简单工厂方法实现

简单工厂方法并不属于真正的设计模式

首先创建所有鸟类的祖先类

package com.simplyFactory;

public interface Bird {
	public void fly();
	public void sing();

}

创建两个实现类Eagle和Dove

package com.simplyFactory;

public class Eagle implements Bird {

	public void fly() {
		System.out.println("I am eagle, I can fly high");
	}

	public void sing() {
		System.out.println("I can sing loud");
	}
}

package com.simplyFactory;

public class Dove implements Bird {

	public void fly() {
		System.out.println("I am a dove, I can fly");
	}

	public void sing() {
		System.out.println("I am a dove , I can't sing");
	}

}

定义简单鸟类工厂SimpleBirdFactory

package com.simplyFactory;

public class SimpleBirdFactory {
	public static Bird createBird(String type) {
		Bird bird = null;
		
		if (type.equals("dove")) {
			bird = new Dove();
		} else if (type.equals("eagle")) {
			bird = new Eagle();
		}
		return bird;
	}

}

编写测试程序

package com.simplyFactory;

public class testFactory {

	public static void main(String[] args) {
				
		Bird dove = SimpleBirdFactory.createBird("dove");
		dove.fly();
		dove.sing();
		
		Bird eagle = SimpleBirdFactory.createBird("eagle");
		eagle.fly();
		eagle.sing();
		
	}
}

总结

1.工厂方法可以静态,也可以非静态,用静态的话不需要实例化一个工厂
2.简单工厂封装了具体实现