What is the difference between different for loops in Java?

To fix the issue you can do They're semantically the equivalent. (x;y;z) { foo; } is equivalent to x; while (y) { foo; z; }. They're not exactly equivalent in further versions of the standard, in the example of for (int x = 0; y; z), the scope of x is the for block and is out of scope after the loop ends, whereas with int x; while (y) x it's still in scope after the loop ends.
Another difference is that for interprets missing y as TRUE, whereas while must be supplied with an expression. for (;;) { foo; } is fine, but while() { foo; } isn not.

I wish did fix the issue. I don't know why you need underscore.js and jQuery for this. I've written a non-library version that compares:
100 loops of 10 loops of 1 call each (1,000 calls) 100 loops of 10 calls (1,000 calls) 200 loops of 5 calls (1.000 calls) 1,000 loops of 1 call (1,000 calls)

around this issue The first loop is about twice as fast as the second one, but in terms of the asymptotic time complexity they are the same:

O(N^2)

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wish of those help In the first snippet, all temp = data; does is change what the temp variable refers to - it doesn't modify any of the objects in the list.

+--+  +--+  +--+  +--+             temp->+--+         
|  |->|  |->|  |->|  |->null             |  |
+--+  +--+  +--+  +--+             data->+--+

             temp---+
                    V 
+--+  +--+  +--+  +--+             
|  |->|  |->|  |->|  |-------->+--+   
+--+  +--+  +--+  +--+         |  |
                         data->+--+

Any of those help In your for loop you are only setting bytesRead once, not every iteration like you do in the while. The for-equivalent of your while loop would be:

for( int bytesRead; (bytesRead = fileInputStream.read(buffer)) != -1; )

for( int bytesRead = fileInputStream.read(buffer); bytesRead != -1; bytesRead = fileInputStream.read(buffer) )