Most Common Word, Java

Most Common Word

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
/*
paragraph = "Bob hit a ball, the hit BALL flew far after it was hit."
banned = ["hit"]
Output: "ball"
*/
class Rextester
{  
    public static void main(String args[])
    {
        System.out.println(mostCommonWord("Bob. hit, ball",new String[]{"hit"}));
    }
    public static String mostCommonWord(String paragraph, String[] banned) {
        String[] tokens = paragraph.split("\\W");
        Set<String> set = new HashSet<>(Arrays.asList(banned));
        Map<String,Integer> map = new HashMap<>();

for(String token:tokens){
            if(token.length()<1) continue;
            String word = stripToken(token.toLowerCase());
            
            if(set.contains(word))
                continue;
            map.put(word, map.get(word)==null ? 1:map.get(word)+1 );
        }

Map.Entry<String,Integer> max = null;
        for(Map.Entry<String,Integer> entry:map.entrySet()){
            if(max==null || entry.getValue().compareTo(max.getValue()) > 0)
                max = entry;
        }
        return max.getKey();
    }

public static String stripToken(String token){
       if(token.length()<1)
            return null;
       
        char lastChar = token.toCharArray()[token.length()-1];
        if( lastChar>='a' && lastChar<='z')
            return token;

return token.substring(0, token.length()-1);
    }
}


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