找出单词中每个字母的数量

问题描述

用户将输入一个字符串，例如，如果用户输入YYYCZZZZGG:程序将评估字符串中字符的频率.对于YYYCZZZZGG字符串，仅C可见1，G重复2，Y的频率为3，Z的频率为4.

User will enter a String,For instance if the user enters YYYCZZZZGG:Program will evaluate the frequency of characters in the string.For YYYCZZZZGG string, C is seen only for 1, G is repeated 2, Y has a frequency of 3, and Z’s frequency is 4.

找到每个字母的编号后，如何使用输出的程序编号绘制条形图?

after finding number of each letter how can I draw a bar graph using the numbers of the programs output?

推荐答案

尝试一下:

public static void main(String[] args) {
    String input = "YYYCZZZZGG";
    Map<Character, Integer> map = new HashMap<Character, Integer>(); // Map
    // to store character and its frequency.
    for (int i = 0; i < input.length(); i++) {
        Integer count = map.get(input.charAt(i)); // if not in map
        if (count == null)
            map.put(input.charAt(i), 1);
        else
            map.put(input.charAt(i), count + 1);
    }
    System.out.println(map);
}

输出:

{G=2, C=1, Y=3, Z=4}

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