{"id":34536,"date":"2023-03-22T12:34:26","date_gmt":"2023-03-22T07:04:26","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-what-causes-a-java-lang-arrayindexoutofboundsexception-and-how-do-i-prevent-it\/"},"modified":"2023-03-22T12:34:26","modified_gmt":"2023-03-22T07:04:26","slug":"solved-what-causes-a-java-lang-arrayindexoutofboundsexception-and-how-do-i-prevent-it","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-what-causes-a-java-lang-arrayindexoutofboundsexception-and-how-do-i-prevent-it\/","title":{"rendered":"[Solved] What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?"},"content":{"rendered":"

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Your first port of call should be the documentation<\/a> which explains it reasonably clearly:<\/p>\n

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Thrown to indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array.<\/p>\n<\/blockquote>\n

So for example:<\/p>\n

int[] array = new int[5];\nint boom = array[10]; \/\/ Throws the exception\n<\/code><\/pre>\n
As for how to avoid it… um, don’t do that. Be careful with your array indexes.<\/p>\n
One problem people sometimes run into is thinking that arrays are 1-indexed, e.g.<\/p>\n
int[] array = new int[5];\n\/\/ ... populate the array here ...\nfor (int index = 1; index <= array.length; index++)\n{\n    System.out.println(array[index]);\n}\n<\/code><\/pre>\n
That will miss out the first element (index 0) and throw an exception when index is 5. The valid indexes here are 0-4 inclusive. The correct, idiomatic for<\/code> statement here would be:<\/p>\n
for (int index = 0; index < array.length; index++)\n<\/code><\/pre>\n
(That’s assuming you need<\/em> the index, of course. If you can use the enhanced for loop instead, do so.)<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            5<\/span> <\/p><\/div>\n<\/div>\n
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solved What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? <\/p>\n","protected":false},"excerpt":{"rendered":"
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