Main003.java

public class Main003 {
 
 public static void main(String[] args){
 System.out.println(new Main003().lengthOfLongestSubstring("audaudf"));
 }
 
 

 public int lengthOfLongestSubstring(String s) {
 int[] chars = new int[256];
 
 int start = 0;
 
 if (s.length() <= 0){
 return 0;
 }
 
 int maxLen = 1;
 int i = 0;
 for (i = 0; i < s.length(); i++){
 int ch = (int) s.charAt(i);
 if (chars[ch] != 0){
 if (i - start > maxLen){
 maxLen = i - start;
 }
 start = start+1;
 i = start;
 chars = new int[256];
 chars[s.charAt(start)] = 1;
 }else {
 chars[ch] = 1; 
 }
 }
 
 if (i - start > maxLen){
 maxLen = i - start;
 }
 return maxLen;
 }
}