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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		TreeMap<String,Integer> hm = null;
		hm = new TreeMap<String,Integer>(new Comparator<String>(){
                 public int compare(String o1, String o2){
                        return hm.get(o1).compareTo(hm.get(o2));
                 }
            });
	}
}

Main.java:15: error: local variables referenced from an inner class must be final or effectively final
                        return hm.get(o1).compareTo(hm.get(o2));
                               ^
Main.java:15: error: local variables referenced from an inner class must be final or effectively final
                        return hm.get(o1).compareTo(hm.get(o2));
                                                    ^
2 errors

Standard output is empty