Sorting the Sentence

Sorting the Sentence

class Solution {
    public String sortSentence(String s) {
        String[] arr = s.split(" ");
        String[] res = new String[arr.length];
        
        String fa = "";
        for(int i=0;i<arr.length;i++)
        {
            String str = arr[i];
            String toAdd = "";
            
            for(int j=0;j<str.length();j++)
            {
                char ch = str.charAt(j);
                if(Character.isDigit(ch))
                {
                    int idx = ch - '0' -1;
                    res[idx] = toAdd;
                }
                else{
                    toAdd+=ch;
                }
            }
        }
        
        for(int i=0;i<res.length;i++)
        {
            fa+=(i==res.length - 1)?res[i]:res[i]+" ";
        }
        
        return fa;
    }
}