什么是Java（合集）

待我称王封你为后i 2024-03-22 15:07 76阅读 0赞

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Java is one of the hyped-up Internet software technologies that have spawned the World Wide Web, awfulwords like intranet, and those strange-looking addresses on business cards and TV commercials. Originallyknown as a way to jazz up Web pages with graphic animations -- stock tickers that crawl across your screen,for example, and dancing icons -- Java has quickly evolved into a whole lot more. To Microsoft''s dismay, itis fast becoming what is known as a computing platform -- a sturdy base upon which programmers can buildsoftware applications.

Java is making possible the rapid development of versatile programs for communicating and collaboratingon the Internet. We''re not just talking word processors and spreadsheets here, but also applications tohandle sales, customer service, accounting, databases, and human resources -- the meat and potatoes ofcorporate computing. Java is also making possible a controversial new class of cheap machines called networkcomputers, or NCs, which Sun, IBM, Oracle, Apple, and others hope will proliferate in corporations and ourhomes.

The way Java works is simple. Unlike ordinary software applications, which take up megabytes on the harddisk of your PC, Java applications, or applets, are little programs that reside on the network incentralized servers. The network delivers them to your machine only when you need them; because the appletsare so much smaller than conventional programs, they don''t take forever to download.

Say you want to check out the sales results from the Southwest region. You''ll use your Internet browserto find the corporate intranet Website that dishes up financial data and, with a mouse click or two, ask forthe numbers. The server will zap you not only the data, but also the sales-analysis applet you need todisplay it. The numbers will pop up on your screen in a Java spreadsheet, so you can noodle around with themimmediately rather than hassle with importing them to your own spreadsheet program.

To graph the numbers, you''ll call in a charting applet that will let you print out your report nice andpretty, all without leaving your browser. And you''ll always get the latest, greatest version of the appletstoo: Since the software is stored in only one place, corporate technicians can keep it up to data moreeasily.

The real beauty of the Java language, however, is its power to save users money, because it vastlysimplifies creating and deploying applications and because it lets them keep their existing legacycomputers and software. Java programs, once written, can run without modification on just about any kind ofcomputer: a PC, a Macintosh, a UNIX workstation -- heck, even a mainframe. The underlying operating systemmakes no difference. Java actually can breathe new life into older specialized computers that were at riskof becoming obsolete.

In scarcely a year, Java has evolved into a major challenger to Microsoft''s Windows family of PCoperating systems -- faster even than DOS and Windows rose to challenge traditional mainframes andminicomputers. Java is also well on its way to becoming the most important Internet software standard,catapulting Sun past Netscape and Microsoft as the leader in Internet computing.

Java是灸手可热的Internet软件技术中的一种，而这些技术孕育了World Wide Web、内部网一类令人生畏的词儿以及名片上和电视广告中那些怪模怪样的地址。最初，它是以一种利用图形动画来活跃Web页面的一种方法闻名，例如，股票报价从屏幕上慢慢移动和跳跃的图标，Java很快全面介入。令微软公司惊愕的是，它很快成了一种被称作计算平台的东西--一个能让程序员开发应用软件的坚实基础。

Java正在使快速开发Internet上通信与协同工作的通用程序成为可能。这里，我们不仅是谈论字处理、电子数据表，而且是能够处理销售、客户服务、记帐、数据库和人事资源管理的应用程序--它们是公司计算的基础。Java也使争论中的一类新的称之为网络计算机(即PC)的便宜计算机成为可能，SUN、IBM、Oracle、Apple和其它公司希望这种计算机将在公司和家庭中普及开来。

Java工作的方法简单。与那些要占用PC机硬盘多兆字节的普通应用软件不一样，Java应用程序，即小应用程序，是很小的程序，它常驻在网络中集中式的服务器上。只有当你需要这种应用程序时，网络才把它们送到你的机器上;由于小应用程序比常规程序小得多，故下载不需很多时间。

比方说，你要检查一下西南地区的销售结果。利用Internet浏览器找到能提交财务数据的公司内部网Web点，再用鼠标器点击一下或两下，便可调这些数字。服务器将不仅快速给你数据，而且给出显示它所需的销售分析小应用程序。这些数字在Java数据表中将浮现到你的屏幕上，因而你能即兴地使用它们，而不是麻烦地把它们调入你自己的数据表程序中。为用图形表示这些数字，你可以调入作图表的小应用程序，让你漂漂亮亮地打印出报表来，而所有这些不必离开浏览器。你也能得到最新最好的小应用于程序版本：因为这种软件只存储在一个地方，公司的技术人员可较容易地使其保持最新。

