静态工厂：工厂初始化之前，工厂中的类已经被实例化放在工厂容器中

public class StaticFactory { public static void main(String[] args) { Object bean = StaticFactory.getBean(); } public static Object getBean(){ return new Object(); }}

实例工厂：工厂在构造方法初始化时,会将类进行实例化放在工厂中

class InstanceFactory { public static void main(String[] args) { InstanceFactory factory = new InstanceFactory(); Object bean = factory.getBean(); } public Object getBean(){ return new Object(); }}