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# Checking out of bound exception

THing is I have an assignment where the object is an array, I need to check when it is out of bound. But I dont understand what this statement means? Can you guys help me verify it?

method "private void rangeCheck(int index)": if the value of index is less than 0 or greater than or equal to the size of the dynamic array, then throw new exception IndexOutOfBoundsException("Index: " + index + ", Size: " + size);

at the part if the value of index is less than 0 or greater than or equal to size of dynamic array. So he doesnt mean the index, but the value inside that index, right?

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RozenKristal
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Got this part working :)

RozenKristal
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an array, I need to check when it is out of bound

The valid indexes for an array range from 0 to the length of the array-1.
See this page in the tutorial: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

NormR1
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can you explain what you did to make it work?

jamesmadison43
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can you explain what you did to make it work?

Please read NormR1 link. The index range of an array can be from 0 up to n-1 where n is the size of the array. For example, array size 5 is declared as `int[] arr = new int[5];` will have valid indices of 0 up to 4. The range is supposed to check for the incoming index value. The index will be out or range if the value is less than 0 or equal to or greater than the size of the index.

Taywin
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thanks

jamesmadison43
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