然而，Java语言的真正优点是具有让用户省钱和省力，因为它大大简化了应用程序的开发与部署使用，而且让它们保留已有的传统计算机和软件。Java程序一旦写好了，就能在任何一种计算机(PC机、Macintosh机、Unix工作站甚至是大型机)上无须修改就能运行。基本的操作系统是没有差别的。Java实际上给予了那些较旧的专用计算机(有变成废品风险的产品)新的生命。

在不到一年的时间内，Java已成了微软的PC操作系统Windows系列的主要挑战者，比DOS和Windows挑战传统的大型机和小型机的速度还要快。Java也在成为最重要的Internet软件标准的道路上迅跑，使Sun超过Netscape和微软成为Internet计算的领袖。

**java英文自我介绍3篇**

**java英文自我介绍篇一：**

Good morning !

It is really my honor to have this opportunity for a interview, I hope i can make a good performance today. I'm confident that I cansucceed. Now i will introduce myself briefly

I am 24 years old,born in Jiangxi province .

I was graduated from University of Science and Technology of China university. my major is Software Engineer.and I will get my master degree after my graduation in the year of 2021. I spend most of my time on study,i have passed CET4 . and i have acquired basic knowledge of my major during my school time.

In July 2021, I begin work for ...as a java engineer in suzhou city.Because I'm capable of more responsibilities, so I decided to change my job. Because I want to change my working environment, I'd like to find a job which is more challenging.

Morover \*\* is a global company, so I feel I can gain the most from working in this kind of company ennvironment. That is the reason why I come here to compete for this position.

I think I'm a good team player and I'm a person of great honesty to others. Also I am able to work under great pressure.

That's all. Thank you for giving me the chance

**java英文自我介绍篇二：**

My name is long right This year 21 years old, hubei huanggang, graduated from wuhan vocational and technical college in 2012, 6 month. To learn major is software technology, the main study direction of Java enterprise application development and management.

Before locking in wuhan software technology co., LTD., internship, worked as a Java programmer in the company after graduation, mainly engaged in the development of Java project related modules, able to skillfully use of Java technology, familiar with the Jsp, Servlet, Jdbc, and common framework spring, Struts, Hibernate and front-end technology: jS, jquery, and ORACLE database, essentially.

To Exitjs and UML has a certain foundation. My plan is: within five years work in the Java development, accumulation of industry experience and technology, and contacts. And self-study English, English grade card, I believe that as long as I want to do, will do it. Come to Shanghai, I hope to find a good job, hope your company can give me a chance to show their ability, thank you! I applaud this viewpoint, this year 21 years old, graduated from xx PLA information engineering university computer science and technology, has a solid core Java based, good programming style; Familiar with web development of JSP + servlet + javabean pattern; Familiar with struts, hibernate, spring and other open source framework, understand the ejb; Familiar with tomcat, jboss server, etc., familiar with software development based on Linux and Unix environment.

During the period of school has repeatedly social practice experience, online virtual laboratory of the college have been involved in the development of requirement analysis, several times as much during the university course lesson representative.

Although the actual work experience is not very enough, but the point four years has trained my full confidence and professionalism and solid academic foundation knowledge and strong professional skills. Four years in military school life, I am strict with myself, consciously, disciplined, punctual. I am honest and have sense of responsibility, has the nature of independence and progress, start work diligently, is good at the brain, strong ability to adapt to the new environment. Can in the shortest possible time to complete the transition from student to professional staff, do your best to blend in the new work life.

**java英文自我介绍篇三：**

hello! I come from XXX university, is a fresh graduate, major is computer application technology, during the period of school I attended many after school work, involved in multiple application system development and design, familiar with Java development tools and application of various of system development methods. During the period of study and work, summarizes the implementation and practice of the various technical means, there are a few small accumulation. Has recently graduated, to see your company's recruitment information, the technology and the ability to feel is very appropriate, will submit a resume. Hope can have you this,

**经典Java基础面试题**

1、如果main方法被声明为private会怎样?

能正常编译，但运行的时候会提示”main方法不是public的”。

2、Java里的传引用和传值的区别是什么?

