我无法通过assetListing（）方法在我的JFrame上显示我的JList。出于某种原因，它甚至不会出现在我的MainFrame JFrame上。编译器似乎看到了它，因为我在运行时遇到了ClassCastException错误。如果有人能帮我解决这个问题，它会给我带来很多麻烦，现在已经有一段时间了......
package wealthmanager;
import InheritanceDesign.Asset;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
;
public class WealthManagerForm extends JFrame implements ActionListener
{
private JFrame MainFrame = new JFrame("Wealth Manager");
private JFrame assetEntry1 = new JFrame("Bank Account");
private JFrame assetEntry2 = new JFrame("Stocks");
private JFrame assetEntry3 = new JFrame("Car");
private JFrame assetEntry4 = new JFrame("House");
private JMenuBar assetMenu = new JMenuBar();
private JMenu selectAsset = new JMenu("New");
private JMenuItem bank = new JMenuItem("Bank Account");
private JMenuItem stock = new JMenuItem("Stocks");
private JMenuItem car = new JMenuItem("Car");
private JMenuItem house = new JMenuItem("House");
private JList assetListDisplay;
private JPanel assetData;
private JScrollPane assetScroll;
private Vector assetList = new Vector();
public WealthManagerForm()
{
gui();
}
public void gui()
{
MainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MainFrame.setSize(1200, 800);
MainFrame.setVisible(true);
JLabel heading = new JLabel("Assets");
assetEntry1.setSize(450, 200);
assetEntry2.setSize(450, 250);
assetEntry3.setSize(450, 275);
assetEntry4.setSize(450, 270);
assetMenu.add(selectAsset);
selectAsset.setFont(new Font("SansSerif", Font.PLAIN, 17));
MainFrame.setJMenuBar(assetMenu);
newMenu();
assetListing();
}
public void assetListing()
{
JPanel listPanel = new JPanel(new BorderLayout());
listPanel.setPreferredSize(new Dimension(400, 150));
MainFrame.setLayout(new BorderLayout());
MainFrame.add(listPanel);
setLayout(new GridLayout());
assetListDisplay = new JList (assetList);
//assetListDisplay.addListSelectionListener((ListSelectionListener) this);
listPanel.add(assetListDisplay);
listPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder()));
pack();
}
public void valueChanged(ListSelectionEvent event)
{
if(event.getSource() == assetListDisplay && !event.getValueIsAdjusting())
{
String stringValue = (String)assetListDisplay.getSelectedValue();
//if(stringValue != null)
//
// assetData.setText(stringValue);
}
}
public void newMenu()
{
bankMenu();
stockMenu();
carMenu();
houseMenu();
MainFrame.setJMenuBar(assetMenu);
}
@Override
public void actionPerformed(ActionEvent ae) {
}
public void bankMenu()
{
selectAsset.add(bank);
bank.setFont(new Font("SansSerif", Font.PLAIN, 20));
selectAsset.addSeparator();
bank.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent ae) {
assetEntry1.setVisible(true);
}
});
JPanel panel2 = new JPanel();
panel2.setPreferredSize(new Dimension(400, 120));
assetEntry1.setLayout(new GridBagLayout());
assetEntry1.add(panel2);
setLayout(new GridLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.WEST;
constraints.insets = new Insets(100, 100, 100, 100);
constraints.gridx = 0;
constraints.gridy = 0;
JLabel bankLabel1 = new JLabel("Name ");
JLabel bankLabel2 = new JLabel("Balance");
JTextArea bankText1 = new JTextArea(2, 30);
JTextArea bankText2 = new JTextArea(2, 30);
JButton bankButton1 = new JButton("Cancel");
JButton bankButton2 = new JButton("Save");
panel2.add(bankLabel1, constraints);
constraints.gridx = 1;
panel2.add(bankText1, constraints);
constraints.gridx = 0;
constraints.gridy = 1;
panel2.add(bankLabel2, constraints);
constraints.gridx = 1;
panel2.add(bankText2, constraints);
constraints.anchor = GridBagConstraints.CENTER;
panel2.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder()));
pack();
setLocationRelativeTo(null);
panel2.add(bankButton1, "South");
panel2.add(bankButton2, "South");
}
public void stockMenu()
{
selectAsset.add(stock);
stock.setFont(new Font("SansSerif", Font.PLAIN, 20));
selectAsset.addSeparator();
stock.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
assetEntry2.setVisible(true);
//setVisible(true);
}
});
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(400, 150));
assetEntry2.setLayout(new GridBagLayout());
assetEntry2.add(panel);
setLayout(new GridLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.WEST;
constraints.insets = new Insets(100, 100, 100, 100);
constraints.gridx = 0;
constraints.gridy = 0;
JLabel stockLabel1 = new JLabel("Ticker ");
