统计字符串中每个字母的个数

最新推荐文章于 2022-07-10 21:43:38 发布

转载最新推荐文章于 2022-07-10 21:43:38 发布 · 973 阅读

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本文介绍了一个简单的Java程序，该程序可以接收用户输入的一串文本，并统计出每个英文字母出现的次数。通过使用`Scanner`类读取用户输入的字符串，程序能够有效地遍历每个字符并统计大小写字母的出现频率。

/*
Enter a string: almost lover 123
a appers 1 time.
e appers 1 time.
l appers 2 times.
m appers 1 time.
o appers 2 times.
r appers 1 time.
s appers 1 time.
t appers 1 time.
v appers 1 time.
 */
import java.util.Scanner;

public class CountLetter {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter a string: ");
        String str = input.nextLine();

        int[] counts = countLetters(str);
        for (int i = 0; i < counts.length; i++) {
            if (counts[i] != 0) {
                System.out.println((char)(i + 'a') + " appers " + counts[i] + ((counts[i] > 1) ? " times." : " time."));
            }
        }
    }

    public static int[] countLetters(String str) {
        final int totalLetters = 26;
        int[] counts = new int[totalLetters];

        for (int i = 0, j; i < str.length(); i++) {
            if (Character.isLetter(str.charAt(i)))
                counts[str.charAt(i) - 'a']++;
        }
        return counts;
    }
}