基本设计模式05-一般工厂模式

       一般工厂模式用的比较广，在Java中尤为常见，因为相对比较简单，所以使用场景比较广泛；
       springboot在整合RabbitMQ，创建EXCHANGE的代码，QUEUE的代码等都能看到。
　　如下，是创建EXCHANGE的过程，通过建造器，传入类型，根据类型进行对象创建：

    public <T extends Exchange> T build() {
        AbstractExchange exchange;
        if (ExchangeTypes.DIRECT.equals(this.type)) {
            exchange = new DirectExchange(this.name, this.durable, this.autoDelete, getArguments());
        }
        else if (ExchangeTypes.TOPIC.equals(this.type)) {
            exchange = new TopicExchange(this.name, this.durable, this.autoDelete, getArguments());
        }
        else if (ExchangeTypes.FANOUT.equals(this.type)) {
            exchange = new FanoutExchange(this.name, this.durable, this.autoDelete, getArguments());
        }
        else if (ExchangeTypes.HEADERS.equals(this.type)) {
            exchange = new HeadersExchange(this.name, this.durable, this.autoDelete, getArguments());
        }
        else {
            exchange = new CustomExchange(this.name, this.type, this.durable, this.autoDelete, getArguments());
        }
      }
 

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来源： https://www.cnblogs.com/perferect/p/12981852.html