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App Inventor 2 文本代码块 · App Inventor 2 中文网
...换，之间赋值就可以了。文本赋值给数字变量如下：
运行结果：124
注意：数字变量初始化的时候要给一个数字的初始值，表明它是数字。
如果文本中含有非数字内容，则赋值给数字后，数字变量自动变成文本变量，后续的...
Create array of regex matches
In Java, I am trying to return all regex matches to an array but it seems that you can only check whether the pattern matches something or not (boolean).
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Java variable number or arguments for a method
...reat explanation of the difference here: programmerinterview.com/index.php/java-questions/…
– Dick Lucas
Aug 3 '14 at 15:25
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What is WEB-INF used for in a Java EE web application?
I'm working on a Java EE web application with the following source code structure:
5 Answers
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Convert JSON style properties names to Java CamelCase names with GSON
I'm using GSON to convert JSON data I get to a Java object. It works pretty well in all my tests.
The problem is that our real objects have some properties named like is_online. GSON only maps them if they are named totally equal, it would be nice to have GSON convert the names to Java camel case ...
c++ Timer使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
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hWnd 是欲设置定时器的窗体句柄。定时时间到时，系统会向该窗体发送WM_TIMER消息。
nIDEvent 定时器标识符。在一个窗体内可以使用多个定时器，不同的定时器根据nIDEvent来区分。
uElapse 定时时间，单位...
程序员之网络安全系列（四）：数据加密之非对称秘钥 - 更多技术 - 清泛网 -...
...方交换信息，安全地达成一致的密钥，这就是“公开密钥系统”。相对于“对称加密算法”这种方法也叫做“非对称加密算法”。
与对称加密算法不同，非对称加密算法需要两个密钥：公开密钥（publickey）和私有密钥（privatekey...
How do I convert a String to an InputStream in Java?
...tes that represent your original string encoded as UTF-8.
For versions of Java less than 7, replace StandardCharsets.UTF_8 with "UTF-8".
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Specify JDK for Maven to use
...k for a single invocation of maven?
Temporarily change the value of your JAVA_HOME environment variable.
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Booleans, conditional operators and autoboxing
...rue ? null : false` - Boolean (autoboxing of 3rd operand to Boolean)
See Java Language Specification, section 15.25 Conditional Operator ? :
For E1, the types of the 2nd and 3rd operands are Boolean and boolean respectively, so this clause applies:
If one of the second and third operands is ...