概述
用模板方法来构建生成实例的工厂， 这就是工厂方法模式
类图
Product
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| package com.example.factory.framework;
public abstract class Product {
public abstract void use();
}
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Factory
只要是工厂方法模式, 在生成实例时就一定会使用到模板方法模式
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| package com.example.factory.framework;
public abstract class Factory {
public final Product create(String owner) {
Product p = createProduct(owner);
registerProduct(p);
return p;
}
protected abstract void registerProduct(Product p);
protected abstract Product createProduct(String owner);
}
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IDCard
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| package com.example.factory.idcard;
import com.example.factory.framework.Product;
public class IDCard extends Product {
private String owner;
public IDCard(String owner) {
System.out.println("制作" + owner + "的ID卡。");
this.owner = owner;
}
@Override
public void use() {
System.out.println("使用" + owner + "的ID卡。");
}
public String getOwner() {
return owner;
}
}
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IDCardFactory
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| package com.example.factory.idcard;
import com.example.factory.framework.Factory;
import com.example.factory.framework.Product;
import java.util.ArrayList;
import java.util.List;
public class IDCardFactory extends Factory {
private List owners = new ArrayList();
@Override
protected void registerProduct(Product p) {
owners.add(((IDCard)p).getOwner());
}
@Override
protected Product createProduct(String owner) {
return new IDCard(owner);
}
public List getOwners() {
return owners;
}
}
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测试
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| package com.example.factory;
import com.example.factory.framework.Product;
import com.example.factory.idcard.IDCardFactory;
public class FactoryDemo {
public static void main(String[] args) {
IDCardFactory factory = new IDCardFactory();
Product card1 = factory.create("张三");
Product card2 = factory.create("李四");
Product card3 = factory.create("王五");
card1.use();
card2.use();
card3.use();
}
}
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最后
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