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Difference between int[] array and int array[]
...h is life...
Fortunately I don't think I've ever seen this (valid) code:
String[] rectangular[] = new String[10][10];
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Checking if a variable is defined?
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Use the defined? keyword (documentation). It will return a String with the kind of the item, or nil if it doesn’t exist.
>> a = 1
=> 1
>> defined? a
=> "local-variable"
>> defined? b
=> nil
>> defined? nil
=> "nil"
>> defined? String
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Android Use Done button on Keyboard to click button
...t"
android:layout_height="wrap_content" android:hint="@string/prompt_unidades"
android:inputType="number" android:maxLines="1"
android:singleLine="true"
android:textAppearance="?android:textAppearanceSmall"
...
海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... 循环100w次计算这两个数据的相似度。代码结果如下：
String s1 = "你妈妈喊你回家吃饭哦，回家罗回家罗" ;
String s2 = "你妈妈叫你回家吃饭啦，回家罗回家罗" ;
long t1 = System.currentTimeMillis();
for (int i = 0; i < 1000000; i++) {
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Mutable vs immutable objects
... Using mutable objects gets a lot of bad press (e.g. returning an array of strings from a method) but I'm having trouble understanding what the negative impacts are of this. What are the best practices around using mutable objects? Should you avoid them whenever possible?
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Populating a razor dropdownlist from a List in MVC
... {
Value = x.UserRoleId.ToString(),
Text = x.UserRole
});
return new SelectList(roles, "Value", "Text");
}
public ActionResult AddNewUser()
{
var model = new UserRoleViewModel
...
Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...tributes_cache: {}
=> nil
>>
If you want to just preview some string contents, try using raise (for example in models, controllers or some other inaccessible place). You get the backtrace for free:)
>> raise Rails.root
RuntimeError: /home/marcin/work/github/project1
from (irb...
How to tell if JRE or JDK is installed
...an be inferred (most of the time)...
public static boolean isJDK() {
String path = System.getProperty("sun.boot.library.path");
if(path != null && path.contains("jdk")) {
return true;
}
return false;
}
However... on Linux this isn't as reliable... For example...
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The source was not found, but some or all event logs could not be searched
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Didnt work for me.
I created a new key and string value and managed to get it working
Key= HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\eventlog\Application\<Your app name>\
String EventMessageFile value=C:\Windows\Microsoft.NET\Framework\v2.0.50727\Eve...
How can I have grep not print out 'No such file or directory' errors?
...ry creating 2 files in a dir, 'aaa.txt' and 'a b.txt', both containing the string 'some text'. The command /bin/ls -1 | xargs grep 'some text' will give you "no such file or directory" because it breaks up 'a b.txt' into 2 args. If you suppress, you won't notice you missed a file.
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