Question

我遇到了一个问题，我的代码将登录表单链接到我的csr表单，以将员工重定向到正确的表单。我有一个Staff类和一个CustomerServiceRep类，CustomerServiceRep扩展到Staff。代码是

        //staff object to store staff logged in successfully
         Staff emp = null; 

         /*Use core to store staff logged in should return an staff
         object if username/password found OR null if credentials invalid*/

         emp = core.login(username, password);

         if (emp==null){//staff not found

              //display feedback 
         pop.showMessageDialog(
             null,
             "Login Credentials Invalid",
             "Errors",
             JOptionPane.ERROR_MESSAGE
         );
         }else{//staff found, redirect to dashboard

             pop.showMessageDialog(
             null,
             "Login Successful",
             "Feedback",
             JOptionPane.INFORMATION_MESSAGE
         );
             //redirect user to appropriate dashboard
             if(emp.getRole().equals("csr")){
                 //go to csr dash

                 //hide the login form(current form)
                 this.setVisible(false);

                /**create new instance of AdminDashboard form and
                 * pass the instance of Staff (emp) who
                 * has logged in successfully
                 */ 
                 Z_Frm_CSR CSRDash = new Z_Frm_CSR(emp);

                 //Show CSR Dashboard
                 CSRDash.setVisible(true);

             }

我收到错误“不兼容的类型：员工无法转换为CustomerServiceRep”为emp

                 Z_Frm_CSR CSRDash = new Z_Frm_CSR(emp);

我是这个网站的新手，对编码很新，我不知道如果我提供了足够的错误信息，请询问更多信息，如果没有给出。

Answer 1

您需要进行显式转换，因为您的Z_Frm_CSR构造函数可能在其声明（CustomerServiceRep）中使用显式类型而不是基类（Staff）或通用类型（T扩展Staff）。

所以：exists

不兼容的类型：员工无法转换为CustomerServiceRep

1 个答案: