本文只讲解常用的设计模式,有的不太好理解,文章需要慢慢读 代理模式 概念 Proxy(代理)模式是常见设计模式之一,“代理”顾名思义就是“替代”的意思,很容易理解。根据GoF(《Design Patterns: Elements of Reusable Object-Oriented Software》的四位作者)的代理设计模式意图是:Provide a surrogate or placehol
官方文档-AtomicReference public class AtomicReference extends Object implements Serializable An object reference that may be updated atomically. See the java.util.concurrent.atomic package specification f
DBMS supports object-oriented data. It ensures direct correspondence between real-world objects and their representations in the database. This correspondence ensures that objects retain their integri
After an object has been used, it is deallocated from the memory using the Garbage Collector class. The objects are destroyed based on the fact that no reference to that object is present. The Garbage
Java is a dynamic, secured and class based high level object oriented programming language developed by Oracle Corporation. On the other hand; C# is a .Net Framework object oriented programming langua
1、CREATE TABLE TEST1 PARALLEL 8 AS SELECT T1.OBJECT_ID,T2.OWNER FROM T1,T2 WHERE T1.OBJECT_ID = T2.OBJECT_ID; 2、CREATE TABLE TEST3 AS SELECT /*+PARALLEL 8 */T1.OBJECT_ID,T2.OWNER FROM T1,T2 WHERE T1.O