~~~ public interface Car { void run(); } ~~~ ~~~ public class BM implements Car{ @Override public void run() { System.out.println("i am baoma"); } } ~~~ ~~~ public class Benci implements Car { @Override public void run() { System.out.println("i am benci"); } } ~~~ ~~~ public class CarFactory { public static Car createCare(String name){ if (name.equals("bm")){ return new BM(); } if (name.equals("benci")){ return new Benci(); } return null; } } ~~~ ~~~ Car bm = CarFactory.createCare("bm"); bm.run(); Car benci = CarFactory.createCare("benci"); benci.run(); ~~~ ### 優缺點 ``` 1. 可以根據外界給定的信息，決定創建那個具體類的對象，有利于整個軟件體系結構的優化 2. 包含所有實例的創建邏輯，違反高內聚的責任分配原則 ```