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今天测试老师在测试功能的时候，发现功能提交时居然报No value present错误了。而且还是在其它周边系统上，刚开始以为不是我们系统应该跟我们没关系，直到对方开发老师找过来查日志后，才发现是我写的代码有问题，哭了，还好是测试阶段；原因是我使用了Optional调用Get方法前没有先进行isPr...

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【Java 8 新特性】Java LocalDate 详解

/**LocalDate是Java 8中的日期时间API之一，它提供了一种处理日期（年月日）的简单方式，而不涉及时间和时区。LocalDate是一个不可变的类，它表示ISO-8601日历系统中的日期，它是线程安全的。LocalDate类提供了许多方法来处理日期，例如获取日期的年份，月份和日等。下面是...

Java 8 新特性：Java 类库的新特性之 Stream类（二）

5.转换Stream转换Stream其实就是把一个Stream通过某些行为转换成一个新的Stream。eg：List<Integer> nums = Lists.newArrayList(1,1,null,2,3,4,null,5,6,7,8,9,10); System.out.prin...

Java 8 新特性：Java 类库的新特性之 Stream类（一）

注：此文中涉及到的一部分图片为网络图片，若有问题，请联系我将其删除。）一.Java8对IO/NIO 的改进Java 8 对 IO/NIO 也做了一些改进，主要包括：改进了java.nio.charset.Charset 的实现，使编码和解码的效率得以提升；精简了jre/lib/char...

Java 8 新特性：Java 类库的新特性之日期时间API (Date/Time API )

日期时间API (Date/Time API )1.Java8之前java.util.Date和Calendar类的弊端1）最开始的时候，Date既要承载日期信息，又要做日期之间的转换，还要做不同日期格式的显示，职责较繁杂（不遵守单一职责）。后来从JDK 1.1 开始，这三项职责分开了...

Java 8 新特性：Java 类库的新特性之 Optional类

Java 类库的新特性之 Optional类1.Optional简述到目前为止，著名的NullPointerException是导致Java应用程序失败的最常见原因。过去，为了解决空指针异常，Google公司著名的Guava项目引入了Optional类，Guava通过使用检查空值的方式来防止代码污...

免费下载！想要了解最全面的Java8新特性知识，就看《Java8从入门到精通》

点击免费下载本书：https://developer.aliyun.com/topic/download?id=8216 本书围绕Java8新特性展开，对其中两个新特性：Lambda表达式和Stream API做了详细的阐述，并对其操作要求进行充足的讲解。列举了作者自己平时所遇的与之相关的...

【Java8新特性】冰河带你看尽Java8新特性，你想要的都在这儿了！！（文本有福利）

如何持续提升自身能力如果你觉得冰河写的还不错，请微信搜索并关注「冰河技术」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「冰河技术」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「冰河技术」微信公众号文章，吊打面试官，成功跳槽到大厂...

【Java8新特性】不只是Java8的注解，你想要的都在这儿了！！

JDK5中的注解1.注解（@）注解就相当于一种标记，在程序中加了注解就等于为程序加了某种标记。（JDK1.5新特性）。2.作用告诉javac编译器或者java开发工具……向其传递某种信息，作为一个标记。3.如何理解注解？一个注解就是一个类。标记可以加在包、类、字段、方法，方法参...

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