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我是使用swing和使用Jcombo框的新手,我试图创建一个列车线路,站点的下拉列表,我收到错误,我有一种感觉,我可能是将数据导入数组列表错误,但程序吐出火车线阵列,到控制台,但我已经注释掉了println命令,因为我现在正在使用GUI。Java Combobox与Arraylist错误
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.util.ArrayList cannot be cast to javax.swing.ComboBoxModel
at TouchOn.setPanels(TouchOn.java:63)
at TouchOn.<init>(TouchOn.java:52)
at GUI$2.actionPerformed(GUI.java:51)
我从下面的代码中收到上述错误。
import javax.swing.*;
import java.awt.Dialog.ModalityType;
import java.awt.event.*;
import java.awt.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
public class TouchOn extends JDialog {
private JPanel mainPanel;
public ArrayList Reader() {
try {
ArrayList<String> Trains = new ArrayList<String>();
int count = 0;
String testing = "";
File file = new File("Trainlines.txt");
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
StringBuffer stringBuffer = new StringBuffer();
String line;
while ((line = bufferedReader.readLine()) != null)
{
stringBuffer.append(line);
count += count;
Trains.add(line + "\n");
stringBuffer.append("\n");
}
fileReader.close();
//Arrays.asList(Trains).stream().forEach(s -> System.out.println(s));
return Trains;
} catch (IOException e) {
e.printStackTrace();
}
//return toString();
return null;
}
public TouchOn()
{
setPanels();
setModalityType(ModalityType.APPLICATION_MODAL);
setSize(200, 200);
setVisible(true);
}
public void setPanels()
{
mainPanel = new JPanel(new GridLayout(0, 2));
JPanel containerPanel = new JPanel(new GridLayout(0, 1));
ArrayList stations = Reader();
JComboBox<ArrayList> cb = new JComboBox<ArrayList>((ComboBoxModel<ArrayList>) stations);
JPanel lowerPanel = new JPanel(new FlowLayout());
JButton apply = new JButton("Touch on ?");
JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
dispose();
}
});
apply.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.out.println("HellO");
}
});
JLabel touchOnDate = new JLabel("Date: ");
JLabel touchOnTimehr = new JLabel("Time Hour: ");
JLabel touchOnTimem = new JLabel("Time Minute:");
JLabel station = new JLabel("Station: ");
JTextField touchOnFieldDate = new JTextField();
JTextField touchOnTimeFieldhour = new JTextField();
JTextField touchOnTimeFieldminute = new JTextField();
//JTextField touchOnStation = new JTextField();
cb.setVisible(true);
mainPanel.add(touchOnDate);
mainPanel.add(touchOnFieldDate);
mainPanel.add(touchOnTimehr);
mainPanel.add(touchOnTimeFieldhour);
mainPanel.add(touchOnTimem);
mainPanel.add(touchOnTimeFieldminute);
mainPanel.add(station);
mainPanel.add(cb);
//mainPanel.add(touchOnStation);
lowerPanel.add(apply);
lowerPanel.add(cancel);
touchOnTimeFieldhour.setSize(10,10);
containerPanel.add(mainPanel);
containerPanel.add(lowerPanel);
add(containerPanel);
}
}
善良我是新的,任何文章或教程阅读将不胜感激,学习Java是相当困难的。
我当时正在玩转转换,并且它们返回未定义的错误。所以这种方式似乎是唯一的方式,似乎没有产生任何错误 –
哇谢谢你.....如果你不介意可以请你解释for循环,它与我使用的非常不同,我只是困惑关于如何抓取和输入值,组合框。 –
这就是所谓的“增强for循环”,看看[this](https://blogs.oracle.com/CoreJavaTechTips/entry/using_enhanced_for_loops_with)和[this](https://docs.oracle.com /javase/tutorial/java/nutsandbolts/for.html)以获取更多详细信息 – MadProgrammer