collection-based for loop

Can somebody explain to me why only the first code snippet is valid?

int[] a={2,3,5,7};

for(int i : a) System.out.println(i);

int[] a={2,3,5,7};

int i;

for(i : a) System.out.println(i);

[544 byte] By [kulkuria] at [2007-11-26 21:51:35]

# 1

Why shouldn't it be? You declare an array, and you iterate over it using the new for loop and a variable declared in the loop's head...

# 2

By the way, I don't see any collection anywhere.

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