Loops and arrays

Hi
I'm trying to write a loop that does the following :-
Takes an array of index values that applies to a string adds one to the value of the index and then returns the character in this position.
There are only four types of character within the string so I have tried to solve it with the following code:-
for (int i=0; i < indexa.length; i++)
    if(genome.charAt(indexa[i] + 1) == 'a')
        indexia[i] += indexa;
else if(genome.charAt(indexa[i] + 1) == 'c')
indexic[i] += indexa[i];
else if(genome.charAt(indexa[i] + 1) == 'g')
indexig[i] += indexa[i];
else if (genome.charAt(indexa[i] + 1) == 't')
indexit[i] += indexa[i];
I'm trying it this way but it does'nt seem to work - I've only succeeded in confusing myself - any tips would be much appreciated

Sorry, I should have explained it better.
The situation I've got is something like this:-
I've got a string that looks something like this
'aactgctcct'
next - I've got four different arrays, each corresponding to the index of each character a, c, t and g
so they look something like this
indexa = {0,1}
indexc = {2,5,7,8}
indext = {3,6,9}
indexg = {4}
I am presently stuck at the next part - for which I have to return the character that is to the immediate right of the index value in the string that was analysed initially.
e.g. for indexa ;
0 = a
1 = c
for indexc;
2 = t
5 = t
7 = c
8 = t
etc
I don't know if this makes my predicament any clearer - I'm a genetics student this java is very new to me - I'm kinda muddling through but this bit has got me stumped !!!

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