在Factory Method模式中，父类决定实例的生成方式，但并不决定所要生成的具体的类，具体的处理全部交给子类负责，这样就可以将生成实例的框架和实际负责生成实例的类解耦
Factory Method模式UML
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Factory
public abstract class Factory {
public final Product create(String owner) {
Product p = createProduct(owner);
registerProduct(p);
return p;
}
protected abstract Product createProduct(String owner);
protected abstract void registerProduct(Product product);
}
IDCardFactory
public class IDCardFactory extends Factory {
private List owners = new ArrayList();
@Override
protected Product createProduct(String owner) {
return new IDCard(owner);
}
@Override
protected void registerProduct(Product product) {
owners.add(((IDCard)product).getOwner());
}
}
Product
public abstract class Product {
public abstract void use();
}
IDCard
public class IDCard extends Product {
private String owner;
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;
}
}
Main
public class Main {
public static void main(String[] args) {
// write your code here
Factory factory = new IDCardFactory();
Product card1 = factory.create("小明");
Product card2 = factory.create("小红");
card1.use();
card2.use();
System.out.println();
}
}
