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TA貢獻1858條經(jīng)驗 獲得超8個贊
在從文件加載 Person 之前,您正在保存一個空列表。我建議這種方法:
import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
public class App extends JFrame {
public static JComboBox<Person> peopleBox;
public App() {
try {
loadList();
} catch (IOException | ClassNotFoundException e) {
System.out.println(e.getMessage());
}
try {
saveList(Person.peopleList);
} catch (IOException e) {
System.out.println(e.getMessage());
}
setSize(600, 400);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public void updateData(){
peopleBox = new JComboBox<>();
peopleBox.setModel(getComboBoxModel(Person.peopleList));
add(peopleBox);
pack();
}
public DefaultComboBoxModel<Person> getComboBoxModel(ArrayList<Person> peopleList) {
Person[] comboBoxModel = peopleList.toArray(new Person[0]);
return new DefaultComboBoxModel<>(comboBoxModel);
}
public static void saveList(ArrayList<Person> peopleList) throws IOException {
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("test.bin"));
objectOutputStream.writeObject(peopleList);
}
public static void loadList() throws IOException, ClassNotFoundException {
ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("test.bin"));
Person.peopleList.addAll((List<Person>) objectInputStream.readObject());
}
public static void main(String[] args) {
App app = new App();
Person p = new Person("Sean2", 24);
try {
saveList(Person.peopleList);
} catch (IOException e) {
System.out.println(e.getMessage());
}
app.updateData();
app.setVisible(true);
}
}
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