Java 从键盘输入一个字符串 统计某个字符的个数

从键盘输入一个字符串，统计某个字符的个数

例如，从键盘输入“I am a student”，统计a出现的次数

字符串转字符数组 字符串.toCharArray();

Scanner scanner = new Scanner(System.in);

String str = scanner.nextLine(); 获字符串，回车作为分隔符

import java.util.Scanner;public class TestDemo{public static int getCharCountOfString(String str, char c) {//字符串转字符数组 字符串.toCharArray();char[] arr = str.toCharArray();int count = 0;for (int i = 0; i < arr.length; i++) {if (arr[i] == c){count++;}}return count;}public static void main(String[] args) {Scanner scanner = new Scanner(System.in);String str = scanner.nextLine();int count = getCharCountOfString(str, 'a');System.out.println(count);}}

运行结果：