Java實驗項目三——寵物商店

Program：寵物商店的設計（繼承，接口，線性線性表）

 

Description：本題未實現圖形用戶界面，項目結構描述如下：

 

classes.Pet：定義寵物接口，只要實現該接口的寵物類，都可存儲進寵物商店

　　　　　　（本例定義的接口為標識接口，未定義任何方法，只用於標識）

 

classes.PetShop：寵物商店類,采用了單例設計模式

classes.entity.Dog：寵物狗類，實現了Pet接口

classes.entity.Cat：寵物貓類，實現了Pet接口

main.TestDemo：測試類

 

classes.Pet

 

/*
 * Description:定義寵物標識接口，只要是實現此接口的類都為寵物類，都可放進寵物商店
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * */


package classes;

public interface Pet {

}

 

classes.PetShop

 

/*
 * Description:定義寵物商店,采用單例設計模式
 * 
 * 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>();     //存取寵物
    private static PetShop instance = null;            //聲明私有對象
    
    //定義私有構造方法
    private PetShop() {    }
    
    //取得寵物商店的實例
    public static PetShop getInstance() {
        
        if( PetShop.instance == null ) {
            
            PetShop.instance = new PetShop();
        }
        return PetShop.instance;
    }
    
    //取得寵物的數量
    public int getCount() {
        
        return this.pets.size();
    }
    
    //添加寵物
    public void add(Pet pet) {
        
        if( pet != null ) {
            
            this.pets.add(pet);
        }
    }
    
    //打印所有寵物
    
    public void displayInfo() {
        
        Iterator<Pet> ite = this.pets.iterator();
        while( ite.hasNext() ) {
            
            System.out.println( ite.next() );
        }
    }
    
}

 

classes.entity.Dog

/*
 * Description:定義寵物狗類
 * 
 * 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;
    
    //定義構造方法
    
    public Dog() {}
    
    public Dog(String name, String color, int age) {
        
        super();
        this.name = name;
        this.color = color;
        this.age = age;
    }

    
    //定義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;
    }

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

}

 

classes.entity.Cat

/*
 * Description:定義寵物貓類
 * 
 * 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;
    
    //定義構造方法
    
    public Cat() {}
    
    public Cat(String name, String color, int age) {
        
        super();
        this.name = name;
        this.color = color;
        this.age = age;
    }

    
    //定義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;
    }

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

 

main.TestDemo

 

/*
 * Description:定義測試類，測試寵物商店
 * 
 * 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[]) {
        
        //取得寵物商店的實例
        PetShop shop = PetShop.getInstance();
        
        //添加寵物
        shop.add( new Dog("小黑","黑色",2) );
        shop.add( new Dog("小白","白色",3) );
        shop.add( new Cat("小喵","黃色",1) );
        shop.add( new Cat("大喵","白色",3) );
        
        //打印所有寵物
        shop.displayInfo();

    }        

}

 

/* * 
 * Description:定義寵物商店,采用單例設計模式 
 *
 * 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>();//存取寵物
    private static PetShop instance = null;//聲明私有對象
    //定義私有構造方法
    private PetShop() {}
    //取得寵物商店的實例
    public static PetShop getInstance() {
        if( PetShop.instance == null ) {
            PetShop.instance = new PetShop();
        }
        return PetShop.instance;
    }
    //取得寵物的數量
    public int getCount() {
        return this.pets.size();
    }
    //添加寵物
    public void add(Pet pet) {
        if( pet != null ) {
            this.pets.add(pet);
        }
    }
    //打印所有寵物
    public void displayInfo() {
        Iterator<Pet> ite = this.pets.iterator();
        while( ite.hasNext() ) {
            System.out.println( ite.next() );
        }
    }
}