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LengthOfLongestSubstring.java

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package Algorithms.string;

import java.util.HashMap;

public class LengthOfLongestSubstring {

public int lengthOfLongestSubstring(String s) {

if (s == null) {

return 0;

}

int len = s.length();

// The start of the window.

int start = 0;

int max = 0;

HashMap<Character, Integer> map = new HashMap<Character, Integer>();

for (int end = 0; end < len; end++) {

char c = s.charAt(end);

if (map.containsKey(c)) {

if (map.get(c) >= start) {

start = map.get(c) + 1;

}

}

//更新map里的char 的位置

map.put(c, end);

int subLen = end - start + 1;

max = Math.max(max, subLen);

}

return max;

}

}