字符串修改（以短信内容为例）

package Lx;
import java.util.Random;
public class DuanXin {
  public static void main(String[] args) {
      String note = "【神盾局联盟】您好，您的入局申请验证码为：{1}，请在{2}分钟内验证完毕";
        Random random = new Random();
        //验证码
        String code = String.valueOf(random.nextInt(9));
        for (int i = 0; i < 5; i++) {
            code += random.nextInt(9);
        }
        //过期时间
        String ExpireTime = "3";
        StringBuilder sb = new StringBuilder(note);
        sb.replace(27,30,ExpireTime).replace(21,24,code);
        note = String.valueOf(sb);
        System.out.println(note);
  }
}