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Java HashMap performance optimization / alternative
...ound 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a and ...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
...展由中文网开发及维护，基于开源 aix-SQLite 拓展。
与 TaifunSQLite 功能类似，但TaifunSQLite是收费的，美刀。
.aix 拓展下载：
cn.fun123.SQLite.aix
SQLite
SQLite 是 Android 内置的小型、快速、独立的 SQL（结构化查询语...
Java Interfaces/Implementation naming convention [duplicate]
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edited Sep 4 '18 at 17:36
Dave Jarvis
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a...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...，特征也通过其自己唯一的数字 UUID [7] 来区分自己。 图 3 显示了服务和特征的层次性质，其中特征位于 GATT 事务的最低级别。 客户端依靠某个特征为其赋予数据值，以便在与服务器交换数据时可以进行读写。
图 3：BLE GATT 通...
实时预览录制使用指导 · App Inventor 2 中文网
...像头（SwitchCamera）
开始前设置使用前置摄像头（UseFrontCamera）
闪光灯
预览后可调用设置闪光灯（开启）（EnableFlash）
开始前设置开启闪光灯（FlashOn）
声音
录制中可静音（MuteRecording） ...
Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
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edited May 23 '17 at 11:54
Community♦
111 silver badge
answered Aug 18 '12 at 10:11
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Suppressing “is never used” and “is never assigned to” warnings in C#
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edited May 23 '17 at 12:18
Community♦
111 silver badge
answered Sep 29 '10 at 11:10
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git stash blunder: git stash pop and ended up with merge conflicts
...D commit to reverse 2. and to clean up working tree changes made by 2. and 3.; git-reset --hard can be used for this.
Resolve the conflicts. Git will mark the conflicts in the working tree. Edit the files into shape and git add them to the index. Use git commit to seal the deal.
And under TRUE M...
Why can templates only be implemented in the header file?
...athanOliver
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answered Jan 30 '09 at 10:26
Luc TourailleLuc Touraille
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Why no love for SQL? [closed]
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This is partly subjective. So this is my opinion:
SQL has a pseudo-natural-language style. The...