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java 异常处理

2023-08-01 20:06:11
TAG: ava ja java
共4条回复
cloud123

发生异常时不会抛出lockFailureException,只有当循环结束时才会抛出。

当循环内的return pjp.proceed();发生PessimisticLockingFailureException异常时,会被catch住并将该异常赋值给lockFailureException,然后如果循环结束,最后的throw lockFailureException会将该异常抛出到外层方法;

而如果return pjp.proceed();直到循环结束都没发生过异常,那lockFailureException就是null,最后也就抛出一个null,但这样也会对外层方法造成一些麻烦,比如外层方法必须对改方法所抛出的异常进行空指针验证。

皮皮

while(numAttempts <= this.maxRetries);//抛出的条件

throw lockFailureException;

如果没抛出,就不抛出,按正常的向下执行,本例是方法结束。

LuckySXyd

当代码执行到throw lockFailureException;这一句时,已经表明程序发生了异常,这一句仅仅是将这个异常跑出来罢了,因为正常情况下肯定从return pjp.proceed()函数返回。

小菜G

throw语句是直接抛出异常的意思。

当有发生异常时再抛出是try - catch

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2023-08-01 17:43:011

考研英语阅读理解和翻译

  The world is goingthrough the biggest wave of mergers and acquisitions ever witnessed. Theprocess sweeps from hyperactive America to Europe and reaches the emergingcountries with unsurpassed might. Many in these countries are looking at thisprocess and worrying: “Won"t the wave of business concentration turn into an uncontrollableanti-competitive force?"   There"s no question that the big are getting bigger and morepowerful. Multinational corporations accounted for less than 20% ofinternational trade in 1982. Today the figure is more than 25% and growingrapidly. International affiliates account for a fast-growing segment ofproduction in economies that open up and welcome foreign investment. InArgentina, for instance, after the reforms of the early 1990s, multinationalswent from 43% to almost 70% of the industrial production of the 200 largestfirms. This phenomenon has created serious concerns over the role of smallereconomic firms, of national businessmen and over the ultimate stability of theworld economy。   I believe that the most important forces behind the massive M&Awave are the same that underlie the globalization process: fallingtransportation and communication costs, lower trade and investment barriers andenlarged markets that require enlarged operations capable of meeting customers"demands. All these are beneficial, not detrimental, to consumers. Asproductivity grows, the world"s wealth increases。   Examples of benefits or costs of the current concentration wave arescanty. Yet it is hard to imagine that the merger of a few oil firms todaycould re-create the same threats to competition that were feared nearly acentury ago in the U.S., when the Standard Oil trust was broken up. The mergersof telecom companies, such as WorldCom, hardly seem to bring higher prices forconsumers or a reduction in the pace of technical progress. On the contrary,the price of communications is coming down fast. In cars, too, concentration isincreasing—witness Daimler and Chrysler, Renault and Nissan—but it doesnot appear that consumers are being hurt。   Yet the fact remains that the merger movement must be watched. Afew weeks ago, Alan Greenspan warned against the megamergers in the bankingindustry. Who is going to supervise, regulate and operate as lender of lastresort with the gigantic banks that are being created? Won"t multinationalsshift production from one place to another when a nation gets too strict aboutinfringements to fair competition? And should one country take upon itself therole of“defending competition" on issues that affect many othernations, as in the U.S. vs. Microsoft case?   33. What is the typical trend of businesses today?   [A]To take in more foreign funds   [B]To invest more abroad   [C]To combine and become bigger   [D]To trade with more countries   34. According to the author, one of the driving forces behindM&A wave is _________。   [A]the greater customer demands   [B]a surplus supply for the market   [C]a growing productivity   [D]the increase of the world"s wealth   35. From paragraph 4 we can infer that _________。   [A]the increasing concentration is certain to hurt consumers   [B]WorldCom serves as a good example of both benefits and costs   [C]the costs of the globalization process are enormous   [D]the Standard Oil trust might have threatened competition   36. Toward the new business wave, the writer"s attitude can be saidto be _________。   [A]optimistic   [B]objective   [C]pessimistic   [D]biased
2023-08-01 17:43:091

有四个英语单词,帮忙造一下句

He held his breath before the interview started.She held her breath under great fear.Sports relate to one"s health.The economy relates to a countries power.One who is optimistic likes to face difficulty.Being optimistic makes one happier.No one likes to talk to person who is pessmistic.Pessmistic person gives up easily
2023-08-01 17:43:293

