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How can I increment a date by one day in Java?
...y way).
public class DateUtil
{
public static Date addDays(Date date, int days)
{
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.DATE, days); //minus number would decrement the days
return cal.getTime();
}
}
To add one day, p...
Sort hash by key, return hash in Ruby
... to accomplish this you can run the #to_h method on the array of tuples to convert them to a k=>v structure (hash).
hsh ={"a" => 1000, "b" => 10, "c" => 200000}
Hash[hsh.sort_by{|k,v| v}] #or hsh.sort_by{|k,v| v}.to_h
There is a similar question in "How to sort a Ruby Hash by number v...
“unmappable character for encoding” warning in Java
... as EUC-JP and UTF-8.. If -encoding is not specified, the platform default converter is used. (DOC)
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How to get the changes on a branch in Git
...
'git cherry' outputs a list of commit IDs. Can I convert these into a single diff combining all the changes in every commit?
– Jonathan Hartley
Jul 20 '11 at 15:44
...
Best way to compare two complex objects
.... For contained collections, use the SequenceEqual extension method, which internally calls IEquatable<T>.Equals or Object.Equals on each element. This approach will obviously require you to extend your types’ definitions, but its results are faster than any generic solutions involving seria...
lexers vs parsers
...lexer recognizes a character sequence constituting a proper number, it can convert it to its binary value and store with the "number" token.
Similarly, when a parser recognize an expression, it can compute its value and store with the "expression" node of the syntax tree.
They all produce on their...
Differences between Java 8 Date Time API (java.time) and Joda-Time
....Calendar (although latter is not type-safe at all due to excessive use of ints).
Performance
See the other answer by @OO7 pointing to the analysis of Mikhail Vorontsov although point 3 (exception catching) is probably obsolete - see this JDK-bug. The different performance (which is in general fav...
How to compute the sum and average of elements in an array?
... iterate through the array, since your values are strings, they have to be converted to an integer first. And average is just the sum of values divided by the number of values.
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Iterate over a Javascript associative array in sorted order
...rol over the fact that the data is in a regular object, this utility would convert the regular object to your fully-functional dictionary:
a.importObject = function(object) {
for (var i in object) { this.set(i, object); }
};
This was a object definition (instead of a reusable constructor functi...
BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... = 0x11, /* 设备安全管理OOB标志 */
BLE_AD_TYPE_INT_RANGE = 0x12, /* 设备连接参数范围 */
BLE_AD_TYPE_SOL_SRV_UUID = 0x14, /* 设备16bit服务UUID */
BLE_AD_TYPE_128SOL_SRV_UUID = 0x15, /* 设备128bit服务UUI...