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Number of lines in a file in Java
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Benchmark resuls for a 1.3GB text file, y axis in seconds. I've performed 100 runs with the same file, and measured each run with System.nanoTime(). You can see that countLinesOld has a few outliers, and countLinesNew has none and while it's only a bit faster, the difference is statistically signif...
SparseArray vs HashMap
...ere is an example of SparseIntArray vs HashMap<Integer, Integer> for 1000 elements:
SparseIntArray:
class SparseIntArray {
int[] keys;
int[] values;
int size;
}
Class = 12 + 3 * 4 = 24 bytes
Array = 20 + 1000 * 4 = 4024 bytes
Total = 8,072 bytes
HashMap:
class HashMap<K, V...
Is Redis just a cache?
... for the most recent 25 questions.
$ lrange questions 0 24
1) "question:100"
2) "question:99"
3) "question:98"
4) "question:97"
5) "question:96"
...
25) "question:76"
Now that you have the ids, retrieve items from Redis using pipelining and show them to the user.
Questions by Tags, Sorted by V...
Uses of content-disposition in an HTTP response header
....FileName = "myFile.txt";
cd.ModificationDate = DateTime.UtcNow;
cd.Size = 100;
Response.AppendHeader("content-disposition", cd.ToString());
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How can I modify the size of column in a MySQL table?
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@Flimm - just a pointer, if you have a VARCHAR(100) and you change it to VARCHAR(50) it will cut any existing data from columns. As per this specific question though, making a column larger won't have an issue with the data.
– Warren Sergent
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How to round the minute of a datetime object
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See this to understand the problem: datetime.timedelta(100,1,2,3).seconds == 1
– CPBL
Dec 8 '16 at 18:49
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How to implement a Map with multiple keys? [duplicate]
... This requires two look ups for every value access, which is a 100 % performance penalty.
– ceving
Mar 15 '13 at 15:40
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How to conclude your merge of a file?
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@johndpope power("tnx", 100)
– knagode
Feb 17 '14 at 12:50
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correct way to use super (argument passing)
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edited Jan 23 '12 at 19:40
answered Jan 23 '12 at 14:39
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how do I insert a column at a specific column index in pandas?
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JeffJeff
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