java - 从jtable中获取对象

Question

我试图从 JTable 中获取一个对象并将其传输到另一个 jform，您可以在其中编辑值。但是当我想在 jform 中显示对象的变量时，我得到一个空指针异常。

private void taBuyersMouseClicked(java.awt.event.MouseEvent evt) {                                      
// TODO add your handling code here:
if (evt.getClickCount() == 2) {
    Model.TabelModel model = (Model.TabelModel) taBuyers.
            getModel();
    int row = taBuyers.getSelectedRow();
    if (row != -1) {
        int Id = (int) model.getValueAt(row, 0);
        String Name = (String) model.getValueAt(row, 1);
        String LastName = (String) model.getValueAt(row, 2);
        Date gebDate = (java.sql.Date) model.getValueAt(row, 3);
        Boolean seller = Boolean.valueOf(model.getValueAt(row, 4).toString());
        String comment = (String) model.getValueAt(row, 5);
        Person pers = new Person(Id,Name,LastName, gebDate,seller,comment);
        MakePerson person = new MakePerson();
        person.setPerson(pers);
        person.setVisible(true);
    } 
}

}

这是我调试时显示的人员，我看到该对象并且所有变量都已填充。

    public void setPerson(Person pers) {
        teId.setText(String.valueOf((pers.getId()))); => here I get the nullpointerexception 
    }


private javax.swing.JTextField teId; 

这是错误:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at gui.scherm.Personscreen.MakePerson.setPerson(MakePerson.java:42)
    at gui.scherm.Personscreen.taBuyersMouseClicked(Personscreeb.java:176)
    at gui.scherm.Personscreen.access$000(Personscreen.java:30)
    at gui.scherm.Personscreen$1.mouseClicked(Personscreen.java:110)

Answer 1

改变这个

private javax.swing.JTextField teId ; 

至

import javax.swing.JTextField;


private JTextField teId = new JTextField();