Question

链接到超类的变量时：名字姓街道地址邮编 ******中国

代码工作正常，但如果我添加一个子类的三个额外变量部门名称 TFN AnnualSalary

找不到变量，bluej但是，VISUALLY连接到子类。

我只是摆脱了额外的变量，但是如果我做的话我的代码没有编译，那么现在，变量就在那里，但没有被完全使用。

代码：

数组列表

private ArrayList<Person> myShopEmployee = new ArrayList<Person>();
    private JFrame frame;

    private JLabel labFirstName;   
    private JTextField txtFirstName;

    private JLabel labLastName;   
    private JTextField txtLastName;

    private JLabel labStreetAddress;   
    private JTextField txtStreetAddress;

    private JLabel labPostCode;   
    private JTextField txtPostCode;

    private JLabel labPhoneNumb;   
    private JTextField txtPhoneNumb;

    private JLabel labDepartmentName;   
    private JTextField txtDepartmentName;

    private JLabel labTFN;   
    private JTextField txtTFN;

    private JLabel labAnnualSalary;   
    private JTextField txtAnnualSalary;

    private int index = 0;

如果我从这行代码中删除了额外的变量，而上面的数组我的代码没有编译。

class creatingShopEmployeeListener implements ActionListener 
        {
            public void actionPerformed(ActionEvent event)
            {
                JOptionPane.showMessageDialog(frame,
                                            "example", JOptionPane.ERROR_MESSAGE);

                                          ShopEmployee newShopEmployee = new ShopEmployee (txtFirstName.getText(),txtLastName.getText(),txtStreetAddress.getText(),txtPostCode.getText(),txtPhoneNumb.getText(),txtDepartmentName.getText(),txtTFN.getText(),txtAnnualSalary.getText());
                                          myShopEmployee.add(newShopEmployee);
                JOptionPane.showMessageDialog(frame,
                                            "ShopEmployee has been created" );


            }
        }

如果以上两个代码示例保持不变，则发生无法找到符号错误的位置。（这里我有TFN，但错误发生在三个变量中的任何一个。）

 class seeShopEmployeeListener implements ActionListener 
        {
            public void actionPerformed(ActionEvent event)
            {
                     if (myShopEmployee.size() > 0) 
                     {

                         ShopEmployee curShopEmployee = (ShopEmployee) myShopEmployee.get(index);
                         txtFirstName.setText(curShopEmployee.getFirstName());
                         txtLastName.setText(curShopEmployee.getLastName() );
                         txtStreetAddress.setText(curShopEmployee.getStreetAddress() );
                         txtPostCode.setText(curShopEmployee.getPostCode() );
                         txtPhoneNumb.setText(curShopEmployee.getPhoneNumb() );
                         txtTFN.setText(curShopEmployee.getTFN() );
                     if ( index < myShopEmployee.size() -1 ) { index ++; }
                     else {
                            JOptionPane.showMessageDialog(frame,
                                "No ShopEmployee" );
                            } 
                }
            }
        }

最后这是ShopEmployee类

public class ShopEmployee extends Person
{
    //creating variables
    private String departmentName;
    private String TFN, annualSalary;
    public ShopEmployee()//ShopEmployee constructor
    {

        //setting values for the new variables
        departmentName = "";
        TFN = "";
        annualSalary = "";

    }
    public ShopEmployee(String myFirstName, String myLastName, String myStreetAddress, String myPostCode, String myPhoneNumb, String myDepartmentName, String myTFN, String myAnnualSalary)//ShopEmployee constructor which contains these variables
    {

        super(myFirstName,myLastName,myStreetAddress,myPostCode,myPhoneNumb);
        departmentName = myDepartmentName;
        TFN = myTFN;
        annualSalary = myAnnualSalary;

    }
    //setting up the variables
     public void setDepartmentName(String myDepartmentName)
    {
        setDepartmentName(myDepartmentName);
    }
    public void setTFN(String myTFN)
    {
        setTFN(myTFN);
    }
    public void setAnnualSalary(String myAnnualSalary)
    {
        setAnnualSalary(myAnnualSalary);
    }
    public String toString()
    {
        return super.toString() + ", TFN is " + TFN + ", Annual Salary is " + annualSalary + ", and Department Name is " + departmentName;//returns the super variable string which includes the name phone number ect then adds on the new variables
    }
}

谢谢。任何帮助表示赞赏。

Answer 1

您尚未为新字段TFN＆amp;添加getter。部门名称。由于这两个变量被声明为私有，因此也无法直接访问它们。你试图打电话给吸气剂

curShopEmployee.getTFN（）

但您的班级中不存在该方法。

找不到符号，无法弄清楚为什么会出现此错误

1 个答案: