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class Solution {
  static String[][] wordCountEngine(String document) {
    Hashtable ht=new Hashtable();
    String words[]=document.split(" ");  //split sentence to words
    int largestcount=0;
    String word;
    for(int i=0;i<words.length;i++)
    { word=words[i].toLowerCase();      // ignoring case-sensitive by converting all 
                                        //  to lowercase
    List<character> li=new ArrayList<character>();
    for (char ch:word.tocharArray())
      if(ch>='a' && ch<='z')
        li.add(ch);                   //ignoring special characters like '@'and digits 
                                      //and adding it to list
    String s="";
    for(char ch:li)
      s=s+ch;                        //words without special characters and digits
    if(s.length()<1)
      continue;
    int count=0;
     
       while(document.contains(s))        //while words present in given sentence
       {    
            document=document.substring(document.indexOf(s)+s.length(),document.length()-1);
            count++;
        }
    else 
      count=1;
    if(count>largestcount)
      largestcount=count;
    //ht.put(s,count);  
  }


What I have tried:

After counting the words I'm not able to convert it into a list consisting of word and its occurrences and displaying them according to their descending order of occurrences.

Example
input:
Java
document = "Practice makes perfect. you'll only
                    get Perfect by practice. just practice!"

output:
Java
[ ["practice", "3"], ["perfect", "2"],
          ["makes", "1"], ["youll", "1"], ["only", "1"], 
          ["get", "1"], ["by", "1"], ["just", "1"] ]
Posted
Updated 12-Sep-18 21:43pm
v3

1 solution

Use a SortedMap (Java Platform SE 8 )[^] with the word being the key and the count being the value. If the Map does not contain the word then add it in, and set its value to 1. If the map does contain the key then just increment its value.
 
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Comments
Member 13954890 14-Sep-18 10:26am     CRLF
public class stringtowords { public static Hashtable<String, Integer> CountW(String s,String ss) { Hashtable<String,Integer> ht=new Hashtable(); int count=1; if(s.contains(ss)) { if(!ht.containsKey(ss)) { ht.put(ss,count); } else { count=count+1; } } return ht; } public static void main(String args[]) { Hashtable<String,Integer> hte=new Hashtable(); String s="hello! my my name@ is pragya"; String wo[]=s.split(" "); for(String w:wo) { System.out.println(w); } String word; for(int i=0;i<wo.length;i++) { word=wo[i].toLowerCase(); List<character> li=new ArrayList<character>(); for (char ch:word.toCharArray()) if(ch>='a' && ch<='z') li.add(ch); String ss=""; for(char ch:li) ss=ss+ch; hte=CountW(s,ss); System.out.println(hte); } } } but for each word it's printing 1 only I'm not getting where i'm going wrong.
Richard MacCutchan 14-Sep-18 10:49am     CRLF
1. You are using a HashTable rather than a SortedMap. 2. You are splitting your words into characters for some reason not mentioned in your question. All you need to do with a SortedMap is as follows: - convert the word to all lower case (if necessary). - if the lst already contains this word then add 1 to the value. - if the list does not contain the word, then add it as a new entry with a count of 1. - repeat for all words.
Member 13954890 14-Sep-18 12:57pm    
sir what's the difference between sortedmap and a hashtable?
Member 13954890 14-Sep-18 13:39pm     CRLF
public class dhshk { public static SortedMap<String, Integer> CountW(String s,String ss) { SortedMap<String,Integer> ht=new TreeMap<String,Integer>(); int count=1; if(s.contains(ss)) { if(!ht.containsKey(ss)) { ht.put(ss,count); } else { count=count+1; } } return ht; } public static void main(String args[]) { SortedMap<String,Integer> hte=new TreeMap<String,Integer>(); String s="hello! my my name@ is pragya"; String wo[]=s.split(" "); for(String w:wo) { System.out.println(w); } String word; for(int i=0;i<wo.length;i++) { word=wo[i].toLowerCase(); List<character> li=new ArrayList<character>(); for (char ch:word.toCharArray()) if(ch>='a' && ch<='z') li.add(ch); String ss=""; for(char ch:li) ss=ss+ch; hte=CountW(s,ss); System.out.println(hte); } } } Still i'm not getting the answer.

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