java 字符串的完美度

package com.mytest;import java.io.IOException;import java.lang.reflect.Array;import java.math.BigDecimal;import java.text.DecimalFormat;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.Hashtable;import java.util.Iterator;import java.util.LinkedList;import java.util.List;import java.util.Set;import java.util.TreeMap;import java.util.TreeSet;import java.util.regex.Matcher;import java.util.regex.Pattern;import net.sourceforge.sizeof.SizeOf;public class Test {   public static int perfect(String s) {        HashMap<Character,Integer> map = new HashMap<Character,Integer>();            for(int i=0;i<s.length();i++){                char c = s.charAt(i);                map.put(c,map.get(c)==null?1:map.get(c)+1);            }                    char[]  array_char = new  char[map.size()];            int[]  array_count = new  int[map.size()];            Set<Character> a = map.keySet();            Iterator<Character> it  = a.iterator();            int index = 0;            while(it.hasNext()) {                char ch = it.next();                array_char[index]  = ch;                array_count[index] = map.get(ch);                index++;            }                        //从高到底进行设置完美度            int maxValue = 26;            //将最大的放到最后                        int result = 0;            for(int i=0;i<array_count.length;i++) {                                for(int j=0;j<array_count.length-i;j++){                    int temp = array_count[i];                    if(temp>array_count[j]){                                                array_count[i] = array_count[j];                        array_count[j] = temp;                    }                }                result += array_count[array_count.length-1]*maxValue;                                maxValue--;            }        return result ;    }        //start 提示：自动阅卷起始唯一标识，请勿删除或增加。     public static void main(String args[])     {         String str = "df";                int res = perfect(str);                System.out.println(res);    }     //end //提示：自动阅卷结束唯一标识，请勿删除或增加。}