Run Length Coding

RunLengthCoding.java

import java.util.*;
import java.lang.*;
import java.io.*;

class RunLengthCoding
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String s = "aaabbbccc";
	    LinkedHashMap<Character,Integer> hm=new LinkedHashMap<>();
	    for(int i=0;i<s.length();i++)
	    {
	       hm.compute(s.charAt(i), (key, val) -> {
               if (val == null) {
                   return 1;
               } else {
                   return val + 1;
               }
           }); 
	    }
	    
	    for (Map.Entry<Character, Integer> entry : hm.entrySet()) {
          System.out.print(entry.getKey()+""+entry.getValue());
       }

	}
}