如何使用休眠将数据库中的值获取到 jlist？

Question

我在这里获得了教室名称，但我无法使用 Jlist 获取教室 ID。 我怎样才能得到教室ID？我想在 jlist 中显示教室名称，但同时，我想获取它的教室 ID。请帮助解决这个问题。

    Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    session.beginTransaction();
    Query query2 = session.createQuery("FROM Senior.entity.Classroom CL ");
    List<Classroom> results2 = query2.list();
    ////////List_2 için if /////////////////////
    if (results2.size() > 0) {
        Iterator iterate = results2.iterator();
        final Classroom resultAccoun2t = (Classroom) iterate.next();
        list_2.removeAll();
        for (Classroom inv : results2) {

            my problem is here, i didnt take classrroomId like this;

            //list2.add(new ListItem(inv.getClassromId(),inv.getClassroomName()));
            defaultListModel2.addElement(inv.getClassroomName());
        }
    }
    ////////My class//


    class ListItem{
private int classroom_id;
private String classroomname;

public ListItem(int classroom_id, String classroom_name) {
    this.classroom_id = classroom_id;
    this.classroomname = classroom_name;
}

public int getClassroom_id() {
    return classroom_id;
}

public void setClassroom_id(int classroom_id) {
    this.classroom_id = classroom_id;
}

public String getClassroomname() {
    return classroomname;
}

public void setClassroomname(String classroom_name) {
    this.classroomname = classroomname;
}

@Override
public String toString() {
    return  classroomname ;
}

}

Answer 1

不需要多余的ListItem。只需覆盖 ClassRoom 中的 toString() 并将 ClassRoom 对象添加到列表中即可。

class ClassRoom {

    private String name;
    private int id;

    @Override
    public String toString() {
        return "Id: " + id + " , Name: " + name;
    }
}
...
for (ClassRoom cls : classes) {
    model.addElement(cls);
}

---

例子

import java.util.ArrayList;
import java.util.List;
import javax.swing.*;

public class TestClassroomList {

    public TestClassroomList() {
        List<ClassRoom> classes = createList();
        DefaultListModel model = createModel(classes);
        JList list = new JList(model);

        JFrame frame = new JFrame();
        frame.add(new JScrollPane(list));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private List<ClassRoom> createList() {
        List<ClassRoom> classes = new ArrayList<>();
        classes.add(new ClassRoom(1, "Biology"));
        classes.add(new ClassRoom(2, "History"));
        classes.add(new ClassRoom(3, "Calculus"));
        classes.add(new ClassRoom(4, "Programming"));
        classes.add(new ClassRoom(5, "Data Structures"));
        classes.add(new ClassRoom(6, "Sociology"));
        return classes;
    }

    private DefaultListModel createModel(List<ClassRoom> classes) {
        DefaultListModel model = new DefaultListModel();
        for (ClassRoom cls : classes) {
            model.addElement(cls);
        }
        return model;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TestClassroomList();
            }
        });
    }

    class ClassRoom {

        private String name;
        private int id;

        public ClassRoom(int id, String name) {
            this.id = id;
            this.name = name;
        }

        @Override
        public String toString() {
            return "Id: " + id + " , Name: " + name;
        }
    }
}