[{"createTime":1735734952000,"id":1,"img":"hwy_ms_500_252.jpeg","link":"https://activity.huaweicloud.com/cps.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=V1g3MDY4NTY=&utm_medium=cps&utm_campaign=201905","name":"华为云秒杀","status":9,"txt":"华为云38元秒杀","type":1,"updateTime":1735747411000,"userId":3},{"createTime":1736173885000,"id":2,"img":"txy_480_300.png","link":"https://cloud.tencent.com/act/cps/redirect?redirect=1077&cps_key=edb15096bfff75effaaa8c8bb66138bd&from=console","name":"腾讯云秒杀","status":9,"txt":"腾讯云限量秒杀","type":1,"updateTime":1736173885000,"userId":3},{"createTime":1736177492000,"id":3,"img":"aly_251_140.png","link":"https://www.aliyun.com/minisite/goods?userCode=pwp8kmv3","memo":"","name":"阿里云","status":9,"txt":"阿里云2折起","type":1,"updateTime":1736177492000,"userId":3},{"createTime":1735660800000,"id":4,"img":"vultr_560_300.png","link":"https://www.vultr.com/?ref=9603742-8H","name":"Vultr","status":9,"txt":"Vultr送$100","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":5,"img":"jdy_663_320.jpg","link":"https://3.cn/2ay1-e5t","name":"京东云","status":9,"txt":"京东云特惠专区","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":6,"img":"new_ads.png","link":"https://www.iodraw.com/ads","name":"发布广告","status":9,"txt":"发布广告","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":7,"img":"yun_910_50.png","link":"https://activity.huaweicloud.com/discount_area_v5/index.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=aXhpYW95YW5nOA===&utm_medium=cps&utm_campaign=201905","name":"底部","status":9,"txt":"高性能云服务器2折起","type":2,"updateTime":1735660800000,"userId":3}]
具体要求:
(1)使用for循环将字符串从最后一个字符开始遍历。（2）遍历的当前字符如果是大写字符，就使用toLowerCase()方法将其转换为小写字符，反之则使用toUpperCase()方法将其转换为大写字符。（3）定义一个StringBuffer对象，调用append()方法依次添加遍历的字符，最后调用StringBuffer对象的toString(
)方法，并将得到的结果输出。
import java.util.Scanner; public class demo17 { public static void
main(String[] args) { Scanner scan=new Scanner(System.in); String
str=scan.next(); //获取下一个单词，忽视单词前的空白符 char[] ch=str.toCharArray();
//将字符串对象中的字符转换为一个字符数组 StringBuffer sb=new StringBuffer(); for(int
i=str.length()-1;i>=0;i--) { //遍历字符串并将判断其的大小写 if(ch[i]>='A'&&ch[i]<='Z') {
sb.append(String.valueOf(ch[i]).toLowerCase());
//先利用ValueOf（）将字符转化为字符串，后将其插入到StringBuffer中去 //将大写字母转换为小写字母 } else
if(ch[i]>='a'&&ch[i]<='z') { sb.append(String.valueOf(ch[i]).toUpperCase());
//将小写字母转换为大写字母 } } System.out.println(sb.toString()); //toString()可省略 } }
输出结果：
