Recently I'm reading the source code of Spring Framework. Something I can't understand goes here: public Member getMember() { // NOTE: no ternary expression to retain JDK <8 compatibility even when using // the JDK 8 compiler (potentially selecting java.lang.reflect.Executable // as common type, with that new base class not available on older JDKs) if (this.method !=
最近我正在阅读Spring Framework的源代码。 我不明白的事情在这里: public Member getMember() { // NOTE: no ternary expression to retain JDK <8 compatibility even when using // the JDK 8 compiler (potentially selecting java.lang.reflect.Executable // as common type, with that new base class not available on older JDKs) if (this.method != null) { return this.method; }
Using Netbeans IDE 8.0.2 and JDK8, when I try to generate a PDF report i get this error: The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class filesvalue = ((java.lang.String)field_type.getValue()).contentEquals("XML"); //$JR_EXPR_ID=26$ This error occurs everytime I use this expression $F{type}.contentEquals("XML") or even
使用Netbeans IDE 8.0.2和JDK8时,当我尝试生成PDF报告时,出现此错误: java.lang.CharSequence类型无法解析。 它是从所需的.class filesvalue =((java.lang.String)field_type.getValue())。contentEquals(“XML”); // $ JR_EXPR_ID = $ 26 每次使用此表达式$ F {type} .contentEquals(“XML”)或者甚至是.equals表达式都会发生此错误。 使用JDK6它不会发生。 我搜索了网页,我找到了一个修复方法,但是在这个
I have a very simple (existing) web service that I would like to generate a web service client against using JDK8. I'm using a pure JDK8 tool chain meaning I use the wsimport tool from my JDK8 dir. Now to the problem: The Java source code generated by the wsimport tool in JDK8 is not JDK8 Javadoc compliant. As you may be aware the Javadoc tool has become a lot more strict in JDK8. Cons
我有一个非常简单的(现有的)Web服务,我想生成一个Web服务客户端来反对使用JDK8。 我使用纯JDK8工具链,这意味着我使用JDK8目录中的wsimport工具。 现在到这个问题:由JDK8中的wsimport工具生成的Java源代码不符合JDK8 Javadoc标准。 您可能已经知道Javadoc工具在JDK8中变得更加严格。 考虑以下简单的模式: <xs:schema version="1.0" targetNamespace="http://mavenwsserver.ws.mytest.org/"> <xs:element
I just started messing around with Java, as a former C/C++ average programmer. I'm intrigued with the way arrays are declared in JDK8. I'm following a book with says to me to declare the array as a object as following. int[] exampleArray = new int[10]; I totally agree in using the array as an object. But on my IDE (Netbeans 8), I get a notification that says that "field exam
我刚开始搞乱Java,担任C / C ++平均程序员。 我对JDK8中声明数组的方式很感兴趣。 我跟着一本书,对我说要将数组声明为下面的对象。 int[] exampleArray = new int[10]; 我完全同意将该数组用作对象。 但在我的IDE(Netbeans 8)上,我收到一个通知,说“字段示例数组可以是最终的”。 当我删除new int[10]部分时,我得到正常的编译并且没有通知。 这是否意味着JDK中的数组是动态分配的? 我没有尝试迭代数组。 从
I have a third party WSDL, I need to write code in JAVA for a web service client to invoke the operations in the third party WSDL. Right now, I have generated the client stub using the WSDL2JAVA tool from Axis and used the XMLbeans for data binding. What is the best approach to do this JAVA? I read about SAAJ, looks like that will be more granular level of approach? Is there any other way
我有第三方WSDL,我需要在JAVA中为Web服务客户端编写代码以调用第三方WSDL中的操作。 现在,我使用Axis的WSDL2JAVA工具生成客户端存根,并使用XMLbeans进行数据绑定。 做这个JAVA的最佳方法是什么? 我读过关于SAAJ,看起来会更细粒度的方法吗? 除了使用WSDL2Java工具生成代码之外,还有其他方法吗? 也许wsimport在另一个选项。 优缺点都有什么? 有人可以发送关于这些主题的一些好教程的链接吗? 使用WSDL2Java
