输入任意一个字符串，如：“abDEe23dJfd343dPOddfe4CdD5ccv!23rr”。取出该字符串中所有的字母。顺序不能改变！并把大写字母变成小写，小写字母变成大写！

Posted 2020-07-21

   package lovo.Linyoujia;

   import java.util.Scanner;

   public class Java {

   

@param args
 

 public static void main(String[] args) {
 

 TODO Auto-generated method stub
   

String bs = "asdfjvjadsffvaadfkfasaffdsasdffadsafafsafdadsfaafd";
 

 int count = 0;
 

 char[] charArray = bs.toCharArray();
 

 for (int i = 0; i < bs.length() - 1; i++) {
  

 if (charArray[i] == ‘a‘ && charArray[i + 1] == ‘f‘) {
  

  count++;
  

 }
 

 }
 

 System.out.println(count);