写一篇关于乐观与悲观的120字的英语作文

Being optimistic means being hopeful about the future and the success of something in particular. Being pessimistic, on the other hand, means being sad about the future and always thinking that something bad is going to happen. Let's take the challenges in our everyday life as an example. Faced with a challenge, a pessimistic person may feel gloomy, distressed, and even afraid of it. He considers himself powerless, and complains about it all day long, refusing even to have a try before giving it up in the end. An optimistic person, however, may adopt an entirely different approach. He may not regard the challenge as something bad, instead, he takes it as an excellent opportunity to display his abilities and talent. Pressure simply adds to his enthusiasm to realize his dream. Obviously, being optimistic and being pessimistic are two different attitudes towards life, which always mean the difference between failure and success. It is natural that we encounter challenges of one kind or another in our life. If we are pessimistic whenever we are confronted with challenges we are destined to have one failure after another. If we are pessimistic, we are destined to fail, ending up accomplishing nothing. But if we approach the challenges in an optimistic way, we may go from victory to victory. Therefore, be optimistic, all the time.
2023-08-01 17:43:391

写一篇关于乐观与悲观的120字的英语作文

Being optimistic means being hopeful about the future and the success of something in particular. Being pessimistic, on the other hand, means being sad about the future and always thinking that something bad is going to happen.Let's take the challenges in our everyday life as an example. Faced with a challenge, a pessimistic person may feel gloomy, distressed, and even afraid of it. He considers himself powerless, and complains about it all day long, refusing even to have a try before giving it up in the end. An optimistic person, however, may adopt an entirely different approach. He may not regard the challenge as something bad, instead, he takes it as an excellent opportunity todisplay his abilities and talent. Pressure simply adds to his enthusiasm to realize his dream.Obviously, being optimistic and being pessimistic are two different attitudes towards life, which always mean the difference between failure and success. It is natural that we encounterchallenges of one kind or another in our life. If we are pessimistic whenever we are confronted with challenges we are destined to have one failure after another. If we are pessimistic, we are destined to fail, ending up accomplishing nothing. But if we approach thechallenges in an optimistic way, we may go from victory to victory.Therefore, be optimistic, all the time.
2023-08-01 17:43:581

标题: Little or A Little?

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2023-08-01 17:44:075

夏天英语怎么说?

I like summer best!In summer,the weather is sunny and hot.I can eat my favourite food—ice creams!I"m very happy!I like swimming in the pool with my friends.In summer,the flowers are beautiful,the grss is very green.I can have a picnic with my parents.And we have fun!I like summer best! Do you like it,too?翻译如下:我最喜欢夏天!夏天,天气晴朗炎热。我可以吃我最喜欢的食物冰淇淋!我很高兴!我喜欢和我的朋友们在游泳池里游泳。夏天,花儿很漂亮,草地很绿。我可以和我的父母一起野餐。我们玩得很开心!我最喜欢夏天!你也喜欢吗?英语方言:英语是一种多中心语言。由于英语的使用范围极为广泛,不可避免地出现了各种地区性变体。语言学家已经不再把伦敦或英国上层人士的英语作为唯一的标准英语。除英国英语外,最重大的是北美英语和澳新英语。自从17、18世纪,美国英语、加拿大英语、澳大利亚英语、新西兰英语开始成为独特的方言。它们也各有自己的地区性的语词、语法和语音。其他像印度英语、东南亚英语、加勒比地区英语和非洲某些新兴国家的英语,都各自受到了当地语言影响、具有语音和词汇上的特点。英语的主要方言在语音上有着相当明显的差别,拼写的差别则较小。一般人们以一些学术机构的辞书作为标准的英语,例如《牛津英语词典》等。在学术、科技文章方面,来自各国作者使用的是一种共同文体。第二次世界大战以前,“美式英语”这个术语通常被理解为美国人特有的语词和语法,在当时的一些“纯洁主义”的英国文人看来,它不是纯正的英文,但到了第二次世界大战前后,“美式英语”一词的概念逐渐变了,只指在美国本土上使用的英语,而不论其与英国英语的异同。在第二次世界大战以后,由于美国的大众传播媒介迅速发展,美国英语已反过来对其他方言产生影响,并且正在日益扩大这种影响。
2023-08-01 17:43:491

town过去式

townn.城镇,市镇; 小村庄; 城镇居民; 商业中心名词只有单复数,动词才有过去式和过去分词
2023-08-01 17:43:491

many怎么读

many 英 ["meni]x05 美 ["meni]x05 比较级:more 最高级:mostadj.许多的 pron.许多人或物 n.许多;许多人
2023-08-01 17:43:501

少年是指几岁到几岁

在那啊电话也停机啦啊
2023-08-01 17:43:5112

网络设备初始化主要流程是?

