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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
	{
		// your code goes here
 
		String s = "BLOOMBERG";
		Map<Character, Integer> map = new HashMap<>();
		for(char c : s.toCharArray()){
			map.put(c, getOrDefault(c, 0));
		}
 
		private class CharacterCount{
			Character c;
			int count;
			public CharacterCount(Character c, int count){
				this.c = c;
				this.count = count;
			}
		}
		List<CharacterCount> list = new ArrayList<>();
		for(char c : s.toCharArray()){
			list.add(new CharacterCount(c,map.get(c)));
		}
 
		Collections.sort(list, new Comparator<CharacterCount>{
			public int compare(CharacterCount a, CharacterCount b){
				return a.count == b.count ? a.compareTo(b): a.count - b.count; 
			}
		});
 
		StringBUilder sb = new StringBuilder();
		for(CharacterCount item : list){
			sb.append(item.c);
		}
 
		System.out.println(sb.toString());
	}
}

Main.java:20: error: illegal start of expression
		private class CharacterCount{
		^
Main.java:33: error: '(' or '[' expected
		Collections.sort(list, new Comparator<CharacterCount>{
		                                                     ^
Main.java:33: error: ';' expected
		Collections.sort(list, new Comparator<CharacterCount>{
		                                                      ^
Main.java:34: error: ';' expected
			public int compare(CharacterCount a, CharacterCount b){
			                  ^
Main.java:34: error: ';' expected
			public int compare(CharacterCount a, CharacterCount b){
			                                                   ^
Main.java:34: error: not a statement
			public int compare(CharacterCount a, CharacterCount b){
			                                                    ^
Main.java:34: error: ';' expected
			public int compare(CharacterCount a, CharacterCount b){
			                                                     ^
Main.java:37: error: illegal start of type
		});
		 ^
Main.java:40: error: illegal start of type
		for(CharacterCount item : list){
		^
Main.java:40: error: ')' expected
		for(CharacterCount item : list){
		                       ^
Main.java:40: error: <identifier> expected
		for(CharacterCount item : list){
		                              ^
Main.java:44: error: <identifier> expected
		System.out.println(sb.toString());
		                  ^
Main.java:44: error: <identifier> expected
		System.out.println(sb.toString());
		                              ^
Main.java:44: error: ';' expected
		System.out.println(sb.toString());
		                               ^
Main.java:44: error: illegal start of type
		System.out.println(sb.toString());
		                                ^
Main.java:44: error: <identifier> expected
		System.out.println(sb.toString());
		                                 ^
Main.java:44: error: ';' expected
		System.out.println(sb.toString());
		                                  ^
17 errors

Standard output is empty