给定一个字符串，求出不含重复字符的最长子串长度

举例

输入：abcabca
输出：3
输入：bbbb
输出：1
输入：pwwkew
输出：3

我的想法

package s;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
public class sss {
 public static void main(String[] args) throws IOException {
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   String str = br.readLine();
   int max=maxCountofString(str);
   System.out.println(max);
  
 }
 private static int maxCountofString(String str) {
  List<Integer> list=new ArrayList<>();
  HashMap<Integer,Integer> map1 = new HashMap<>();
  List<Integer> arrayList = new ArrayList<>();
  List<Integer> maxCount=new ArrayList<>();
  String b=str;
  int countOfTeam=0;
  while(b.length()>0) {
   arrayList.add(countOfTeam);
   list = getIndex(str,String.valueOf(b.charAt(0)));
   for(int j = 0;j<list.size();j++) {
    map1.put(list.get(j),countOfTeam);
   }
   b=b.replace(String.valueOf(b.charAt(0)),"");
   countOfTeam=countOfTeam+1;
  }
  for(int i=0;i<str.length();i++) {
   int m=i;
   int teamNumber=map1.get(i);
   int count=0;
   List<Integer> arrayList2 = new ArrayList<>();
   for(int j = 0;j<arrayList.size();j++) {
       arrayList2.add(arrayList.get(j));
   }
   while( arrayList2.indexOf(teamNumber)!=-1) {
    int indexOfteamNumber=arrayList2.indexOf(teamNumber);
    arrayList2.remove(indexOfteamNumber);
     count=count+1;
     m=m+1;
     if(m<str.length()) {
     teamNumber = map1.get(m);
   }
     }
   maxCount.add(count);
  }
 
  return(Collections.max(maxCount));
 }

 public static List<Integer> getIndex(String strings, String str){
     List<Integer> list=new ArrayList<>();
     int flag=0;
     while (strings.indexOf(str)!=-1){
         String aa= strings.substring(0,strings.indexOf(str)+str.length());
         flag=flag+aa.length();
         list.add(flag-str.length());
         strings=strings.substring(strings.indexOf(str)+str.length());`

反正能跑过去 hhhh