//定義代表發送的消息類
public class Message
{
    //定義收件人字段
    private String to;
    //定義郵件主題字段
    private String subject;
    //定義郵件內容字段
    private String content;
    //默認構造函數
    public Message()
    {

    }
     //帶參數的構造函數
    public Message(String to, String subject, String content)
    {
        this.to = to;
        this.subject = subject;
        this.content = content;
    }

    //屬性字段的get和set方法
    public String getContent()
    {
        return content;
    }

    public void setContent(String content)
    {
        this.content = content;
    }
    public String getSubject()
    {
        return subject;
    }

    public void setSubject(String subject)
    {
        this.subject = subject;
    }

    public String getTo()
    {
        return to;
    }
    public void setTo(String to)
    {
        this.to = to;
    }
    
    public String toString()
    {
        return to+subject+content; 
    }
}