How to increase the size of a String[]

I'm using a String[] variable that I do not know the maximal size, but i need to increase its size, how can I do that
ex:
String[] buffer = new String[]
int i= 0;
while (<condition>) {
???? // increase the size
buffer [ i ] =.....
}

There is no way in Java to actually increase or decrease the size of an existing array. You'll have to create a new array of the appropriate size and copy elements of the first array into it, for example by using System.arraycopy.
Or you could give your array a big enough size at start, so you won't have to do the above.
A better idea would be to use a collection instead of an array (like an ArrayList) in the first place.

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