java calculates the number of occurrences of the letter in a given string and the number of occurrences of that letter

This article shows how java calculates the number of occurrences of the letter in a given string and the number of occurrences of that letter. To share for your reference, specific as follows:

import Java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
public class TestStringSplict {
  public static void main(String[] args){
    String str = "aaaaaaaccccccccccccccccccccccaaaabb";
//    with map implementation 
//   TreeMap<Character,Integer> map = new TreeMap<Character,Integer>();
//   for(Character ch : str.toCharArray()){
//     if((ch>='a' && ch<'z')||(ch>'A' && ch<'Z')){
//       Integer count = map.get(ch);
//       map.put(ch, null==count?1:count+1);
//     }
//   }
//
//   System.out.println(Collections.max(map.values()));
    // Using ordinary arrays 
    int[] aa = new int[60];
    for(char temp:str.toCharArray()){
      if((temp>=65 && temp<=90)||(temp>=97 && temp<=122)){
        temp -= 65;
        aa[temp]++;
      }
    }
    int max = aa[0]; int position = 0;
    for(int i=0;i<aa.length;i++){
      if(aa[i]>max){
        max = aa[i]; position = i;
      }
    }
    System.out.println(max);
        System.out.println(" The letter "+(char)(position+65) + " appear " + max + " time ");
  }
}

PS: Here are some more online character statistics tools for your reference:

Online word count tool:
http://tools.ofstack.com/code/zishutongji

Online character Statistics and editing tools:
http://tools.ofstack.com/code/char_tongji

I hope this article has been helpful in java programming.