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Weird Integer boxing in Java
...atch
{
public static void main(String[] args)
{
Integer a = 1000, b = 1000; //1
System.out.println(a == b);
Integer c = 100, d = 100; //2
System.out.println(c == d);
}
}
Output:
false
true
Yep the first output is produced for comparing reference; 'a'...
jQuery on window resize
... ,"f50" : function(){ alert(50); }
,"f100" : function(){ alert(100); }
,"f500" : function(){ alert(500); }
,"f1000" : function(){ alert(1000);}
};
//---------------------
$(wi...
jQuery document.createElement equivalent?
...benchmark, and here are roughly the results of repeating the above options 100,000 times:
jQuery 1.4, 1.5, 1.6
Chrome 11 Firefox 4 IE9
<div> 440ms 640ms 460ms
<div></div> 420ms 650ms 480ms
createElement 100ms 180ms 300m...
How to load images dynamically (or lazily) when users scrolls them into view
...p; $(this).offset().top < ($(window).scrollTop() + $(window).height() + 100) ) {
var source = $(this).data('src');
$(this).attr('src', source);
$(this).removeAttr('data-src');
}
})
})
Sample html code
<div>
<img src="" data-src="path...
How is a CRC32 checksum calculated?
...ia
CRC calculation
Or in hex and binary:
0x 01 04 C1 1D B7
1 0000 0100 1100 0001 0001 1101 1011 0111
The highest term (x32) is usually not explicitly written, so it can instead be represented in hex just as
0x 04 C1 1D B7
Feel free to count the 1s and 0s, but you'll find they match u...
How does a hash table work?
... above, each of the 300 filing cabinet would (statistically) contain about 100 records. Searching (regardless the order) through 100 records is much faster than having to deal with 30,000.
You may have noticed that some actually already do this. But instead of devising a hashing methodology to ge...
Tools for making latex tables in R [closed]
...lt;-data.frame(animal=sample(c("elephant", "dog", "cat", "fish", "snake"), 100,replace=TRUE),
colour=sample(c("red", "blue", "green", "yellow"), 100,replace=TRUE),
size=rnorm(100,mean=500, sd=150),
age=rlnorm(100, meanlog=3, sdlog=0.5))
#generate a table
...
Iterating over a numpy array
...performance. It is a bit slower than a list comprehension.
X = np.zeros((100, 100, 100))
%timeit list([((i,j,k), X[i,j,k]) for i in range(X.shape[0]) for j in range(X.shape[1]) for k in range(X.shape[2])])
1 loop, best of 3: 376 ms per loop
%timeit list(np.ndenumerate(X))
1 loop, best of 3: 570 ...
Generating a Random Number between 1 and 10 Java [duplicate]
... try something like this.
Random rn = new Random();
for(int i =0; i < 100; i++)
{
int answer = rn.nextInt(10) + 1;
System.out.println(answer);
}
Also if you change the number in parenthesis it will create a random number from 0 to that number -1 (unless you add one of course like you ...
window+nginx+php-cgi的php-cgi线程/子进程问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...会是a.php+b.php,而不是并行,是串行时间了.
如a.php
sleep(100);echo 1;
b.php
echo 2;
先执行a.php,100秒后输出1.在执行a.php的同一时候,执行b.php,2却出如今100秒以后.如果...却不是一执行就立马出现,由于上面的配置受影响导致解析是串行...