list2 is the string arraylist, for example
[00110001, 11111111, 00000000,
I want to replace 4th character of each element in list2, that replacing
character store in
list3 so it will contain
[1, 0, 1, 1, 1]
Finally my arraylist list2 should look like
[00111001, 11110111, 00001000, 01001010, 00001000].
First, you have to note that
String is immutable. This means that you can't do this just by running any method on
list2.get(i). All string methods return new string values, but do not change the values of the original string.
So you have to use
list2.set( i, newValue ) to replace the previous string with a new string that you will construct.
Now, how do you construct value? You take the parts of the string that are not supposed to change, and stick the new character value between them:
String oldValue = list2.get(i); String newValue = oldValue.substring(0,3) + list3.get(i) + oldValue.substring(5);
You could do it something like: