Run time error, why?

Question

I have next run time error (string index out of range: -2) when running below code. Why?
String singleLine=" ";
int endTableIndex=0;
for( int j=1; j<=3; j++ )
for( int i=0; i<100; i++ )
if( text.charAt(i) == 'x' )
if( text.charAt(i+1) == 'x' )
singleLine = text.substring(endTableIndex, i);
endTableIndex = i+2;
System.out.println( singleLine );
Message was edited by:
aditm

Answer 1

1) Please use code tags. You've posted here before so by now, you should know the rules. Without tags, your code is difficult to read, so most will not bother to read it.
2) What defines the limit -- length -- or size of your "array" of characters in your string, text?
3) Use this limit above rather than some arbitary or magic number like "100" in your for loop. Be careful when you look at charAt(i + 1). This may make you go out of range if you don't set your limit with care.