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How can I build a small operating system on an old desktop computer? [closed]
This might be in vain, as I know writing an operating system is unbearably complicated (especially by oneself).
20 Answers
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Why is the default value of the string type null instead of an empty string?
It's quite annoying to test all my strings for null before I can safely apply methods like ToUpper() , StartWith() etc...
...
How to check edittext's text is email address or not?
...A-Z]{2,4}$";
Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(email);
return matcher.matches();
}
Pass your edit text string in this function .
for right email verification you need server side authentication
Note there is...
LR性能指标解释 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Runner[/url]）：用户执行情况、场景状态、事务响应时间、TPS等。
7.测试机资源：CPU、Memory、网络、磁盘空间。
监控工具
性能测试通常采用下列工具进行监控：
1.Profiler。一个记录log的类，阿里巴巴集团自主开发，嵌入到应用...
Removing all empty elements from a hash / YAML?
...add a compact method to Hash like this
class Hash
def compact
delete_if { |k, v| v.nil? }
end
end
or for a version that supports recursion
class Hash
def compact(opts={})
inject({}) do |new_hash, (k,v)|
if !v.nil?
new_hash[k] = opts[:recurse] && v.class == Has...
Python SQL query string formatting
...PROCEDURE example()
BEGIN
SELECT 2+222+2222+222+222+2222+2222 AS this_is_a_really_long_string_test;
END //
DELIMITER;
#calling the procedure gives you the result of whatever query you want to put in this procedure. You can actually process multiple queries within a procedure. The call jus...
How to format an inline code in Confluence?
...raehamF @GONeale I just included [class^=SpaceCustomSettingsBlockComponent_unsupportedMacros]{display: none;} in the custom CSS :p
– Samizdis
May 2 '19 at 13:42
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What is the difference between Debug and Release in Visual Studio?
...into functions that might otherwise have been optimized away or in-lined
A _DEBUG preprocessor definition that allows you to write code that acts differently in debug mode compared to release, for example to instrument ASSERTs that should only be used while debugging
Linking to libraries that have a...
ALTER TABLE to add a composite primary key
...nt drop column id;
ERROR 1025 (HY000): Error on rename of
'./test/#sql-a04_b' to './test/parent' (errno: 150).
If you want to drop a primary key that's being referenced by another table, you will have to drop the foreign key in that other table first. You can recreate that foreign key if you sti...
Proper way to exit iPhone application?
...ck the Q&A here: https://developer.apple.com/library/content/qa/qa1561/_index.html
Q: How do I programmatically quit my iOS application?
There is no API provided for gracefully terminating an iOS application.
In iOS, the user presses the Home button to close applications. Should y...