UVA - 10062 - Tell me the frequencies!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {

    public static void main(String[] args) throws IOException {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        StringBuffer sb = new StringBuffer("");
        String m = "";
        StringBuilder temp = new StringBuilder("");
        boolean flag=false;
        while ((m = br.readLine()) != null) {
            if(flag)
                sb.append("\n");
            Freq[] arr=new Freq[97];
             for(int i=0;i<97;i++){
                 arr[i]=new Freq(0, (char)(i+31));
             }
            for(int i=0;i<m.length();i++){
                arr[m.charAt(i)-31].inc();
            }
            Arrays.sort(arr);
            for(int i=0;i<arr.length;i++){
                if(arr[i].getX()>0){
                    sb.append(arr[i].getC()).append(" ").append(arr[i].getX()).append("\n");
                }
            }
            flag=true;
        }
        System.out.print(sb);
    }
}
class Freq implements Comparable<Freq>{
    int x=0;
    char c=0;

    public Freq(int num,char temp) {
        x=num;
        c=temp;
    }
  
    public void inc(){
        x++;
    }

    public int getC() {
        return c;
    }

    public int getX() {
        return x;
    }
  
    @Override
    public int compareTo(Freq o) {
        if(x>o.getX())
            return 1;
        else if(x==o.getX()){
            if(c>o.getC())
             return -1;
            else
             return 1;
        }
        return -1;
    }
  
}