每天一整理-java设计模式之工厂模式模式

工厂模式是我们很常用的一个模式，在ssh框架和ssm框架中都普遍使用到的工厂模式

工厂模式的定义一个用于创建对象的接口，让子类决定实例化哪个类

在这里我主要讲通过反射机制来决定生成类的工厂实现方法

产品抽象类productpackage singleinstance;

public abstract class Product {
public abstract void method();

}
//产品A
package singleinstance;

public class ProductA extends Product {

@Override
public void method() {
// TODO Auto-generated method stub
System.out.println("product A");

}

}

//产品B

package singleinstance;

public class ProductB extends Product{

@Override
public void method() {
// TODO Auto-generated method stub
System.out.println("productB");

}

}

//工厂抽象类

package singleinstance;

public abstract class Factory {
//抽象类具体生成由子类实现
public abstract<T extends Product> T createProcuct(Class<T> clz);

}

package singleinstance;

public abstract class Factory {
//抽象类具体生成由子类实现
public abstract<T extends Product> T createProcuct(Class<T> clz);

}

//产品实现类

package singleinstance;

public class ConcreteFactory extends Factory{

@Override
public <T extends Product> T createProcuct(Class<T> clz) {
// TODO Auto-generated method stub
Product p =null;
try {
p=(Product) Class.forName(clz.getName()).newInstance();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (T) p;
}

}

//具体工厂类

package singleinstance; public class ConcreteFactory extends Factory{ @Override public <T extends Product> T createProcuct(Class<T> clz) { // TODO Auto-generated method stub Product p =null; try { p=(Product) Class.forName(clz.getName()).newInstance(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return (T) p; } }