package factory_pattern;
public abstract class Worker {
public abstract void work();
public abstract void eat();
}
package factory_pattern;
public class SuperWorker extends Worker {
public void work() {
System.out.println("Work hard and efficient.");
}
public void eat() {
System.out.println("Eat nutritional food.");
}
}
package factory_pattern;
public class CommonWorker extends Worker {
public void work() {
System.out.println("Work hard.");
}
public void eat() {
System.out.println("Eat food.");
}
}
package factory_pattern;
public interface IFactory {
public Worker CreateWorker();
}
package factory_pattern;
public class SuperFactory implements IFactory {
public Worker CreateWorker() {
return new SuperWorker();
}
}
package factory_pattern;
public class CommonFactory implements IFactory {
public Worker CreateWorker() {
return new CommonWorker();
}
}
package factory_pattern;
public class Main {
public static void main(String args[]) {
// IFactory factory = new CommonFactory();
IFactory factory = new SuperFactory();
Worker sam = factory.CreateWorker();
sam.eat();
sam.work();
}
}
/***
* If we want to understand the factory_pattern,we have to talk a lot
* about the simple_factory_pattern so that realize the "no simple" of
* the factory_pattern.
* As we have known that the simple_factory encapsulates the sentence of
* "switch-case",which works with object'polymorphisim,making the client
* gets what they need through giving the simple_factory different parameters.
* By comparison,the factory_pattern gets further abstraction in the aspect of
* different factory's implementation.The advantage is leave the "switch-case"
* out.The only thing we need to do is to choice the different concrete factories
* for changing different concrete objects.The relation between concrete factory
* and concrete object is one-to-one,which also means there so many concrete
* factories we have to construct.So we can concluded the feature that
* factory_pattern is the factory'spolymorphism.
*/
This is a general introduction to the 23 design patterns：
https://blog.csdn.net/GZHarryAnonymous/article/details/81567214