使用string.split时的ArrayIndexOutOfBounds

Question

This problem has kept me frustrated for a few days now. I am using string split to find the second half of a string. Here is my code:

   String pieces[] = piece.split(before[x]);
   piece = piece.split(before[x])[1];

In debug mode i have determined that piece =

<area shape="circle" coords="329,152,13" href="#g35" alt="" onmouseover="return overlib\('&lt;b>Southeast False Creek&lt;/b>&lt;br>215 West 1st Avenue' , SNAPX, 20, SNAPY, 20\);" onmouseout="return nd\(\);"/>

and before[x] =

<area shape="circle" coords="329,152,13" href="#g35" alt="" onmouseover="return overlib\('&lt;b>

For some reason I am getting an ArrayIndexOutOfBounds exception with split saying an index of one is invalid. I dont know why this is happening so any help would be greatly appreciated!

Answer 1

If you are trying to get the second half of the string useing piece.split(before[x])[1] and its throwing an exception, then obviously it means that your string array piece.split(before[x]) does not have a second element. What you should do is try using piece.split(Pattern.quote(before[x])) and then check the number of strings in the array. If its more than 1 then you can get the 2nd half of the string using piece.split(Pattern.quote(before[x]))[1] .

Read this for more details http://docs.oracle.com/javase/1.5.0/docs/api/java/util/regex/Pattern.html#quote(java.lang.String )

Answer 2

String.split use regular expression to split String into pieces. "before[x]" contains regular special characters (ie "\\"), so you need to escape these special characters. refer http://www.regular-expressions.info/reference.html for special character lists