java字母出现次数小玩具

跟大家分享一个小玩具,
随意输入几个字母,enter之后,你就会看到字母a出现了几次,b出现了几次,诸如此类.

package rw3;

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

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("请随意输入几个英文字母:");
		String str = sc.next();
		char charInfo[] = str.toCharArray();//将输入的字母添加进charInfo字符数组中
		Map<Character, Integer> map = new HashMap<Character, Integer>();
		for (int i = 0; i < charInfo.length; i++) {
			if (map.containsKey(charInfo[i])) {
				map.put(charInfo[i], map.get(charInfo[i]) + 1);
			} else {
				map.put(charInfo[i], 1);
			}
		}
		System.out.println(map);
	}
}