when build an spring project with this command: mvn spring-boot:run there will may show an error message like this: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.2.5.RELEASE:run (default-cli) on project gs-rest-service: U…

Hibernate判断某属性不为null 且不可为空时出现Property path [...] does notreference a collection 的问题 处理空的方法: isNotEmpty(propertyName).isNotNull(propertyName) 但是此时报都会报Property path [...] does notreference a collection异常 此时需要将不为空或空查询改为Property.forName("isCancelled"…

http://www.appcoda.com/how-to-add-splash-screen-in-your-ios-app/ What’s Splash Screen? For those who are new to programming and haven’t heard of the term “Splash Screen”, let me first give a brief explanation about it. Splash screen is commonly found…

In the first two posts of this series, I described the bean definition profiles feature, and how it relates to the Environment abstraction new in Spring 3.1 M1. Today we’ll take a look at a second aspect of the Environment – how it helps simplify the…

封装其实就是一个类用双下划线把自己的属性或者方法给限制住 不让其他的类直接调用或者修改  必须通过这个类来进行操作,这个类通过双下划线__把自己的属性和方法给限制住了 封装就是私有的过程 把父类中的属性和方法用双下划线__给装饰后就是只能这个类中使用了 你想使用的需要这个父类名或者super()来掉用 字类不可以继承这个方法或属性了 但是在python解释器中 你私有的过程它的存储是以_类名__私有的内容 来存储的当你的代码中遇到__名字 python解释器就会自动把它转化为_类名__名字的内容…

Sometimes the flex items within a flex container do not fill all the space in the container. It is common to want to tell CSS how to align and space out the flex items a certain way. Fortunately, the justify-content property has several options to do…

The tweet embed header and footer used the flex-direction property earlier with a row value. Similarly, the items inside the .profile-name element would work well stacked as a column. Add the CSS property flex-direction to the header's .profile-name …

The last two challenges used the flex-direction property set to row. This property can also create a column by vertically stacking the children of a flex container. Add the CSS property flex-direction to the #box-container element, and give it a valu…

When designing business classes, a common task is to ensure that a newly created business object is initialized with default property values. This topic explains how different types of properties can be initialized. As an example, a Contact business…

The header and footer in the tweet embed example have child items that could be arranged as rows using the flex-direction property. This tells CSS to align the children horizontally. Add the CSS property flex-direction to both the header and footer a…