宠物商店,采用单例设计模式
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */


package classes;

import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;

public class PetShop {

    private List<Pet> pets = new ArrayList<Pet>();     //存取宠物
    private static PetShop instance = null;            //声明私有对象
    
    //定义私有构造方法
    private PetShop() {    }
    
    //取得宠物商店的实例
    public static PetShop getInstance() {
        
        if( PetShop.instance == null ) {
            
            PetShop.instance = new PetShop();
        }
        return PetShop.instance;
    }
    
    //取得宠物的数量
    public int getCount() {
        
        return this.pets.size();
    }
    
    //添加宠物
    public void add(Pet pet) {
        
        if( pet != null ) {
            
            this.pets.add(pet);
        }
    }
    
    //打印所有宠物
    
    public void displayInfo() {
        
        Iterator<Pet> ite = this.pets.iterator();
        while( ite.hasNext() ) {
            
            System.out.println( ite.next() );
        }
    }
    
}

classes.entity.Dog

/*
 * Description:定义宠物狗类
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */

package classes.entity;

import classes.Pet;

public class Dog implements Pet {
    
    private String name;
    private String color;
    private int age;
    
    //定义构造方法
    
    public Dog() {}
    
    public Dog(String name, String color, int age) {
        
        super();
        this.name = name;
        this.color = color;
        this.age = age;
    }

    
    //定义setter()和getter()方法

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    
    //覆写toString()方法
    @Override
    public String toString() {
        return "Dog [name=" + name + ", color=" + color + ", age=" + age + "]";
    }

}

classes.entity.Cat

/*
 * Description:定义宠物猫类
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */

package classes.entity;

import classes.Pet;

public class Cat implements Pet {

    private String name;
    private String color;
    private int age;
    
    //定义构造方法
    
    public Cat() {}
    
    public Cat(String name, String color, int age) {
        
        super();
        this.name = name;
        this.color = color;
        this.age = age;
    }

    
    //定义setter()和getter()方法

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    
    //覆写toString()方法
    @Override
    public String toString() {
        return "Cat [name=" + name + ", color=" + color + ", age=" + age + "]";
    }
    
}

main.TestDemo

/*
 * Description:定义测试类，测试宠物商店
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */

package main;

import classes.*;
import classes.entity.Cat;
import classes.entity.Dog;

public class TestDemo {

    public static void main(String args[]) {
        
        //取得宠物商店的实例
        PetShop shop = PetShop.getInstance();
        
        //添加宠物
        shop.add( new Dog("小黑","黑色",2) );
        shop.add( new Dog("小白","白色",3) );
        shop.add( new Cat("小喵","黄色",1) );
        shop.add( new Cat("大喵","白色",3) );
        
        //打印所有宠物
        shop.displayInfo();

    }        

}

/* * 
 * Description:定义宠物商店,采用单例设计模式 
 *
 * Written By:Cai 
 * 
 * Date Written:2017-10-18 
 * 
 */

package classes;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
public class PetShop {
    private List<Pet> pets = new ArrayList<Pet>();//存取宠物
    private static PetShop instance = null;//声明私有对象
    //定义私有构造方法
    private PetShop() {}
    //取得宠物商店的实例
    public static PetShop getInstance() {
        if( PetShop.instance == null ) {
            PetShop.instance = new PetShop();
        }
        return PetShop.instance;
    }
    //取得宠物的数量
    public int getCount() {
        return this.pets.size();
    }
    //添加宠物
    public void add(Pet pet) {
        if( pet != null ) {
            this.pets.add(pet);
        }
    }
    //打印所有宠物
    public void displayInfo() {
        Iterator<Pet> ite = this.pets.iterator();
        while( ite.hasNext() ) {
            System.out.println( ite.next() );
        }
    }
}