Finding repeated words on a string and counting the repetitions

Question

I need to find repeated words on a string, and then count how many times they were repeated. So basically, if the input string is this:

String s = \"House, House         


        

Answer 1

As mentioned by others use String::split(), followed by some map (hashmap or linkedhashmap) and then merge your result. For completeness sake putting the code.

import java.util.*;

public class Genric
{
    public static void main(String[] args) 
    {
        Map unique = new LinkedHashMap();
        for (String string : "House, House, House, Dog, Dog, Dog, Dog".split(", ")) {
            if(unique.get(string) == null)
                unique.put(string, 1);
            else
                unique.put(string, unique.get(string) + 1);
        }
        String uniqueString = join(unique.keySet(), ", ");
        List value = new ArrayList(unique.values());

        System.out.println("Output = " + uniqueString);
        System.out.println("Values = " + value);

    }

    public static String join(Collection s, String delimiter) {
        StringBuffer buffer = new StringBuffer();
        Iterator iter = s.iterator();
        while (iter.hasNext()) {
            buffer.append(iter.next());
            if (iter.hasNext()) {
                buffer.append(delimiter);
            }
        }
        return buffer.toString();
    }
}

New String is Output = House, Dog

Int array (or rather list) Values = [3, 4] (you can use List::toArray) for getting an array.