javabeans

问题 The Spring Framework API doc says: The convention used is to return the uncapitalized short name of the Class, according to JavaBeans property naming rules: So, com.myapp.Product becomes product; com.myapp.MyProduct becomes myProduct; com.myapp.UKProduct becomes UKProduct. I looked at Suns website to find a definition, but didn\'t find one. I wonder about a rule for names with more than one upper case character at the beginning. Is the rule that the first character is upper case if the second

问题 Have seen some similar questions: What is the difference between a JavaBean and a POJO? What is the Difference Between POJO (Plain Old Java Object) and DTO (Data Transfer Object)? Can you also please tell me the contexts in which they are used? Or the purpose of them? 回答1: JavaBeans A JavaBean is a class that follows the JavaBeans conventions as defined by Sun. Wikipedia has a pretty good summary of what JavaBeans are: JavaBeans are reusable software components for Java that can be

问题 What is a JavaBean and why do I need it? Since I can create all apps with the class and interface structure? Why do I need beans? And can you give me some examples where beans are essential instead of classes and interfaces? Please explain the essentiality of a bean in the below context: Wep apps Standalone apps 回答1: They often just represents real world data. Here's a simple example of a Javabean: public class User implements java.io.Serializable { // Properties. private Long id; private

问题 I understood, I think, that a \"Bean\" is a Java class with properties and getters/setters. As much as I understand, it is the equivalent of a C struct. Is that true? Also, is there a real syntactic difference between a bean and a regular class? Is there any special definition or an interface? Basically, why is there a term for this? Also what does the Serializable interface mean? 回答1: A JavaBean is just a standard All properties private (use getters/setters) A public no-argument constructor

问题 I have results from Query query = session.createQuery(\"From Pool as p left join fetch p.poolQuestion as s\"); query and I would like to display it on JSP. I have loop: <c:forEach items=\"${pools}\" var=\"pool\"> <p>${pool.name}</p> </c:forEach> and I would like to display results from poolQuestion table (which is Join table). The value that i want to display is \'answer\'. How can I do it? <c:forEach items=\"${pools}\" var=\"pool\"> <p>${pool.answer}</p> <p>${pool.name}</p> </c:forEach> The