1.简单工厂模式（用的最多）
优点没：没必要知道那么多接口的实现了，只需要知道工厂，生成的对象我们只需要知道知道接口
缺点：不修改代码无法拓展实现类，拓展性较差
public interface Car {
}
public class Audi implements Car {
}
public class Bwm implements Car {
}
//简单工厂:可拓展性差,每增加一个车型，都需要在这其中加入else if
public class CarFactory {
public static Car createCar(String str) {
if(str=="audi") {
return new Audi();
}else if(str=="bwm") {
return new Bwm();
}
return null;
}
}
public class Client {
public static void main(String[] args) {
System.out.println(CarFactory.createCar("audi"));
}
}
2.工厂方法模式
优点：较简单工厂可拓展性较好
缺点：较简单工厂需要知道的工厂较多，结构较简单工厂复杂，随着工厂类的增加，类越来越多
public interface Car {
}
public class Audi implements Car {
}
public class Bwm implements Car {
}
public interface Factory {
}
public class AudiFactory implements Factory{
public static Car createCar() {
return new Audi();
}
}
public class BwmFactory implements Factory {
public static Car createCar() {
return new Bwm();
}
}
public class Client {
public static void main(String[] args) {
Car audi = AudiFactory.createCar();
}
}
3.抽象工厂模式
优点：用来生产不同产品族的全部产品；支持增加产品族
缺点：对于增加新的产品，无能为力；支持增加产品族
public interface Engine {
}
public class LowEngine implements Engine{
}
public class LuxuryEngine implements Engine{
}
public interface Factory {
}
public class LowFactory implements Factory{
public static Engine createEngine() {
return new LowEngine();
}
}
public class LuxuryFactory implements Factory{
public static Engine createEngine() {
return new LuxuryEngine();
}
}
原文：https://www.cnblogs.com/gg128/p/9550615.html