Radix Sort for Type Chars

Question

I have a code for sorting Radix Sort of type Interger but im not sure how to modify it to sort Characters. This is my code for type Int:
import java.util.ArrayList;
import java.util.Iterator;
public class RadixSort {
    private static final int RADIX = 10;
    private ArrayList[] buckets = new ArrayList[RADIX];
    public RadixSort() {
        for( int i = 0 ; i < RADIX; i++ ) {
            buckets[i] = new ArrayList();
        clearBuckets();
    private void clearBuckets() {
        for( int i = 0 ; i < RADIX; i++ ) {
            buckets.clear();
private boolean distribute( Integer[] array, int position ) {
// build the divisor
int divisor = 1;
while( position >= 1 ) {
divisor *= RADIX;
position--;
boolean done = true;
for( int i = 0 ; i < array.length; i++ ) {
int val = (array[i].intValue()/divisor);
if ( val != 0 ) done = false;
int bin = val % RADIX;
buckets[bin].add( array[ i ] );
return done;
private void collect( Integer[] array ) {
int index = 0; // next available position in array
for( int i = 0 ; i < RADIX; i++ ) {
Iterator<Integer> it = buckets[i].iterator();
while( it.hasNext() ) {
array[ index ] = it.next();
it.remove();
index++;
// what happens if this removed?
if ( index >= array.length ) return;
public void sort( Integer[] array ) {
clearBuckets(); // is this necessary?
int position = 0;
boolean done;
do {
done = distribute( array, position );
position++;
collect( array );
} while ( !done );

Answer 1

As in the maximum size of a string?
Do you mean characters or actual byte size?