具体流程如下:1) 进行硬件上的准备工作,检查网络设备是否存在,如果存在,则检测设备所使用的硬件资源。2) 进行软件接口上的准备工作,分配net_device结构体并对其数据和函数指针成员赋值。3) 获得设备的私有信息指针并初始化各成员的值。如果私有信息中包括自旋锁或信号量等并发或同步机制,则需对其进行初始化。对net device结构体成员及私有数据的赋值都可能需要与硬件初始化工作协同进行,即硬件检测出了相应的资源,需要根据检测结果填充net_device结构体成员和私有数据。网络设备驱动的初始化函数模板,具体的设备驱动初始化函数并不一定完全和本模板一样,但其本质过程是一致的。xxx_hw_init()函数完成的与硬件相关的初始化操作如下。1) 探测xxx网络设备是否存在。探测的方法类似于数学上的“反证法”,即先假设存在设备xxx,访问该设备,如果设备的表现与预期一致,就确定设备存在;否则,假设错误,设备xxx不存在。2) 探测设备的具体硬件配置。一些设备驱动编写得非常通用,对于同类的设备使用统一的驱动,我们需要在初始化时探测设备的具体型号。另外,即便是同一设备,在硬件上的配置也可能不一样,我们也可以探测设备所使用的硬件资源。3) 申请设备所需要的硬件资源,如用request region ()函数进行IO端口的申请等,但是这个过程可以放在设备的打开函数xxx open()中完成。
2023-08-01 17:43:541

星期一,二三四五用英语怎么说

MONDAYTUESDAYWEDNESDAYTHURSDAYFRIDAY
2023-08-01 17:43:573

星期一二三四五六七外语怎么写

星期一Monday星期二Tuesday 星期三Wednesday 星期四Thursday 星期五Friday 星期六Saturday星期日 Sunday
2023-08-01 17:43:441

芭蕾舞主要基本动作是什么

那个就多了 头上的 手上的 腿上的 和脚下的 看你要做什么?
2023-08-01 17:43:438

单词many怎么读many怎么读英语

1、many英[_meni]美[_meni],adj.许多的,大量的;pron.许多人(或物),许多(尤用于否定句或正式用语,表示大量);det.许多的,大量的;多少(用于疑问句以询问数字大小);许多,很多;n.多数人(东西),大多数人;民众,百姓;adv.(回答有关数量的提问时)多。2、[例句]Thecollegehascloselinkswithmanyotherinstitutions.这所学院与其他许多的机构有着紧密的联系。
2023-08-01 17:43:411

town和city的区别?

你好!town[taun]n.镇,市镇;市区,市中心city[u02c8siti]n.城市,都市town面积比city小。如果对你有帮助,望采纳。
2023-08-01 17:43:414

中国药典主要内容分为

中国药典主要内容分为一部收载药材和饮片、植物油脂和提取物、成方制剂和单味制剂等;二部收载化学药品、抗生素、生化药品以及放射性药品等;三部收载生物制品;四部收载通则,包括:制剂通则、检验方法、指导原则、标准物质和试液试药相关通则、药用辅料等。中国药典的主要作用:作为我国保证药品质量的法典,本版药典在保持科学性、先进性、规范性和权威性的基础上,着力解决制约药品质量与安全的突出问题,着力提高药品标准质量控制水平,充分借鉴了国际先进技术和经验,客观反映了中国当前医药工业、临床用药及检验技术的水平。必将在提高药品质量过程中起到积极而重要的作用,并将进一步扩大和提升我国药典在国际上的积极影响。《中国药典》是国家药品标准的重要组成部分,其颁布实施必将对保障药品质量、维护公众健康、促进医药产业发展产生积极而深远的影响。有利于促进我国医药产品走向国际。新版《中国药典》在充分借鉴国际先进药典管理经验和质控技术的同时,兼顾我国医药产业的实际现状,充分展现我国医药产业创新发展的最新成果。
2023-08-01 17:43:361

什么叫罗莉,什么叫御姐?

你OUT了
2023-08-01 17:43:357