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设计模式之 工厂模式

2015-08-14 16:16 309 查看
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package
Reflect;


interface
fruit{

public
 
abstract
 
void
 
eat();

}


class
 
Apple
implements
 
fruit{

public
 
void
 
eat(){

System.out.println(
"Apple"
);

}

}


class
 
Orange
implements
 
fruit{

public
 
void
 
eat(){

System.out.println(
"Orange"
);

}

}


class
 
Factory{

public
 
static
 
fruit
getInstance(String ClassName){

fruit f=
null
;

try
{

f=(fruit)Class.forName(ClassName).newInstance();

}
catch
 
(Exception e) {

e.printStackTrace();

}

return
 
f;

}

}

class
 
hello{

public
 
static
 
void
 
main(String[]
a){

fruit f=Factory.getInstance(
"Reflect.Apple"
);

if
(f!=
null
){

f.eat();

}

}

}


现在就算我们添加任意多个子类的时候，工厂类就不需要修改。

2
apple=Reflect.Apple

orange=Reflect.Orange


　然后编写主类代码：

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package
 
Reflect;


import
 
java.io.*;

import
 
java.util.*;


interface
 
fruit{

public
 
abstract
 
void
 
eat();

}


class
 
Apple
implements
 
fruit{

public
 
void
 
eat(){

System.out.println(
"Apple"
);

}

}


class
 
Orange
implements
 
fruit{

public
 
void
 
eat(){

System.out.println(
"Orange"
);

}

}


//操作属性文件类

class
 
init{

public
 
static
 
Properties
getPro()
throws
 
FileNotFoundException,IOException{

Properties pro=
new
 
Properties();

File f=
new
 
File(
"fruit.properties"
);

if
(f.exists()){

pro.load(
new
 
FileInputStream(f));

}
else
{

pro.setProperty(
"apple"
,
"Reflect.Apple"
);

pro.setProperty(
"orange"
,
"Reflect.Orange"
);

pro.store(
new
 
FileOutputStream(f),
"FRUIT
CLASS"
);

}

return
 
pro;

}

}


class
 
Factory{

public
 
static
 
fruit
getInstance(String ClassName){

fruit f=
null
;

try
{

f=(fruit)Class.forName(ClassName).newInstance();

}
catch
 
(Exception
e) {

e.printStackTrace();

}

return
 
f;

}

}

class
 
hello{

public
 
static
 
void
 
main(String[]
a)
throws
 
FileNotFoundException,IOException{

Properties pro=init.getPro();

fruit f=Factory.getInstance(pro.getProperty(
"apple"
));

if
(f!=
null
){

f.eat();

}

}

}


【运行结果】：Apple
                                            

                                        

                        
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