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Java using enum with switch statement
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The part you're missing is converting from the integer to the type-safe enum. Java will not do it automatically. There's a couple of ways you can go about this:
Use a list of static final ints rather than a type-safe enum and switch on the int value you recei...
How to list containers in Docker
...izes use the given command:
docker ps -s
The content presented above is from docker.com.
In the new version of Docker, commands are updated, and some management commands are added:
docker container ls
It is used to list all the running containers.
docker container ls -a
And then, if you wa...
Do I need to heartbeat to keep a TCP connection open?
... firewall), you may need keepalives in order to keep the state table entry from expiring.
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Looking for simple Java in-memory cache [closed]
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Thanks, an additional question: If I retrieve an object from EHcache (say, an array), and modify it - will the object be updated in the cache? ie. is EHCache maintaining references to the objects?
– sanity
Feb 22 '09 at 20:38
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How to get the unique ID of an object which overrides hashCode()?
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If you cannot access the source code, just extend from it and use the extended class. Simply quick, easy and dirty solution but it works.
– John Pang
Jan 26 '15 at 7:34
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程序员之网络安全系列（五）：数字证书以及12306的证书问题 - 更多技术 - ...
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Symantec(CA) 把Issuer,公钥A,Subject(一般是网站的域名),Valid from,Valid to等信息以明文的形式写到证书里面，然后用一个指纹算法(SHA1或者MD5 )计算出这些数字证书内容的一个指纹(摘要)，并把指纹和指纹算法用自己的私钥D进行加密，然...
How can I detect if a selector returns null?
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I like to use presence, inspired from Ruby on Rails:
$.fn.presence = function () {
return this.length !== 0 && this;
}
Your example becomes:
alert($('#notAnElement').presence() || "No object found");
I find it superior to the proposed $.fn....
Matching an empty input box using CSS
...ibute was only available in Chrome and Firefox in 2011, and this answer is from 2010. However times have changed and this is no longer the "best" answer, so I have unmarked it as accepted.
– Sjoerd
Apr 12 '17 at 7:47
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Ruby, !! operator (a/k/a the double-bang) [duplicate]
...n negate the negation. It's useful because you can use it to get a boolean from any value. The first ! will convert the argument to a boolean, e.g. true if it's nil or false, and false otherwise. The second will negate that again so that you get the boolean value of the argument, false for nil or fa...
Converting BigDecimal to Integer
...o an int. This conversion is analogous to a narrowing primitive conversion from double to short as defined in the Java Language Specification: any fractional part of this BigDecimal will be discarded, and if the resulting "BigInteger" is too big to fit in an int, only the low-order 32 bits are retur...