Longest Run - Sequence of the same character

I want to return the letter that has the longest run in String s. How would i do that.
For example...in "aaabbbbcc"....b would be the result...plz help
Here's my code...but something's wrong with it:
import java.io.*;
import javax.swing.*;
import java.lang.String;
public class StringInfo1 {
public static char longestRun(String s) {
String letter=null;
int num1Letter=0;
int num2Letter=0;
for (int i=0; i != s.length()-1 && s.length() > 0; i++) {
if (s.charAt(i) == s.charAt(i+1)) {
num1Letter=num1Letter+1;
else {
num2Letter=num1Letter;
num1Letter=0;
letter=s.charAt(num1Letter);
return letter(s.charAt(num1Letter));

y doesn't this work

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