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App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
...八进制。比如 0b1010 直接就是 10，0xFF 就是 255。
更方便的是「进制数字块」，点开下拉菜单直接切二进制/八进制/十进制/十六进制输入模式，写 IoT 通信协议或处理硬件返回值时特别顺手。
技巧2：random set seed 让"随机&quo...
What's the difference between interface and @interface in java?
...ss Generation3List extends Generation2List {
// class code goes here
}
PS:
Many annotations replace comments in code.
Reference: http://docs.oracle.com/javase/tutorial/java/annotations/declaring.html
share
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Node.js on multi-core machines
... memory leak will eventually add up.
Setup log collection / monitoring
PS: There's a discussion between Aaron and Christopher in the comments of another post (as of this writing, its the top post). A few comments on that:
A shared socket model is very convenient for allowing multiple processes...
App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...送字符串硬件能收到，WriteStrings 发送却收不到。
同样的字符串数据，通过 WriteBytes 方法发送时硬件正常接收，但通过 WriteStrings 方法发送时硬件收不到或收到截断数据。
源码仓库: mit-cml/appinventor-extensions (extension/bluetoothle ...
What are the relationships between Any, AnyVal, AnyRef, Object and how do they map when used in Java
...sed with both classes that extend AnyRef and classes that extend AnyVal.
PS: In my own view, Java is likely to follow C# in allowing "struct" primitives, and maybe typedefs, as parallelism without resorting to them is proving difficult to accomplish with good performance.
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Ignore mouse interaction on overlay image
...t a menu option could be sized to, 100x40px (an arbitrary value, but it helps with illustrating the sample).
The div has an image overlay, and a link overlay. The link contains a div sized to be the same as the 'menuOption' div. This way a user click is captured across the whole box.
You will ne...
App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？ - App应用开发 ...
...包含姓名、年龄、班级，然后需要快速根据姓名查到对应的班级。用列表也能实现，用字典也能实现——那到底该用哪个？<br><br>今天我们就用<b>对比评测</b>的方式，把 App Inventor 2 中的字典（Dictionary）和列表（List）拉到同一赛...
App Inventor 2 TaifunImage 拓展，图像高级处理功能，剪裁，压缩，翻转等 ...
...放
案例分享2：图片缩放并Base64化
用于基本图像处理的图像扩展。
所需权限：android.permission.READ_EXTERNAL_STORAGE、android.permission.WRITE_EXTERNAL_STORAGE
属性
返回是否隐藏警告。
设置是否隐藏警告。
...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...点前
root.InsertBefore(node,root.ChildeNodes[i]);
//为指定节点的新建属性并赋值
node.SetAttribute("id","11111");
//为指定节点添加子节点
root.AppendChild(node);
//获取指定节点的指定属性值
string id=node.Attributes["id"].Value;
//获取指定节点...
最新编程语言Alda：用文本编辑器就能谱曲 - 创意 - 清泛网 - 专注C/C++及内核技术
...就能谱曲这么多年来，作曲人还有制作人都要用比较复杂的工具以数字化方式谱曲。开发人员 Dave Yarwood 期望通过它最新打造的Alda来改变这一现状...
这么多年来，作曲人还有制作人都要用比较复杂的工具以数字化方式谱曲。开...