15.7类的生命周期&&15.8工厂设计模式(血干JAVA系类)

• 15.7类的生命周期
• 15.8工厂设计模式
• • 15.8.1将反射应用在工厂模式上
  • 15.8.2结合属性文件的工厂模式
  • • • 【例15.29］属性操作类
      • 【例15.30】测试程序

package file;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

interface Fruit
{
	public void eat();
}
class Apple implements Fruit
{
	public void eat()
	{
		System.out.println("吃苹果");
	}
}
class Orange implements Fruit
{
	public void eat() 
	{
		System.out.println("吃橘子");
	}
}
class Factory
{
	public static Fruit getinstance(String path)
	{
		Fruit f = null;
		try 
		{
			f = (Fruit) Class.forName(path).newInstance();
		} 
		catch (Exception e) 
		{
			e.printStackTrace();
		}
		return f;
	}
}
public class demo 
{
	public static void main(String[] args) throws Exception
	{		
		Fruit f =Factory.getinstance("file.Apple");
		if(f!=null)
		{
			f.eat();
		}
	}
}

class Init
{
	public static Properties getProperties()
	{
		Properties pro = new Properties();
		File f = new File("d:"+File.separator+"fruit.properties");
		try 
		{
			if(f.exists())
			{
				pro.load(new FileInputStream(f));
			}
			else
			{
				pro.setProperty("apple", "file.Apple");
				pro.setProperty("orange", "file.Orange");
				pro.store(new FileOutputStream(f), "不存在文件，store的");
			}
		}
		catch (Exception e) 
		{
			e.printStackTrace();
		}
		return pro;
	}
}
public class demo 
{
	public static void main(String[] args) throws Exception
	{		
		Properties pro = Init.getProperties();
		Fruit f =Factory.getinstance(pro.getProperty("orange"));
		if(f!=null)
		{
			f.eat();
		}
	}
}