遍历一个字符串字母出现的次数

package Ch17;

import java.util.Map;
import java.util.HashMap;

import static javax.swing.UIManager.put;

/**
 * Created by liwenj on 2017/7/28.
 */
public class Test22 {
    public static void main(String[] args) {
        String temp = "asdfghklsd";
        char[] chars = temp.toCharArray();
        Map<Character, Integer> result = new HashMap<>();
        for (char c : chars) {
            boolean f=result.containsKey(c);
            if (f) {
                    Integer old=result.get(c);
                    result.put(c,old+1);
            } else {
                result.put(c,1);
            }
        }
        System.out.println(result);
    }
}

运行结果如下：