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How to read and write excel file
...elsheet
Row row = sheet.createRow(rownum++);
//get object array of prerticuler key
Object[] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr)
{
Cell cell = row.createCell(cellnum++);
if (obj instanceof Strin...
How to properly override clone method?
...o it. (Either Josh Bloch or Neal Gafter)
Here is an extract from openJDK, ArrayList class:
public Object clone() {
try {
ArrayList<?> v = (ArrayList<?>) super.clone();
v.elementData = Arrays.copyOf(elementData, size);
v.modCount = 0;
return v;
} ...
Is there a better way to do optional function parameters in JavaScript? [duplicate]
...n the right track.
The other method some people choose is taking an assoc array of variables iterating through the argument list. It looks a bit neater but I imagine it's a little (very little) bit more process/memory intensive.
function myFunction (argArray) {
var defaults = {
'arg1' ...
How to zip a whole folder using PHP
...ipArchive::OVERWRITE);
// Initialize empty "delete list"
$filesToDelete = array();
// Create recursive directory iterator
/** @var SplFileInfo[] $files */
$files = new RecursiveIteratorIterator(
new RecursiveDirectoryIterator($rootPath),
RecursiveIteratorIterator::LEAVES_ONLY
);
foreach (...
Check if a Class Object is subclass of another Class Object in Java
...stance = someObject instanceof SomeTypeOrInterface;
Example:
assertTrue(Arrays.asList("a", "b", "c") instanceof List<?>);
b) Check if an Object is an instance of a Class or Interface (including subclasses) you only know at runtime:
Class<?> typeOrInterface = // acquire class someho...
How do I concatenate two strings in C?
...ings that some other languages have. A string in C is just a pointer to an array of char that is terminated by the first null character. There is no string concatenation operator in C.
Use strcat to concatenate two strings. You could use the following function to do it:
#include <stdlib.h>
#...
How do I return the response from an asynchronous call?
...s are maybe useful if you set custom headers, set the responseType to blob array buffer or whatever...
Even if you pass 'POSTAPAPAP' as the method it won't throw an error.
Even if you pass 'fdggdgilfdghfldj' as formdata it won't throw an error.
In the first case the error is inside the displayAja...
How do I find the install time and date of Windows?
...at would go as:
Function GetInstallDate: String;
Var
di: longint;
buf: Array [ 0..3 ] Of byte;
Begin
Result := 'Unknown';
With TRegistry.Create Do
Begin
RootKey := HKEY_LOCAL_MACHINE;
LazyWrite := True;
OpenKey ( '\SOFTWARE\Microsoft\Windows NT\CurrentVersion', False );
di ...
In-memory size of a Python structure
... elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes, bytearray)):
size += sum([get_size(i, seen) for i in obj])
return size
Used like so:
In [1]: get_size(1)
Out[1]: 24
In [2]: get_size([1])
Out[2]: 104
In [3]: get_size([[1]])
Out[3]: 184
If you want to know Pyth...
List of Rails Model Types
...ou use Rails 4 and PostgreSQL, you can take advantage of these:
:hstore
:array
:cidr_address
:ip_address
:mac_address
For UI mapping (Model scaffold data type -> HTML), the next image has all the basic field types:
...