JLabel stockLabel2 = new JLabel("Quantity");
JLabel stockLabel3 = new JLabel("Price ");
JTextArea stockText1 = new JTextArea(2, 30);
JTextArea stockText2 = new JTextArea(2, 30);
JTextArea stockText3 = new JTextArea(2, 30);
JButton stockButton1 = new JButton("Cancel");
JButton stockButton2 = new JButton("Save");
panel.add(stockLabel1, constraints);
constraints.gridx = 1;
panel.add(stockText1, constraints);
constraints.gridx = 0;
constraints.gridy = 1;
panel.add(stockLabel2, constraints);
constraints.gridx = 1;
panel.add(stockText2, constraints);
constraints.gridx = 0;
constraints.gridy = 2;
panel.add(stockLabel3, constraints);
constraints.gridx = 1;
panel.add(stockText3, constraints);
constraints.anchor = GridBagConstraints.CENTER;
panel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder()));
pack();
setLocationRelativeTo(null);
panel.add(stockButton1, "South");
panel.add(stockButton2, "South");
}
public void carMenu()
{
selectAsset.add(car);
car.setFont(new Font("SansSerif", Font.PLAIN, 20));
car.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
assetEntry3.setVisible(true);
}
});
JPanel panel3 = new JPanel();
panel3.setPreferredSize(new Dimension(400, 200));
assetEntry3.setLayout(new GridBagLayout());
assetEntry3.add(panel3);
setLayout(new GridLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.WEST;
constraints.insets = new Insets(100, 100, 100, 100);
constraints.gridx = 0;
constraints.gridy = 0;
JLabel carLabel1 = new JLabel("Type ");
JLabel carLabel2 = new JLabel("Name");
JLabel carLabel3 = new JLabel("Value");
JLabel carLabel4 = new JLabel("Debt ");
JTextArea carText1 = new JTextArea(2, 30);
JTextArea carText2 = new JTextArea(2, 30);
JTextArea carText3 = new JTextArea(2, 30);
JTextArea carText4 = new JTextArea(2, 30);
JButton carButton1 = new JButton("Cancel");
JButton carButton2 = new JButton("Save");
panel3.add(carLabel1, constraints);
constraints.gridx = 1;
panel3.add(carText1, constraints);
constraints.gridx = 0;
constraints.gridy = 1;
panel3.add(carLabel2, constraints);
constraints.gridx = 1;
panel3.add(carText2, constraints);
constraints.gridx = 0;
constraints.gridy = 2;
panel3.add(carLabel3, constraints);
constraints.gridx = 1;
panel3.add(carText3, constraints);
constraints.gridx = 0;
constraints.gridy = 3;
panel3.add(carLabel4, constraints);
constraints.gridx = 1;
panel3.add(carText4, constraints);
constraints.anchor = GridBagConstraints.CENTER;
panel3.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder()));
pack();
setLocationRelativeTo(null);
panel3.add(carButton1, "South");
panel3.add(carButton2, "South");
}
public void houseMenu()
{
selectAsset.add(house);
house.setFont(new Font("SansSerif", Font.PLAIN, 20));
selectAsset.addSeparator();
house.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
assetEntry4.setVisible(true);
}
});
JPanel panel4 = new JPanel();
panel4.setPreferredSize(new Dimension(400, 200));
assetEntry4.setLayout(new GridBagLayout());
assetEntry4.add(panel4);
setLayout(new GridLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.WEST;
constraints.insets = new Insets(100, 100, 100, 100);
constraints.gridx = 0;
constraints.gridy = 0;
JLabel houseLabel1 = new JLabel("Type ");
JLabel houseLabel2 = new JLabel("Name");
JLabel houseLabel3 = new JLabel("Value");
JLabel houseLabel4 = new JLabel("Debt ");
JTextArea houseText1 = new JTextArea(2, 30);
JTextArea houseText2 = new JTextArea(2, 30);
JTextArea houseText3 = new JTextArea(2, 30);
JTextArea houseText4 = new JTextArea(2, 30);
JButton houseButton1 = new JButton("Cancel");
JButton houseButton2 = new JButton("Save");
panel4.add(houseLabel1, constraints);
constraints.gridx = 1;
panel4.add(houseText1, constraints);
constraints.gridx = 0;
constraints.gridy = 1;
panel4.add(houseLabel2, constraints);
constraints.gridx = 1;
panel4.add(houseText2, constraints);
constraints.gridx = 0;
constraints.gridy = 2;
panel4.add(houseLabel3, constraints);
constraints.gridx = 1;
panel4.add(houseText3, constraints);
constraints.gridx = 0;
constraints.gridy = 3;
panel4.add(houseLabel4, constraints);
constraints.gridx = 1;
panel4.add(houseText4, constraints);
constraints.anchor = GridBagConstraints.CENTER;
panel4.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder()));
pack();
setLocationRelativeTo(null);
panel4.add(houseButton1, "South");
panel4.add(houseButton2, "South");
}
}