java - 给java类赋值，但不返回值

Question

所以我有一个学生类。

我有一个 Jlist 并尝试添加一个学生对象。我设置了dob值。

一切正常，没有问题。当我检索 sout“student”时，它返回所有其他值，但不返回 Dob。当我调用 Student.getDob() 实际上它会返回，意味着它已被分配。

不知道为什么它不将学生作为对象检索。我想也许 netbeans 中有一个错误。

有什么帮助吗？

private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {                                          

    // Create an instance of student
    Student student = new Student();
    student.setFName(firstNameField.getText());
    student.setLName(lastNameField.getText());
    student.setDob(dateOfBirthField.getText());
    student.setGender((String) genderComboBox.getSelectedItem());
    System.out.println(student.getDob());

    // Add student to the list
    ListModel lModel = jList1.getModel();
    DefaultListModel dlm = new DefaultListModel<Object>();
    int total = lModel.getSize();
    for (int x = 0; x < total; x++) {
        dlm.addElement(lModel.getElementAt(x));
    }
    dlm.addElement(student);
    jList1.setModel(dlm);
    //Clearing the text fields for the next entry
    firstNameField.setText("");
    lastNameField.setText("");
    dateOfBirthField.setText("");
    genderComboBox.setSelectedIndex(0);}
}      

学生类(class):

import java.util.ArrayList; 
import java.util.Date;

public class Student {

     private String id;


    private String fName;


    private String lName;

    private String gender;

    private String dob;

    private ArrayList<Address> addresses;

    private Instructor instructor;


    private ArrayList<Courses> courses;


    public Student () {
    }


    public ArrayList<Address> getAddresses () {
        return addresses;
    }


    public void setAddresses (ArrayList<Address> val) {
        this.addresses = val;
    }


    public ArrayList<Courses> getCourses () {
        return courses;
    }


    public void setCourses (ArrayList<Courses> val) {
        this.courses = val;
    }


    public String getDob () {
        return dob;
    }


    public void setDob (String val) {
        this.dob = val;
    }


    public String getFName () {
        return fName;
    }

    public void setFName (String val) {
        this.fName = val;
    }


    public String getGender () {
        return gender;
    }


    public void setGender (String val) {
        this.gender = val;
    }


    public String getId () {
        return id;
    }


    public void setId (String val) {
        this.id = val;
    }


    public Instructor getInstructor () {
        return instructor;
    }

    public void setInstructor (Instructor val) {
        this.instructor = val;
    }

    public String getLName () {
        return lName;
    }


    public void setLName (String val) {
        this.lName = val;
    }
    @Override
    public String toString(){
    return getFName()+" "+getLName()+" "+getGender();
    } 
}

Answer 1

我通过深度调试发现了它。在学生类，多布没有被拉弦。最后添加了 getDob() 。

@Override
    public String toString(){
    return getFName()+" "+getLName()+" "+getGender()+" "+getDob(); 
    }