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Enhansed For Loop Please explain me

Ami Ambre
Ranch Hand

Joined: Dec 26, 2007
Posts: 58
int [][]i={{1,2,3},{4,5,6}};
for (int []n: i)
/*This is single dimensional Array so how can you are accessing multi dimensional Arrays within Single dimensional Array.*/

for(int n2: i[2])
// what is this?
Jamie MacDonald

Joined: May 17, 2008
Posts: 20
The enhanced for loop is in the form of
for( declaration : expression ) { }
declaration declares a new variable (which typically will be used in the for loop)
expression must evaluate to an array of the type of the variable declared in declaration

In your first example, n is declared as a single dimensional array and the expression is a two dimensional array--which is an array of single dimensional arrays--so this meets the enhanced for loop specification.

In the second example, the expression "i[2]" is a single dimensional int array and n2 is an int, so again you are fine as far as the compiler is concerned. You will however get a runtime exception (ArrayIndexOutOfBoundsException) since i is only of length 2 (contains 2 int arrays) and therefore the maximum array index is 1.
I agree. Here's the link:
subject: Enhansed For Loop Please explain me
jQuery in Action, 3rd edition