Java实验项目三——简单工厂模式

 1 /*
 2  *Description:定义汽车接口 
 3  * */
 4 
 5 
 6 package entity;
 7 
 8 public interface Car {
 9 
10     public void printInfo();    //打印汽车信息
11 }

 1 /*
 2  * Description:定义奥迪类，并实现接口
 3  * 
 4  * */
 5 
 6 package entity;
 7 
 8 public class AoDi implements Car{
 9 
10     private String brand = "奥迪";        //品牌
11     private double price = 10000000;        //价格
12     
13     
14     public AoDi(){}
15     
16     public AoDi(String brand,double price) {
17         
18         this.brand = brand;
19         this.price = price;
20     }
21 
22     public String getBrand() {
23         return brand;
24     }
25 
26     public void setBrand(String brand) {
27         this.brand = brand;
28     }
29 
30     public double getPrice() {
31         return price;
32     }
33 
34     public void setPrice(double price) {
35         this.price = price;
36     }
37     
38     @Override
39     public String toString() {
40         return "AoDi [brand=" + brand + ", price=" + price + "]";
41     }
42 
43     public void printInfo() {            //实现接口方法
44         
45         System.out.println( "我是奥迪:" );
46         System.out.println( this.toString() );
47     }
48     
49     
50 }

 1 /*
 2  * Description:定义宝马类，实现接口
 3  * 
 4  * */
 5 
 6 package entity;
 7 
 8 public class BaoMa implements Car{
 9 
10     private String brand = "宝马";        //品牌
11     private double price = 1000000;        //价格
12     
13     public BaoMa(){}
14     
15     public BaoMa(String brand,double price) {
16         
17         this.brand = brand;
18         this.price = price;
19     }
20 
21     public String getBrand() {
22         return brand;
23     }
24 
25     public void setBrand(String brand) {
26         this.brand = brand;
27     }
28 
29     public double getPrice() {
30         return price;
31     }
32 
33     public void setPrice(double price) {
34         this.price = price;
35     }
36     
37     @Override
38     public String toString() {
39         return "Baoma [brand=" + brand + ", price=" + price + "]";
40     }
41 
42     public void printInfo() {            //实现接口方法
43         
44         System.out.println( "我是宝马:" );
45         System.out.println( this.toString() );
46     }
47     
48     
49 }

 1 /*
 2  * Description:定义大众类，并实现接口
 3  * 
 4  * */
 5 
 6 
 7 package entity;
 8 
 9 public class DaZhong implements Car{
10 
11     private String brand = "大众";        //品牌
12     private double price = 100000;        //价格
13     
14     
15     public DaZhong(){}
16     
17     public DaZhong(String brand,double price) {
18         
19         this.brand = brand;
20         this.price = price;
21     }
22 
23     public String getBrand() {
24         return brand;
25     }
26 
27     public void setBrand(String brand) {
28         this.brand = brand;
29     }
30 
31     public double getPrice() {
32         return price;
33     }
34 
35     public void setPrice(double price) {
36         this.price = price;
37     }
38     
39     @Override
40     public String toString() {        
41         return "DaZhong [brand=" + brand + ", price=" + price + "]";
42     }
43 
44     public void printInfo() {            //实现接口方法
45         
46         System.out.println( "我是大众:" );
47         System.out.println( this.toString() );
48     }
49     
50     
51 }

 1 /*
 2  * Description:该类完成属性文件的初始化
 3  * 
 4  * 
 5  * */
 6 
 7 package tools;
 8 import java.io.File;
 9 import java.io.FileInputStream;
10 import java.io.FileOutputStream;
11 import java.util.Properties;
12 
13 public class Init {
14 
15     public static Properties getProperty() {
16         
17         Properties pro = new Properties();        //声明对象
18 
19         //实例化File类对象
20         File file = new File( "D:" + File.separator + "init.properties" );
21         
22         try {
23             if( file.exists() ) {        //属性文件存在
24                 pro.load( new FileInputStream(file) );        //加载文件
25             }else {
26                 
27                 //文件不存在，编辑文件内容
28                 pro.setProperty("大众","entity.DaZhong" );
29                 pro.setProperty("宝马", "entity.BaoMa");
30                 pro.setProperty("奥迪", "entity.AoDi");
31 
32                 //进行存储
33                 pro.store(new FileOutputStream(file), "The information of the car");
34             }
35         }catch(Exception e) {
36             
37             e.printStackTrace();
38         }
39         
40         return pro;
41     }
42     
43 }

 1 /*
 2  * Description:定义工厂类，通过工厂模式，和反射机制的应用，取得实例化对象，并实例化接口对象，返回接口类型
 3  * 
 4  * 
 5  * */
 6 
 7 
 8 package tools;
 9 
10 import entity.Car;
11 
12 public class Factory {
13 
14     public static Car getInstance(String carName) {        //此处传递过来的参数是 包.类名
15         
16         Car car = null;
17         
18         try {
19             car = (Car)Class.forName(carName).newInstance();        //实例化对象
20             
21         }catch(Exception e) {
22             
23             e.printStackTrace();
24         }
25         return car;
26     }
27 }

 1 /*
 2  * Description:定义Operator类，取得用户的输入值
 3  * 
 4  * */
 5 
 6 package tools;
 7 import java.util.Scanner;
 8 
 9 public class Operate {
10 
11     public static String getInput() {
12         
13         Scanner scan = new Scanner(System.in);
14         String carName = "";
15         System.out.println( "用户输入车的名称：" );
16         carName = scan.next();
17         return carName;                //返回用户的输入值
18     }
19     
20 }

 1 /*
 2  * Description:类的接口的运用
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Writen:2017-09-25
 7  * 
 8  * 
 9  * */
10 /*
11  * Description:java反射机制，属性文件，实现工厂模式
12  * 
13  * Written By:Cai
14  * 
15  * Date Written:2017-09-24
16  * 
17  * 
18  * */
19 
20 
21 package main;
22 
23 import java.util.Properties;    //引入属性文件
24 import tools.Factory;            //引入自定义的类
25 import tools.Operate;
26 import entity.Car;
27 import tools.Init;
28 
29 public class DemoThree4 {
30     
31     public static void main(String args[]) {
32 
33         Car car = null;
34         String carName = Operate.getInput();            //取得用户的输入内容（此处没有加数据的合法验证）
35         Properties pro = Init.getProperty();            //数理化Properties对象
36         
37         car = Factory.getInstance( pro.getProperty(carName) );    //通过属性文件取得实例化对象，并实例化Car对象
38         car.printInfo();                    //调用被实例对象覆写的方法
39         
40     }
41 }