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How to sort List of objects by some property
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Using Comparator
For Example:
class Score {
private String name;
private List<Integer> scores;
// +accessor methods
}
Collections.sort(scores, new Comparator<Score>() {
public int compare(Score o1, Score o2) {
// compare two ins...
How to get next/previous record in MySQL?
Say I have records with IDs 3,4,7,9 and I want to be able to go from one to another by navigation via next/previous links. The problem is, that I don't know how to fetch record with nearest higher ID.
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What is the difference between id and class in CSS, and when should I use them? [duplicate]
Here I gave an id to the div element and it's applying the relevant CSS for it.
15 Answers
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File being used by another process after using File.Create()
...le is already open. You don't really need the file.Create method at all:
string filePath = @"c:\somefilename.txt";
using (StreamWriter sw = new StreamWriter(filePath, true))
{
//write to the file
}
The boolean in the StreamWriter constructor will cause the contents to be appended if the file...
When to use AtomicReference in Java?
... Some examples include the wrapper classes of Long and Double, as well as String, just to name a few. (According to Programming Concurrency on the JVM immutable objects are a critical part of modern concurrency).
Next, why AtomicReference is better than a volatile object for sharing that shared...
Xcode 4 and Core Data: How to enable SQL Debugging
... Any way to print this -com.apple.CoreData.MigrationDebug 1 on string file, so that user can upload the log file
– rhlnair
Aug 22 '14 at 10:42
add a comment
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Is there an MD5 Fixed Point where md5(x) == x?
...cessarily also have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a fixed point is 1/2128.
Thus, the probability that no 128-bit string is a fixed point is (1 − 1/2128)2128, so t...
Creating a ZIP Archive in Memory Using System.IO.Compression
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Just another version of zipping without writing any file.
string fileName = "export_" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xlsx";
byte[] fileBytes = here is your file in bytes
byte[] compressedBytes;
string fileNameZip = "Export_" + DateTime.Now.ToString("yyyyMMddhhmmss") +...
Unit testing void methods?
...actually split it into two methods that can now be independently tested.
string[] ExamineLogFileForX( string sFileName );
void InsertStringsIntoDatabase( string[] );
String[] can be easily verified by providing the first method with a dummy file and expected strings. The second one is slightly t...
How to send file contents as body entity using cURL
...pecting: --header: "<header_name>:<header_value>" as a single string.
– Roy Hinkley
Jul 27 '17 at 18:36
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