Java was released on May 23, 1995 as a cross-platform, object-oriented, robust programming language with an extensive library. It is widely used in areas such as web development, mobile development, enterprise software, big data, and cloud computing.
Java Release Date
Java is a popular object-oriented programming language that was released in Officially released on May 23, 1995.
Background and Development
Java was originally developed by Sun Microsystems and is now owned by Oracle. The language is intended as a cross-platform programming language that can run on any computer without the need for recompilation.
Key Features
Some of the key features of Java that make it a popular programming language include:
- Cross Platform: Java code can be compiled to platform-independent bytecode and can be run on any computer that supports the Java Virtual Machine.
- Object-oriented: Java is an object-oriented language based on concepts such as encapsulation, inheritance and polymorphism.
- Robustness: Java has built-in safety mechanisms such as automatic memory management and type safety, making it more robust.
- Extensive library: The Java standard library provides a large number of classes and methods for various tasks such as input/output, networking and graphics.
Impact and Applications
Since its release, Java has become a widely used programming language by businesses and individual developers. It is widely used in various fields, including:
- Web Development: Java is a popular choice for creating dynamic web applications, such as servlets and JavaServer Pages (JSP).
- Mobile Development: The Android operating system is built with Java, making it ideal for mobile development.
- Enterprise Software: Java is used to develop various enterprise software applications such as CRM, ERP and databases.
- Big Data and Cloud Computing: Java is widely used in big data processing and cloud computing platforms.
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oracle asm指的是“自动存储管理”,是一种卷管理器,可自动管理磁盘组并提供有效的数据冗余功能;它是做为单独的Oracle实例实施和部署。asm的优势:1、配置简单、可最大化推动数据库合并的存储资源利用;2、支持BIGFILE文件等。

在oracle中,可以利用“TO_SINGLE_BYTE(String)”将全角转换为半角;“TO_SINGLE_BYTE”函数可以将参数中所有多字节字符都替换为等价的单字节字符,只有当数据库字符集同时包含多字节和单字节字符的时候有效。

在Oracle中,可利用lsnrctl命令查询端口号,该命令是Oracle的监听命令;在启动、关闭或重启oracle监听器之前可使用该命令检查oracle监听器的状态,语法为“lsnrctl status”,结果PORT后的内容就是端口号。

在oracle中,可以利用“drop sequence sequence名”来删除sequence;sequence是自动增加数字序列的意思,也就是序列号,序列号自动增加不能重置,因此需要利用drop sequence语句来删除序列。

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方法:1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数;2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。


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