A. Compile-time
B. Run-time
C. Not an error
D. Not an exception at all
View Answer
Explanation:
The Array Index Out Of Bounds Exception: Why It Occurs and How to Fix It
You're writing some code, minding your own business, and suddenly—BAM!—you get hit with the Array Index Out Of Bounds Exception. (
- Your code didn't throw an exception? It was supposed to.
- What just happened?
- How can you fix it?
- What can you do to make sure it doesn't happen again?
The array index out-of-bounds exception occurs when your code tries to access an element in an array at an index that's either higher or lower than the array's actual size.
What is an array index out-of-bounds exception?
Array index out-of-bounds exceptions occur when we try to access an index in an array that is greater than the number of items in the array. This exception can be thrown by Java's built-in Arrays class, but also many other classes like java. util.ArrayList.
A common cause for this error is programming errors such as accidentally accessing an element beyond the bounds of an array or using a negative index in an array.
Causes of Array Index Out Of Bounds Exception
Array index out of bounds exceptions can occur when you add an item outside the array bounds, delete an item from the middle of the array, try to set an element of a mutable array beyond its current bounds, or read an element from a file that is past the end of the file. This error is also called Array index too large and Index in an input range, among other names.
Ways to fix this exception
There are a few different things that can cause the array index out-of-bounds exception, but the most common one is calling an index too high. For example, if you have a string that's 0 characters long, if you try to find B, it will go past the end of the string. The other thing is having an off-by-one error; this could happen if you're doing something like going through every word in a sentence and keeping track of where in the sentence each word starts.
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