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What Computer Science concepts should I know? [closed]
...ncepts that helped my development (intellect and code):
Lexing, Parsing, String matching, Regex
Memoization
encapsulation/scoping/closures
caching
Recursion
Iterators/Generators
Functional programming - John Hughes' amazing article had me at "why"
These are whole domains of discrete math, but...
Change Name of Import in Java, or import two classes with the same name
...ompany.installer.implementation.ConfigurationReader {}
public abstract String getLoaderVirtualClassPath();
public static QueryServiceConfigurationReader getInstance() {
return new Implementation();
}
}
In that way you only need to specify the long
Android java.lang.VerifyError?
...hat is not supported on the android SDK level you are using (for instance, String.isEmpty()).
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How to select date without time in SQL
...
I guess he wants a string.
select convert(varchar(10), '2011-02-25 21:17:33.933', 120)
120 here tells the convert function that we pass the input date in the following format: yyyy-mm-dd hh:mi:ss.
...
Why would an Enum implement an Interface?
...
// methods here
}
enum SimpleDataType implements DataType {
INTEGER, STRING;
// implement methods
}
class IdentifierDataType implements DataType {
// implement interface and maybe add more specific methods
}
sha...
Random shuffling of an array
...util.concurrent.ThreadLocalRandom;
class Test
{
public static void main(String args[])
{
int[] solutionArray = { 1, 2, 3, 4, 5, 6, 16, 15, 14, 13, 12, 11 };
shuffleArray(solutionArray);
for (int i = 0; i < solutionArray.length; i++)
{
System.out.print(solutionArray[i] ...
Writing a pandas DataFrame to CSV file
...efault is True).
It would be wise to set this parameter if you are writing string data so that other applications know how to read your data. This will also avoid any potential UnicodeEncodeErrors you might encounter while saving.
Compression is recommended if you are writing large DataFrames (>1...
Regular expression to match standard 10 digit phone number
...l.
\s*$ #Match any ending whitespaces if any and the end of string.
To make the Area Code optional, just add a question mark after the (\d{3}) for the area code.
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Calculate date/time difference in java [duplicate]
...this for a friendly representation of time differences (in milliseconds):
String friendlyTimeDiff(long timeDifferenceMilliseconds) {
long diffSeconds = timeDifferenceMilliseconds / 1000;
long diffMinutes = timeDifferenceMilliseconds / (60 * 1000);
long diffHours = timeDifferenceMillisec...
Remove duplicates from a List in C#
...
its unbelievable fast... 100.000 strings with List takes 400s and 8MB ram, my own solution takes 2.5s and 28MB, hashset takes 0.1s!!! and 11MB ram
– sasjaq
Mar 25 '13 at 22:28
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