练习
package com.hanqi; public class 作业 { public static void main(String[] args) { //输出i的次数 String a="mingrikejijavabu"; int b=a.length(); System.out.println("原来字符长度="+b); int c=(a.replace("i","")).length(); System.out.println("现在字符长度="+c); int d=b-c; System.out.println("i一共出现"+d+"次");