10424 - Love Calculator - Java

 package org.goro.uva.m;  
 import java.io.*;  
 import java.math.RoundingMode;  
 import java.text.NumberFormat;  
 import java.util.*;  
 public class LoveCalculator {  
      public static char[] ch_name1 = new char[25];  
      public static char[] ch_name2 = new char[25];  
      public static void main(String[] args) throws Exception {  
 //          InputStreamReader isr = new InputStreamReader(new FileInputStream(new File("input.in")));  
           InputStreamReader isr = new InputStreamReader(System.in);  
           BufferedReader br = new BufferedReader(isr);  
           StringBuilder sb = new StringBuilder("");  
           String name1;  
           String name2;  
           while ((name1 = br.readLine()) != null) {  
                name2 = br.readLine();  
                name1 = name1.toLowerCase();  
                name2 = name2.toLowerCase();  
                ch_name1 = name1.toCharArray();  
                ch_name2 = name2.toCharArray();  
                int val1 = calculate(ch_name1);  
                int val2 = calculate(ch_name2);  
                if(val1 < val2) {  
                     val1 ^= val2;  
                     val2 ^= val1;  
                     val1 ^= val2;  
                }  
                float propo = 0;  
                if( val1 != 0 ) propo = (float)val2 / (float)val1;  
                propo *=100;  
                sb.append(round(propo, 2)).append(" %\n");  
           }  
           System.out.print(sb);  
      }  
      static public String round(double d, int ic) {  
            NumberFormat nf = NumberFormat.getInstance();  
            nf.setMaximumFractionDigits(ic);  
            nf.setMinimumFractionDigits(ic);  
            double tmp = Double.parseDouble((nf.format(d)).replaceAll(",", ".").replaceAll(" ", "") );  
            String temp = Double.toString(tmp);  
            if(temp.endsWith(".0")) return temp + "0";  
            else return temp;  
      }  
      public static int calculate(char[] arr) {  
           int retVal = 0;  
           for(int i = 0; i < arr.length; i++) {  
                if(arr[i] >= 'a' && arr[i] <= 'z') retVal += arr[i] - 'a' + 1;  
           }  
           return add(retVal);  
 //          return retVal;  
      }  
      public static int add(int val) {  
 //          System.out.println("running: " + val);  
           String tmp = Integer.toString(val);  
 //          System.out.println("String: " + tmp + "lenght:" + tmp.length());  
           int retVal = 0;  
           for(int i = 0; i < tmp.length(); i++) {  
                retVal += (tmp.charAt(i) - '0');  
 //               System.out.println(tmp.charAt(i));  
           }  
 //          System.out.println("got: " + retVal);  
           if(retVal > 9) return add(retVal);  
           else return retVal;  
      }  
 }