mayongbo19的博客

在项目中的具体应用抽象类public abstract class TemplateWriter<T> implements ItemWriter<T> { protected static final Logger logger = LoggerFactory.getLogger(TemplateWriter.class); @Overri...

要点:1.构造器私有化 2.创建的实例私有化 3.暴露一个公共的取得实例的方法1.懒汉式,单例模式,线程不安全public class Singleton { private static Singleton instance=null; private Singleton(){ } public static Singleton getIn...

}抽象产品类public abstract class Product {//产品类的公共方法public void method1(){//业务逻辑处理}//抽象方法public abstract void method2();}具体产品类public class ConcreteProduct1 extends Product {public void me...