传引用是指传递的是地址而不是值本身，传值则是传递值的一份拷贝。

3、如果要重写一个对象的equals方法，还要考虑什么?

hashCode。

4、Java的”一次编写，处处运行”是如何实现的?

Java程序会被编译成字节码组成的class文件，这些字节码可以运行在任何平台，因此Java是平台的独立。

5、说明一下public static void main(String args\[\])这段声明里每个关键字的作用。

public: main方法是Java程序运行时调用的第一个方法，因此它必须对Java环境可见。所以可见性设置为pulic.

static: Java平台调用这个方法时不会创建这个类的一个实例，因此这个方法必须声明为static。

void: main方法没有返回值。

String是命令行传进参数的类型，args是指命令行传进的字符串数组。

6、==与equals的区别

==比较两个对象在内存里是不是同一个对象，就是说在内存里的存储位置一致。两个String对象存储的值是一样的，但有可能在内存里存储在不同的地方。

==比较的是引用而equals方法比较的是内容。public boolean equals(Object obj)

这个方法是由Object对象提供的，可以由子类进行重写。默认的实现只有当对象和自身进行比较时才会返回true,这个时候和==是等价的。String,

BitSet, Date, 和File都对equals方法进行了重写，对两个String对象

而言，值相等意味着它们包含同样的字符序列。对于基本类型的包装类来说，值相等意味着对应的基本类型的值一样。

7、如果去掉了main方法的static修饰符会怎样?

程序能正常编译。运行时会抛NoSuchMethodError异常。

8、为什么oracle type4驱动被称作瘦驱动?

oracle提供了一个type 4

JDBC驱动，被称为瘦驱动。这个驱动包含了一个oracle自己完全用Java实现的一个TCP/IP的Net8的实现，因此它是平台的独立，可以在运行时由浏览器下载，不依赖任何客户端

的oracle实现。客户端连接字符串用的是TCP/IP的地址端口，而不是数据库名的tnsname。

9、介绍一下finalize方法

final: 常量声明。 finally: 处理异常。 finalize: 帮助进行垃圾回收。

接口里声明的变量默认是final的。final类无法继承，也就是没有子类。这么做是出于基础类型的安全考虑，比如String和Integer。这样也使得编译器进行一些优化，更容易保证线程的安全性。final方法无法重写。final变量的值不能改变。finalize()方法在一个对象被销毁和回收前会被调用。finally,通常用于异常处理，不管有没有异常被抛出都会执行到。比如，关闭连接通常放到finally块中完成。

10、什么是Java API?

Java API是大量软件组件的集合，它们提供了大量有用的功能，比如GUI组件。

**面试自我介绍范文**

我叫--，今年--岁。----年月我从----学校----专业毕业。回想起那段时光真是既甜蜜又完美。

我家共有--，----，为了照顾父母，我一向留在他们身边。我曾--，先是--，后又--。但不论----，当一名----始终是我心向往之并愿倾尽毕生心血去追求的事业。我曾多次参加考试，但都由于各种原因而未能实现梦想，但我暗下决心，只要有机会，我就一向考下去，直到理想实现为止。

如今的我，历经生活的考验，比起我的竞争对手在年龄上我已不再有优势，但是我比他们更多了一份耐心和职责心，更多了一份成熟和自信。

\--这个职业是神圣而伟大的，他要求--不仅仅要有丰富的知识，还要有高尚的情操。因此，在读--时，我就十分注重自身的全面发展，广泛地培养自己的兴趣爱好，并学有专长，在注重知识学习的同时我还注意培养自己高尚的道德情操，自觉遵纪守法，遵守社会公德，没有不良嗜好和行为。我想这些都是一名--工作者就应具备的最起码的素养。

假如，我通过了面试，成为众多--队伍中的成员，我将不断努力学习，努力工作，实现更大的抱负。谢谢!

**面试注意事项**

善于总结和分析问题本质。再举个例子，hr问你专业学了哪些内容啊?我的回答是我的专业是面向企业管理/经济学科的会计审计工作，主要是保证会计基础在正常工作中的使用和统计、概率分析等一些分析和整理数据基本方法的学科。

ps:这样的回答无疑是出彩的，也更加具有应变性。切记不要照本宣科的说我学了--、--、--学科，我又在大学或工作之余考到了四六级证书和会计证，我坚信这种回答方式就太应试教育了。

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