大约有 48,000 项符合查询结果（耗时：0.0995秒） [XML]
How to check if the user can go back in browser history or not
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122
Short answer: You can't.
Technically there is an accurate way, which would be checking the pro...
Does hosts file exist on the iPhone? How to change it? [closed]
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Andrew BullockAndrew Bullock
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How do I escape the wildcard/asterisk character in bash?
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edited Nov 7 '19 at 22:05
Benjamin W.
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an...
What is the best collation to use for MySQL with PHP? [closed]
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625
The main difference is sorting accuracy (when comparing characters in the language) and perform...
What's the best way to cancel event propagation between nested ng-click calls?
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edited Oct 22 '13 at 15:40
answered Mar 4 '13 at 2:30
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How do I type using my keyboard on the iphone simulator?
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12 Answers
12
Active
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Why does Java's hashCode() in String use 31 as a multiplier?
...multiplication overflowed, information would be lost, as multiplication by 2 is equivalent to shifting. The advantage of using a prime is less clear, but it is traditional. A nice property of 31 is that the multiplication can be replaced by a shift and a subtraction for better performance: 31 * i ==...
Is it better to reuse a StringBuilder in a loop?
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The second one is about 25% faster in my mini-benchmark.
public class ScratchPad {
static String a;
public static void main( String[] args ) throws Exception {
long time = System.currentTimeMillis();
for( int i = 0; i <...
How to get just the parent directory name of a specific file
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edited Feb 2 '13 at 21:49
answered Nov 19 '11 at 20:39
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Nesting await in Parallel.ForEach
...to the TransformBlock.
In code:
var ids = new List<string> { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
var getCustomerBlock = new TransformBlock<string, Customer>(
async i =>
{
ICustomerRepo repo = new CustomerRepo();
return await repo.GetCustomer...