Java序列号-阿里云

Java如何生成序列号/订单号

背景在我们的日常开发中，经常会遇到需要生成订单号的需求，比如商品编号、交易单号、快递单号等等，下面就来介绍几种常见的序列号生成方式。数据库生成序列号创建数据表-- ---------------------------- -- Table structure for sequence -- ----...

「大师课」搞定 Java 开发基础

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问一个问题哈，在spark中默认使用java serialization ,但同时也提供了 kryo 序列化借口，今天测试了一下两个不同的序列号借口，发现并没有性能提升，我用的sparksql跑的测试，设计多个join操作，input量为270G , 这个为什么对性能没有提升呢？有大佬做过这方面的研究吗

问一个问题哈，在spark中默认使用java serialization ,但同时也提供了 kryo 序列化借口，今天测试了一下两个不同的序列号借口，发现并没有性能提升，我用的sparksql跑的测试，设计多个join操作，input量为270G , 这个为什么对性能没有提升呢？有大佬做过这方面...

Java自动生成订单序列号

import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.lang3.StringUtils; /** * 产生流水号工具类 * @version V1.0 &nbs...

Java中的序列化与反序列化序列号的问题

不太明白在序列化时为类添加 serialVersionUID 的意义，是说添加了这个field之后，在反序列化时检测到这个值变化了，就会反序列化成上一个版本的这个类？否则在没有它的时候类发生变化反序列化时报错的话，添加了它不也是一样的报错？这个是怎么回事呢？

我的Java开发学习之旅------>Java使用ObjectOutputStream和ObjectInputStream序列号对象报java.io.EOFException异常的解决方法

今天用ObjectOutputStream和ObjectInputStream进行对象序列化话操作的时候，报了java.io.EOFException异常。异常代码如下： java.io.EOFException at java.io.ObjectInputStream$BlockDataInpu...

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更新时间 2022-12-19 10:53:05

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