Enhanced For Loop Exception [duplicate]

Answer 1

for(int i = 0; i <= numbers.length; i++) should be

for(int i = 0; i < numbers.length; i++)

In java, arrays are 0 based indexing. It means that your first element should be accessed at the index 0 and obviously the last at the length of your array minus 1.

int tab[] = new int[3]; //tab of length 3
tab[0] = 11;
tab[1] = 24;
tab[2] = 5;

Here you access the last element by calling tab[2] or tab[tab.length-1], which is equivalent.

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Apologies, that was just a mistake in the code I put up in the question.

The problem is that you should do : System.out.print(i + ", "); You should read this and this about enhanced for loop.

The for statement also has another form designed for iteration through Collections and arrays This form is sometimes referred to as the enhanced for statement, and can be used to make your loops more compact and easy to read. To demonstrate, consider the following array, which holds the numbers 1 through 10:

int[] numbers = {1,2,3,4,5,6,7,8,9,10};

The following program, EnhancedForDemo, uses the enhanced for to loop through the array:

class EnhancedForDemo {
    public static void main(String[] args){
         int[] numbers = 
             {1,2,3,4,5,6,7,8,9,10};
         for (int item : numbers) {
             System.out.println("Count is: " + item);
         }
    }
}

In this example, the variable item holds the current value from the numbers array.

So item holds the current value from the numbers array and not the current index. That's why you get an IOOBE.

Answer 2

for(int i : numbers)
{
     System.out.print(numbers[i] + ", ");
}

i here is the elements in the array, not the indexes. It could be bigger than numbers.length.

For example, if numbers = {1,2,3,9} then i will be 1, 2, 3, 9. But its length is 4, so when you loop on the elements inside it, you're trying to do numbers[9] which exceeds its size.

You probably want to System.out.print(i + ", ");

Answer 3

for(int i : numbers)
{
    System.out.print(numbers[i] + ", ");
}

should be

   for(int i : numbers)
    {
        System.out.print(i + ", ");
    }

You don't need to use indexes in enhanced for-loop.