第 24 行：错误：类型不兼容：列表<string>不能转换成字符串</string>

Question

class Solution {
    public List<List<String>> groupAnagrams(String[] strs) {
        
        if(strs.length==0)
           return new ArrayList<>();
           
        Map<String,List<String>> anagrams=new HashMap<>();
        String anagram_key;
        
        for(String s:strs){
            char[] arr=s.toCharArray();
            Arrays.sort(arr);
            anagram_key=String.valueOf(arr);

            if(!anagrams.containsKey(anagram_key))
                anagrams.put(anagram_key,new ArrayList<>());

            anagrams.get(anagram_key).add(s);
        }
        
        List<String> resList=new ArrayList<>();

        for(Map.Entry<String,List<String>> _itr:anagrams.entrySet()){
            resList.add(_itr.get());
        }

        return resList;
    }
}

Was Expecting List Of String Array. Running fine on my Intellij Idea IDE but not on leet code

The Error shown on leetcode is as follows: Please Review + Any Effective Source To Learn More About Errors.

Line 24: error: incompatible types: List<String> cannot be converted to String
    resList.add(_itr.getValue());
                             ^
Line 27: error: incompatible types: List<String> cannot be converted to List<List<String>>
return resList;
       ^
2 errors

Answer 1

You last code section should look something like this:

List<List<String>> resList=new ArrayList<>();

for(Map.Entry<String,List<String>> _itr:anagrams.entrySet()){
    resList.add(_itr.getValue());
}

return resList;