Factory Method

Simple Factory:

以Fruit为例，以下是实现代码：

Fruit.java

 

package com.flyingh.iproduct;

public interface Fruit {
	
}

 

 Apple.java

 

package com.flyingh.product;

import com.flyingh.iproduct.Fruit;

public class Apple implements Fruit {

}

 

 Orange.java

 

package com.flyingh.product;

import com.flyingh.iproduct.Fruit;

public class Orange implements Fruit {

}

 

 Pear.java

 

package com.flyingh.product;

import com.flyingh.iproduct.Fruit;

public class Pear implements Fruit {

}

 

 FruitFactory.java

 

package com.flyingh.factory;

import com.flyingh.iproduct.Fruit;
import com.flyingh.product.Apple;
import com.flyingh.product.Orange;
import com.flyingh.product.Pear;

public class FruitFactory {
	// public static Fruit getFruitInstance() {
	// return new Apple();
	// }

	public static Fruit getFruitInstance(String str) {
		if ("apple".equalsIgnoreCase(str)) {
			return new Apple();
		} else if ("orange".equalsIgnoreCase(str)) {
			return new Orange();
		} else if ("pear".equalsIgnoreCase(str)) {
			return new Pear();
		} else {
			throw new RuntimeException("参数有误");
		}
	}
}

 

 Client.java

 

package com.flyingh.client;

import com.flyingh.factory.FruitFactory;
import com.flyingh.iproduct.Fruit;
import com.flyingh.product.Apple;
import com.flyingh.product.Orange;

public class Client {
	public static void main(String[] args) {
		Fruit fruit = FruitFactory.getFruitInstance("orange");
		System.out.println(fruit instanceof Orange);// true
		System.out.println(fruit instanceof Apple);// false
		fruit = FruitFactory.getFruitInstance("banana");
		// java.lang.RuntimeException:参数有误
	}
}

 

 Factory Method:

以Cpu为例，代码如下：

CPU.java

 

package com.flyingh.icpu;

public interface CPU {
	String info();
}

 

 AMD.java

 

package com.flyingh.cpu;

import com.flyingh.icpu.CPU;

public class AMD implements CPU {

	@Override
	public String info() {
		// TODO Auto-generated method stub
		return "AMD";
	}

}

 

 Intel.java

 

package com.flyingh.cpu;

import com.flyingh.icpu.CPU;

public class Intel implements CPU {

	@Override
	public String info() {
		// TODO Auto-generated method stub
		return "Intel";
	}

}

 

 Factory.java

 

package com.flyingh.ifactory;

import com.flyingh.icpu.CPU;

public interface Factory {
	CPU createCPU();
}

 

 AMDFactory.java

 

package com.flyingh.factory;

import com.flyingh.cpu.AMD;
import com.flyingh.icpu.CPU;
import com.flyingh.ifactory.Factory;

public class AMDFactory implements Factory {

	@Override
	public CPU createCPU() {
		// TODO Auto-generated method stub
		return new AMD();
	}

}

 

IntelFactory.java

package com.flyingh.factory;

import com.flyingh.cpu.Intel;
import com.flyingh.icpu.CPU;
import com.flyingh.ifactory.Factory;

public class IntelFactory implements Factory {

	@Override
	public CPU createCPU() {
		// TODO Auto-generated method stub
		return new Intel();
	}

} 

  Client.java

 

package com.flyingh.client;

import com.flyingh.factory.AMDFactory;
import com.flyingh.factory.IntelFactory;
import com.flyingh.icpu.CPU;
import com.flyingh.ifactory.Factory;

public class Client {
	public static void main(String[] args) {
		Factory factory1 = new IntelFactory();
		Factory factory2 = new AMDFactory();
		CPU intel = factory1.createCPU();
		CPU amd = factory2.createCPU();
		System.out.println(intel.info());// Intel
		System.out.println(amd.info());// AMD
	}
}