http://www.phpddt.com/dhtml/338.html
java里面没有typeof，js有。
我终于实现了用反射机制编写的工厂模式。java反射在工厂模式可以体现。
包含产品接口类，具体产品实现类，工厂类，这三种不同的类型
http://wenku.baidu.com/view/8899ecfff705cc175527094d.html
http://wenku.baidu.com/view/8ceb39c52cc58bd63186bd87.html
http://blog.csdn.net/justinavril/article/details/2873664
http://bbs.csdn.net/topics/60429890
http://www.cnblogs.com/pricks/archive/2009/08/11/1543855.html
http://www.cnblogs.com/bingoidea/archive/2009/06/21/1507889.html
http://www.cnblogs.com/octobershiner/archive/2012/03/18/2404751.html
具体java代码三种实现如下：
1、接口实现
/**
*
*/
package factory.realize1; /**
* @author wangjian2
* 接口
*/
public interface Product {
public String getProductName(String type,int id);
}
package factory.realize1;
public class Route implements Product {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
@Override
public String getProductName(String type, int id) {
return "RouteNameupdate";
}
}
/**
*
*/
package factory.realize1; /**
* @author wangjian2
*
*/
public class Package implements Product { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } @Override
public String getProductName(String type, int id) {
return "PackageName";
} }
/**
*
*/
package factory.realize1; import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method; /**
* @author wangjian2
*
*/
public class Factory { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } public void getName(String type,int id){
if("跟团".equals(type)){
Product prd = new Route();
System.out.println(prd.getProductName("", 0));
}else if ("自助游".equals(type)){
Product prd = new Package();
System.out.println(prd.getProductName("", 0));
}
} /**
* 通过反射将参数传给函数并返回结果
* @param type
* @param id
*/
public void getNameByreflect(String type,int id){
Class<?> cls = null;
try {
//获取指定的任意type的所需类的完全限定名(包名+类名)相关联的class对象
cls = Class.forName("factory.realize1."+type);
//获取类对应的任意方法对象
Method getProductName = cls.getMethod("getProductName", new Class[]{String.class,int.class});
//使用该方法
Object result = getProductName.invoke(cls.newInstance(), new Object[]{new String(type),0});
System.out.println(result);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
*
*/
package factory.realize1; /**
* @author wangjian2
*
*/
public class TestExample { /**
* @param args
*/
public static void main(String[] args) {
Factory factory = new Factory();
factory.getName("跟团", 0);
//反射实现
factory.getNameByreflect("Route", 0);
} }
2、抽象类实现
/**
*
*/
package factory.realize2; /**
* @author wangjian2
* 抽象类
*/
public abstract class Product {
public abstract String getProductName(String type,int id);
}
package factory.realize2;
public class Route extends Product {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
@Override
public String getProductName(String type, int id) {
return "RouteNameupdate";
}
}
/**
*
*/
package factory.realize2; /**
* @author wangjian2
*
*/
public class Package extends Product { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } @Override
public String getProductName(String type, int id) {
return "PackageName";
} }
/**
*
*/
package factory.realize2; import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method; /**
* @author wangjian2
*
*/
public class Factory { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } public void getName(String type,int id){
if("跟团".equals(type)){
Product prd = new Route();
System.out.println(prd.getProductName("", 0));
}else if ("自助游".equals(type)){
Product prd = new Package();
System.out.println(prd.getProductName("", 0));
}
} /**
* 通过反射将参数传给函数并返回结果
* @param type
* @param id
*/
public void getNameByreflect(String type,int id){
Class<?> cls = null;
try {
cls = Class.forName("factory.realize1."+type);
Method getProductName = cls.getMethod("getProductName", new Class[]{String.class,int.class});
Object result = getProductName.invoke(cls.newInstance(), new Object[]{new String(type),0});
System.out.println(result);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
*
*/
package factory.realize2; /**
* @author wangjian2
*
*/
public class TestExample { /**
* @param args
*/
public static void main(String[] args) {
Factory factory = new Factory();
factory.getName("跟团", 0);
factory.getNameByreflect("Route", 0);
} }
3、继承类重写（覆盖）
/**
*
*/
package factory.realize3; /**
* @author wangjian2
* 继承类重写（覆盖）
*/
public class Product {
public String getProductName(String type,int id) {
return null;
}
}
package factory.realize3;
public class Route extends Product {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
@Override
public String getProductName(String type, int id) {
return "RouteNameupdate";
}
}
/**
*
*/
package factory.realize3; /**
* @author wangjian2
*
*/
public class Package extends Product { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } @Override
public String getProductName(String type, int id) {
return "PackageName";
} }
/**
*
*/
package factory.realize3; import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method; /**
* @author wangjian2
*
*/
public class Factory { /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub } public void getName(String type,int id){
if("跟团".equals(type)){
Product prd = new Route();
System.out.println(prd.getProductName("", 0));
}else if ("自助游".equals(type)){
Product prd = new Package();
System.out.println(prd.getProductName("", 0));
}
} /**
* 通过反射将参数传给函数并返回结果
* @param type
* @param id
*/
public void getNameByreflect(String type,int id){
Class<?> cls = null;
try {
cls = Class.forName("factory.realize1."+type);
Method getProductName = cls.getMethod("getProductName", new Class[]{String.class,int.class});
Object result = getProductName.invoke(cls.newInstance(), new Object[]{new String(type),0});
System.out.println(result);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
*
*/
package factory.realize3; /**
* @author wangjian2
*
*/
public class TestExample { /**
* @param args
*/
public static void main(String[] args) {
Factory factory = new Factory();
factory.getName("跟团", 0);
factory.getNameByreflect("Route", 0); } }
个人理解反射机制是为了开发者方便，减少开发量。
http://www.cnblogs.com/rollenholt/archive/2011/09/02/2163758.html
java反射在工厂模式可以体现
http://blog.csdn.net/ritterliu/article/details/7764849