By Oracle's definition, Sometimes, you want to have variables that are common to all objects. This is accomplished with the static modifier. Fields that have the static modifier in their declaration are called static fields or class variables. They are associated with the class, rather than with any object. Every instance of the class shares a class variable, which is in one fixed locat
按照Oracle的定义, 有时候,你想拥有所有对象通用的变量。 这是通过静态修改器完成的。 在其声明中具有静态修饰符的字段称为静态字段或类变量。 他们与班级相关,而不是与任何对象相关联。 该类的每个实例共享一个类变量,它位于内存中的一个固定位置。 通过这个定义,推导出一个静态变量属于这个类是安全的,并且不应该被类的任何对象修改。因为所有对象都共享它。 因此,来自相同定义的这条线有点令人困惑: 任何
If I just use synchronized, not wait/notify method, will it still keep thread-safe ? What's the difference ? Thx in advance. Using synchronized makes a method / block accessible by only on thread at a time. So, yes, it's thread-safe. The two concepts are combined, not mutually-exclusive. When you use wait() you need to own the monitor on that object. So you need to have synchro
如果我只使用synchronized,而不是wait / notify方法,它是否仍然保持线程安全? 有什么不同 ? Thx提前。 使用synchronized可以一次只在线程上访问方法/块。 所以,是的,它是线程安全的。 这两个概念相结合,不是相互排斥的。 当您使用wait()您需要拥有该对象上的监视器。 所以你需要在它之前synchronized(..) 。 使用.wait()使当前线程停止,直到另一个线程在它等待的对象上调用.notify() 。 这是对synchronized
I'm new to java. I'm little bit confused between Threadsafe and synchronized. Thread safe means that a method or class instance can be used by multiple threads at the same time without any problems occurring. Where as Synchronized means only one thread can operate at single time. So how they are related to each other? The definition of thread safety given in Java Concurrency in Pra
我是新来的Java。 我在Threadsafe和synchronized之间有点混乱。 线程安全意味着一个方法或类实例可以被多个线程同时使用而不会发生任何问题。 同步意味着只有一个线程可以一次运行。 那么他们如何相互关联? Java Concurrency in Practice中给出的线程安全性的定义是: 如果一个类在从多个线程访问时行为正确,则类是线程安全的,无论运行时环境如何调度或交错执行这些线程,以及调用代码没有额外的同步或其他协调。
This question already has an answer here: What does 'synchronized' mean? 15 answers Is there an advantage to use a Synchronized Method instead of a Synchronized Block? 22 answers Java synchronized method lock on object, or method? 10 answers This usage of the synchronized keyword causes the method to acquire a lock on the object that the method is being invoked on. Since you h
这个问题在这里已经有了答案: “同步”是什么意思? 15个答案 使用同步方法而不是同步块有优势吗? 22个答案 Java同步方法锁定对象或方法? 10个答案 synchronized关键字的这种用法会导致该方法获取该方法被调用的对象的锁定。 由于您有5个MultiThr对象,这是5个不同的被锁定的对象。 有很多选项可以解决这个问题,例如,您可以创建一个要在所有MultiThr对象之间共享的对象: public class MultiThr implements Run
This question already has an answer here: What does 'synchronized' mean? 15 answers Synchronized or in general synchronization come when you are dealing with threads . For example, let's say there are 2 threads in you program. Both of these threads are using the same object. (Consider a scenario where one thread is writing to an ArrayList and the other one is reading from it).
这个问题在这里已经有了答案: “同步”是什么意思? 15个答案 当你正在处理线程时,同步或一般同步。 例如,假设您的程序中有2个线程。 这两个线程都使用同一个对象。 (考虑一个线程正在写入ArrayList而另一个线程正在读取的场景)。 在这些情况下,我们必须确保另一个线程在线程写入列表时不会执行读取或写入操作。 这是因为写入列表至少需要3个步骤 从内存中读取 修改对象(列表) 回写到内存。 为了确保这