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What's the difference between a Future and a Promise?
...ussion, Promise has finally been called CompletableFuture for inclusion in Java 8, and its javadoc explains:
A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent functions and actions that trigger upon its completion...
Get JSF managed bean by name in any Servlet related class
...even though the static utility method findBean() is defined inside a plain Java class. How is it available there in a plain Java class which is not managed by JSF?
– Tiny
Jul 10 '15 at 1:07
...
WebService Client Generation Error with JDK8
...
Well, I found the solution. (based on http://docs.oracle.com/javase/7/docs/api/javax/xml/XMLConstants.html#ACCESS_EXTERNAL_SCHEMA)
Create a file named jaxp.properties (if it doesn't exist) under /path/to/jdk1.8.0/jre/lib and then write this line in it:
javax.xml.accessExternalSchema ...
JSF backing bean structure (best practices)
... "model" -- think DATA. A JSF model-bean should be a POJO that follows the JavaBean design pattern with getters/setters encapsulating properties. The most common use case for a model bean is to be a database entity, or to simply represent a set of rows from the result set of a database query.
Backin...
How to test that no exception is thrown?
...
Java 8 makes this a lot easier, and Kotlin/Scala doubly so.
We can write a little utility class
class MyAssertions{
public static void assertDoesNotThrow(FailingRunnable action){
try{
action.run()
}
catc...
Export/import jobs in Jenkins
...ML file.
get-job: Dumps the job definition XML to stdout
So you can do
java -jar jenkins-cli.jar -s http://server get-job myjob > myjob.xml
java -jar jenkins-cli.jar -s http://server create-job newmyjob < myjob.xml
It works fine for me and I am used to store in inside my version control ...
How do getters and setters work?
...
In Java getters and setters are completely ordinary functions. The only thing that makes them getters or setters is convention. A getter for foo is called getFoo and the setter is called setFoo. In the case of a boolean, the get...
Can inner classes access private variables?
...ner can access the member variable var of an object of type Outer.
Unlike Java though, there is no correlation between an object of type Outer::Inner and an object of the parent class. You have to make the parent child relationship manually.
#include <string>
#include <iostream>
class...
Why do we usually use || over |? What is the difference?
...nd && forms, rather than the | and & forms of these operators, Java will not bother to evaluate the right-hand operand alone.
It's a matter of if you want to short-circuit the evaluation or not -- most of the time you want to.
A good way to illustrate the benefits of short-circuiting w...
使用App Inventor扩展实现多点触控：Scale Detector 缩放检测 · App Inventor 2 中文网
...。 你还可以练习实现扩展本身。
规模检测或扩展作为 Java 代码实现，编译和处理以生成 aix 文件，如 App Inventor 扩展中所述。 Java 代码文件 ScaleDetector.java 可在此处获得：
edu.mit.appinventor.ScaleDetector_src.zip
这段扩展代码只不过是...