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how to find the repeated words

Posted on 2010-09-02
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Last Modified: 2012-06-27
sir,
    i m want to know  in a paragraph contains no of words like india ,pak anything. im want to know  if india repeat 4 times it will print first,if  pak repeat 3 times it will print next place to india.im want program for this concept.to align words in priority level.
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Question by:sunda2010
3 Comments
 

Expert Comment

by:maxmetallica
ID: 33593747
You can use the org.apache.commons.lang.StringUtils class which contains many methods for string manipulation and its easier to use too.
I will write a simple program to find the word occurance...
import org.apache.commons.lang.StringUtils;
 public class word_count
{    
    public static void main(String[] args)
    {
    String string = "hello world and hello people";    
    System.out.println(StringUtils.countMatches(string,"hello")
+ " occurrences of the word 'hello' in '" + string +
                "' is found.");
    }
}
this program gives output of "2" since the word hello occurs twice.
As per ur program,use a simple sorting after this to display the occurance in descending order..Thats it!



http://www.carfab.com/apachesoftware//commons/lang/binaries/commons-lang-2.5-bin.zip
public class word_count 
{    
    public static void main(String[] args)
    {
    String string = "hello world and hello people";    
    System.out.println(StringUtils.countMatches(string,"hello")
+ " occurrences of the word 'hello' in '" + string +
                "' is found.");
    }
}

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LVL 10

Expert Comment

by:himanshut
ID: 33593750
This will count number of characters been repeated.
If you initialize string array instead of char array then it will read the words instead + you need to you the delimiter SPACE to differentiate between two words.
import java.io.*;
import java.util.*;

class  CountCharacters {
  public static void main(String[] args) throws Exception{
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  System.out.print("Please enter string ");
  System.out.println();
  String str=br.readLine();
  String st=str.replaceAll(" ", "");
   
  char[]third =st.toCharArray();
  for(int counter =0;counter<third.length;counter++){
  char ch= third[counter];
  int count=0;
  for ( int i=0; i<third.length; i++){
  if (ch==third[i])
  count++;
}
boolean flag=false;
for(int j=counter-1;j>=0;j--){
if(ch==third[j])
flag=true;
}
if(!flag){
System.out.println("Character :"+ch+" occurs "+count+" times ");
}
}
}
}

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Accepted Solution

by:
__geof__ earned 500 total points
ID: 33594492
I have a solution that seems to work. It reads from the command line now but small changes to get input from file. It has an CustomEntry class that is comparable and a main to run the program.
###
### CustomEntry class that implements comparable to be able to sort it afterwards and a method to change a Map to a List of CustomEntry
###

public class CustomEntry implements Comparable {

    private Map.Entry entry;

    public CustomEntry(Map.Entry entry) {
        this.entry = entry;
    }

    public Map.Entry getEntry() {
        return this.entry;
    }

    public int compareTo(CustomEntry anotherEntry) {
        Integer thisIntegerVal = (Integer) (this.getEntry().getValue());
        int thisVal = thisIntegerVal.intValue();
        Integer anotherIntegerVal = (Integer) (anotherEntry.getEntry().getValue());
        int anotherVal = anotherIntegerVal.intValue();
        return (thisVal < anotherVal ? 1 : (thisVal == anotherVal ? 0 : -1));
    }

    public int compareTo(Object o) {
        return compareTo((CustomEntry) o);
    }

    public static List<CustomEntry> convertMapToList(Map map) {
        List<CustomEntry> list = new ArrayList();
        Set entrySet = map.entrySet();
        Iterator iterator = entrySet.iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            CustomEntry customEntry = new CustomEntry(entry);
            list.add(customEntry);
        }
        return list;
    }
}


###
### The main method that creates the Map from the string than get it sorted and printing them
###

    public static void main(String[] args) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Please enter string: ");
        HashMap<String, Integer> wordCount = new HashMap<String, Integer>();
        try {
            String str = br.readLine();
            String[] words = str.split(" ");
            for(String word:words){
                if(wordCount.containsKey(word)){
                    Integer i = wordCount.get(word) + 1;
                    wordCount.remove(word);
                    wordCount.put(word, i);
                }else{
                    wordCount.put(word, 1);
                }
            }
            List l = CustomEntry.convertMapToList(wordCount);
            Collections.sort(l);
            for(int i = 0; i < l.size(); i++){
                CustomEntry entry = (CustomEntry) l.get(i);
                System.out.println(entry.getEntry().getKey() + " occured " + entry.getEntry().getValue() + " times");
            }
        } catch (IOException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

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