java:18:错误：找不到符号

接收错误

import java.security.Security;  

 import java.util.Properties;  


 import javax.mail.Message;  

 import javax.mail.NoSuchProviderException;  

 import javax.mail.Session;  
 import javax.mail.Transport;  

 import javax.mail.PasswordAuthentication;  

 import javax.mail.internet.AddressException;  

 import javax.mail.internet.InternetAddress;  

 import javax.mail.internet.MimeMessage;  



 public class SendMail {  



 public String to;  

 public String subject;  

 public String text;  



 SendMail(String to, String subject, String text){  

      this.to = to;  
      this.subject = subject;  

      this.text = text;  

     }  



public void send() throws NoSuchProviderException, AddressException{  



  try 

        {  

           Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());  

           Properties props=new Properties();  

           props.setProperty("mail.transport.protocol","smtp");  

           props.setProperty("mail.host","mail.epro-tech.com");  

           props.put("mail.smtp.auth","true");  

           props.put("mail.smtp.port","465");  

           props.put("mail.debug","true");  

           props.put("mail.smtp.socketFactory.port","465");  

           props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");  

           props.put("mail.smtp.socketFactory.fallback","false");  

           Session session=Session.getDefaultInstance(props,new GJMailAuthenticator());  

           session.setDebug(true);  
           Transport transport=session.getTransport();  

           InternetAddress addressFrom=new InternetAddress("itopstest@epro-tech.com");  

           MimeMessage message=new MimeMessage(session);  

           message.setSender(addressFrom);  

           message.setSubject(subject);  

           message.setContent(text,"text/html");  

           InternetAddress addressTo=new InternetAddress(to);  

           message.setRecipient(Message.RecipientType.TO,addressTo);  

           transport.connect();  

           Transport.send(message);  

           transport.close();  
           System.out.println("DONE");  



         }  

         catch(Exception e)  

         {  



           e.printStackTrace();  

         }  

    }  

 }  

class GJMailAuthenticator extends javax.mail.Authenticator{  

     protected PasswordAuthentication getPasswordAuthentication()  

     {  

         return new PasswordAuthentication("itopstest@epro-tech.com","Ops@890T");  



     }  

 } 



 public class Mail extends SendMail {  



     public static void main(String[] args) {  



         String to = "noreply@eprocorp.com";  

         String subject = "Test";  

         String message = "A test message";  



         SendMail SendMail = new SendMail(to, subject, message);  

                 try 

                 {  

                     SendMail.send();  

                }  

                 catch (Exception e)  

                 {  

                     //  

                 }  

     }  

 } 

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有谁能建议我如何纠正这个问题吗？我知道有问题

邮件类正在扩展没有默认cunstructor的SendMail类。所以，要么在SendMail类中创建一个默认cunstructor，要么在Mail类中创建一个参数化cunstructor

SendMail.send；在这里，我猜编译器正在尝试访问SendMail类的静态方法。创建像SendMail SendMail=newsendmailto、subject、message这样的对象；并访问sendMail.send等发送方法

为这两个类指定适当的包名，因为类具有可以在JAR中找到的通用名称

---

代码已包含构造函数

SendMailString收件人、字符串主题、字符串文本 { 这个； this.subject=主语； this.text=文本； }

---

缺少SendMail对象。应在Mail中导入SendMail类包Class@user2053430SendMail类包是否已导入？？？

Mail.java:18: error: cannot find symbol
         SendMail SendMail = new SendMail(to, subject, message);
         ^
  symbol:   class SendMail
  location: class Mail
Mail.java:18: error: cannot find symbol
         SendMail SendMail = new SendMail(to, subject, message);
                                 ^
  symbol:   class SendMail
  location: class Mail
2 errors

 even at extends in the class Mail i can see the errors