给定字符串str1和str2，求str1中子串含有str2所有字符的最小子串长度

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/** * Created by lxw, liwei4939@126.com on 2017/11/1. * 给定字符串str1和str2，求str1中子串含有str2所有字符的最小子串长度 */public class minSubstring {    public int minLength(String str1, String str2){        if(str1 == null || str2 ==null || str1.length() < str2.length()){            return 0;        }        char[] chas1 = str1.toCharArray();        char[] chas2 = str2.toCharArray();        int[] map = new int[256];        for (int i=0; i< chas2.length; i++){            map[chas2[i]]++;        }        int left= 0;        int right = 0;        int minLen =Integer.MAX_VALUE;        int match =chas2.length;        while (right != chas1.length){            map[chas1[right]]--;            if(map[chas1[right]] >= 0){                match--;            }            if(match == 0){                while (map[chas1[left]] < 0){                    map[chas1[left++]]++;                }                minLen = Math.min(minLen, right - left + 1);                match++;                map[chas1[left++]]++;            }            right++;        }        return minLen == Integer.MAX_VALUE ? 0 :minLen;    }    public static void main(String[] args){        minSubstring tmp = new minSubstring();        String str1 = "abcde";        String str2 = "ac";        System.out.println(tmp.minLength(str1, str2));        String str3 = "12345";        String str4 = "344";        System.out.println(tmp.minLength(str3, str4));    }}

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