java语言程序设计第十版（Introduce to java） 课后习题 chapter6-23

package chapter6;public class Test23 {public static void main(String[] args) {String a = "asdfsl;kjfdoljsadmlfkjasdklfh";System.out.println(count(a,'d'));System.out.println(count(a,'m'));}public static int count(String str, char a){int counter=0;for(int i=0;i<str.length();i++){if(str.charAt(i)==a){counter++;}}return counter;}}