查询字符串中字母的个数

直接上代码咯 利用HashMap来统计即可~

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

public class ChooseCount {
    public static void main(String[] args){
        String str = "bbsdkkshfiefhk%$6783alsjda";
        countStrNumber(str);
    }

    private static void countStrNumber(String str) {
        Map<Character,Integer> map = new HashMap<Character,Integer>();
        for (int i = 0; i < str.length(); i++) {
            if (map.get(str.charAt(i))==null) {
                map.put(str.charAt(i), 1);
            }else {
                map.put(str.charAt(i), map.get(str.charAt(i))+1);
            }
        }

        // 迭代集合
        Iterator<Map.Entry<Character, Integer>> it = map.entrySet().iterator();
        while(it.hasNext()){
            Entry<Character, Integer> entry = it.next();
            System.out.print(entry.getKey()+"("+entry.getValue()+")");
        }
    }

}