Question

我已经声明了一个ArrayList和DefaultListModel

DefaultListModel model;

List<AddFlight> Flights = new ArrayList<AddFlight>();

在此列表中，我添加了一个对象作为元素

Flights.add(new AddFlight(txtFlightNo.getText(),
            (String)cmbMechanicalStatus.getSelectedItem(),
            (String)cmbMedicalStatus.getSelectedItem(),
            Float.valueOf((txtFuelLevel.getText()).trim()).floatValue(),
            (String)cmbWeatherCondition.getSelectedItem(),
            (String)cmbFrequency.getSelectedItem()));

在已执行的操作（ActionEvent e）中，我想在JScrollPane上以可理解的方式在一行中打印每个对象。

model.add(0,Flights);

我的输出如下[当我将 2个对象添加到ArrayList时]：

alt text http://i27.tinypic.com/apgojc.jpg

我想要什么：

1）我希望ArrayList中的每个对象都出现在一行中。

2）我希望它在JScrollPane中显示如下：

航班号：UL209，机械状态：正常，医疗状态：故障，燃油油位：12.0 //第一行

航班号：UL210，机械状态：正常，医疗状态：正常，燃油油位：22.0 //第二行

但是，我设法使用以下代码打印出每个元素：

   for (AddFlight Flight : Flights) {
        System.out.println("FLight No : " + Flight.getFlightNo());
        System.out.println("Mechanical Status : " + Flight.getMechanicalStatus());
        System.out.println("Medical Status : " + Flight.getMedicalStatus());
        System.out.println("Fuel Level : " + Flight.getFuelLevel());
        System.out.println("Weather Condition: " + Flight.getWeatherCondition());
        System.out.println("Frequency : " + Flight.getFrequency());

    }

我的完整代码

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Flight implements ActionListener {

//String array
String[] MechanicalStatus = {"Select", "Ok", "Failure"};
String[] MedicalStatus = {"Select", "Ok", "Failure"};
String[] WeatherCondition = {"Select", "Sunny", "Raining", "Thunder", "Hurricane"};
String[] Frequency = {"Will be AutoSet", "ATC 1", "ATC 2", "ATC 3"};
//JPanel
JPanel pnlInput = new JPanel(new GridLayout(7, 2, 20, 20));
//Add textfields here
JTextField txtFlightNo = new JTextField(8);
JComboBox cmbMechanicalStatus = new JComboBox(MechanicalStatus);
JComboBox cmbMedicalStatus = new JComboBox(MedicalStatus);
JTextField txtFuelLevel = new JTextField(8);
JComboBox cmbWeatherCondition = new JComboBox(WeatherCondition);
JComboBox cmbFrequency = new JComboBox(Frequency);
//Add labels here
JLabel lblFlightNo = new JLabel("Flight No : ");
JLabel lblMechanicalStatus = new JLabel("Mechanical Status : ");
JLabel lblMedicalStatus = new JLabel("Medical Status : ");
JLabel lblFuelLevel = new JLabel("Fuel Level (gallons) : ");
JLabel lblWeatherCondition = new JLabel("Weather Condition :");
JLabel lblFrequency = new JLabel("Frequency : ");
List<AddFlight> Flights = new ArrayList<AddFlight>();
DefaultListModel model;

public Flight(DefaultListModel model) {

    this.model = model;

    //Adding flightno to panel
    pnlInput.add(lblFlightNo);
    pnlInput.add(txtFlightNo);

    //Adding mechanicalstatus to the panel
    pnlInput.add(lblMechanicalStatus);
    pnlInput.add(cmbMechanicalStatus);

    //Adding medicalstatus to the panel
    pnlInput.add(lblMedicalStatus);
    pnlInput.add(cmbMedicalStatus);

    //Adding fuellevel to the panel
    pnlInput.add(lblFuelLevel);
    pnlInput.add(txtFuelLevel);

    //Adding weathercondition to the panel
    pnlInput.add(lblWeatherCondition);
    pnlInput.add(cmbWeatherCondition);

    //Adding frequency to the panel
    pnlInput.add(lblFrequency);
    pnlInput.add(cmbFrequency);
}

public void actionPerformed(ActionEvent e) {
    int result = JOptionPane.showConfirmDialog(null, pnlInput, "Flight Details",
            JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);

    if (result == JOptionPane.OK_OPTION) {
        System.out.println("Plane [" + txtFlightNo.getText() + "] has arrived at the airport.\n");
        System.out.println("Mechanical status " + cmbMechanicalStatus.getSelectedItem() + "\n");
    }



    Flights.add(new AddFlight(txtFlightNo.getText(),
            (String) cmbMechanicalStatus.getSelectedItem(),
            (String) cmbMedicalStatus.getSelectedItem(),
            Float.valueOf((txtFuelLevel.getText()).trim()).floatValue(),
            (String) cmbWeatherCondition.getSelectedItem(),
            (String) cmbFrequency.getSelectedItem()));

    //persons.add(new AddFlight("UL210", "FAILURE", "OK", 90, "Rainy", "ATC 2"));


    for (AddFlight Flight : Flights) {
        System.out.println("FLight No : " + Flight.getFlightNo());
        System.out.println("Mechanical Status : " + Flight.getMechanicalStatus());
        System.out.println("Medical Status : " + Flight.getMedicalStatus());
        System.out.println("Fuel Level : " + Flight.getFuelLevel());
        System.out.println("Weather Condition: " + Flight.getWeatherCondition());
        System.out.println("Frequency : " + Flight.getFrequency());

    }

    model.add(0, Flights);
}
}

感谢任何帮助......

Answer 1

您在控件中显示两次列表。此外，如果要显示相关信息而不仅仅是对象类型和内存地址，则需要定义toString方法：

public String toString()
{
    return "Flight No: " + flightNo + ", Mechanical Status:" + mechStatus + ", Medical Status : " + medStatus + ",Fuel Level : " + fuel;
}

编辑：

看起来，为了在一行上显示每个AddFlight对象，你应该使用

model.add(0, Flights.get(Flights.size() - 1));

（将每个AddFlight对象单独添加到模型中）

而不是

model.add(0,Flights);

（每次添加新元素时，将整个ArrayList添加到模型中）

如何在java中将对象的属性添加到JScrollPane

1 个答案: