将数据从arraylist插入到JTable的单元格中

Question

我正在开发一个登录房间应用程序，登录用户可以选择访问者（最多3位）与他们一起进入房间。处理访问者的类返回一个ArrayList，我希望从中将数据输入到JTable的单元格中，该单元格显示签入房间的用户。我的问题是我不确定如何在JTable的特定单元格中将列表中的每个记录显示为单独的一行。

这是主类（称为SignBoardTest）：

import java.awt.*;
import java.awt.event.*;
import java.util.Random;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class SignBoardTest {
	public static void main(String[] args) 	{
		new SignBoardTest();		
	}

	private JFrame inOutFrame;
	
	private JPanel topPanel;
	private JPanel headerPanel;
	private JPanel mainPanel;
	private JPanel btnPanel;
	
	private JLabel roomLabel;

	private JButton addUserBtn;
	
	private JTable testTbl;

	private String[] answer = {"Eligible", "Not Eligible"};
	private String[] first = {"Jack", "Kelly", "Mike", "Lisa"};
	private String[] last = {"Donovan", "Marshall", "Jones", "Kinder"};
	
	private Visitor visitor;
	
	public SignBoardTest()
	{
		//place GUI components on JFrame's content pane
		inOutFrame = new JFrame("ISF Out of Office Board");
				
		topPanel = new JPanel();
		topPanel.setLayout(new BorderLayout());
		headerPanel = new JPanel();
		btnPanel = new JPanel();
		mainPanel = new JPanel(new BorderLayout());
		
		roomLabel = new JLabel("CLOSED AREA ROOM");
		roomLabel.setFont(new Font("Segoe UI", Font.BOLD, 30));
				
		addUserBtn = new JButton("Add user");

		String [] colNames = {"First Name",	"Last Name",
				"Can be area monitor?",	"Visitor(s)",
				"Status", ""};
		
		DefaultTableModel model = new DefaultTableModel(colNames, 0);
		
		testTbl = new JTable(model);
		testTbl.setFillsViewportHeight(true);

		MultilineTableCellRenderer renderer = new MultilineTableCellRenderer();
		testTbl.setDefaultRenderer(String.class, renderer);
		testTbl.setRowHeight(testTbl.getRowHeight() * 3);
		

		JScrollPane pane = new JScrollPane(testTbl);
		mainPanel.add(pane, BorderLayout.CENTER);
		
		//action for add user feature
		addUserBtn.addActionListener(new ActionListener()
		{
			@Override
			public void actionPerformed(ActionEvent e)
			{
				
				String fName = first[new Random().nextInt(first.length)];
				String lName = last[new Random().nextInt(last.length)];
				String areaMonitor = answer[new Random().nextInt(answer.length)];
				
				model.addRow(new Object[] {fName, lName, areaMonitor, visitor, 
						"Logout", "Add/Remove Visitors"});
				
				BtnColumn visitorBtnColumn = new BtnColumn(testTbl, visitorMgmt, 5);
				visitorBtnColumn.setMnemonic(KeyEvent.VK_E);
				
				BtnColumn logoutBtnColumn = new BtnColumn(testTbl, logout, 4);
				logoutBtnColumn.setMnemonic(KeyEvent.VK_D);
			}
			
		});
		
		btnPanel.add(addUserBtn);
		
		headerPanel.add(roomLabel);
		
		topPanel.add(headerPanel, BorderLayout.PAGE_START);
		topPanel.add(btnPanel, BorderLayout.PAGE_END);
		
		topPanel.setBorder(new EtchedBorder(EtchedBorder.RAISED));
		mainPanel.setBorder(new EtchedBorder(EtchedBorder.RAISED));

		inOutFrame.add(topPanel, BorderLayout.PAGE_START);
		inOutFrame.add(mainPanel, BorderLayout.CENTER);
		
		inOutFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		inOutFrame.pack();
		inOutFrame.setSize(1200, 1000); //default size in case screen is not full
		inOutFrame.setLocationRelativeTo(null);
		inOutFrame.setVisible(true);
		inOutFrame.setResizable(false);
		
}
	//handling of adding/removing users
	//with ButtonColumn class
	@SuppressWarnings("serial")
	Action visitorMgmt = new AbstractAction()
	{
		public void actionPerformed(ActionEvent e)
		{
			int row = testTbl.getSelectedRow();
			
			visitor = new Visitor();
			
			//make window modal
			visitor.setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
			visitor.setLocationRelativeTo(null);
			visitor.setVisible(true);
			
			if(visitor.getChoice() == JOptionPane.YES_OPTION)
			{
				for(String name : visitor.getVisitorList())
				{
					System.out.println("Adding user: " + name);
					
					String value = testTbl.getValueAt(row, 3) + name + " \n";
					testTbl.setValueAt(value, row, 3);
				}
			}
		}
	};
	
	//handle of logging out users using ButtonColumn class
	@SuppressWarnings("serial")
	Action logout = new AbstractAction()
	{
		public void actionPerformed(ActionEvent e)
		{
			int row = testTbl.getSelectedRow();
			String first = testTbl.getModel().getValueAt(row, 0).toString();
			String last = testTbl.getModel().getValueAt(row, 1).toString();
			String name = first.concat(" ").concat(last);
			
			if(doesUserHaveVisitors(row))
				JOptionPane.showMessageDialog(null, 
						"Visitors must be logged out or transferred to \nanother employee before signing out",
						"ERROR: ILLEGAL ACTION", JOptionPane.ERROR_MESSAGE);
			else
			{	
				int response = JOptionPane.showConfirmDialog(null, 
					"Are you sure you want to log out " + name + "?",
					"Logout confirmation", 
					JOptionPane.OK_CANCEL_OPTION,
					JOptionPane.QUESTION_MESSAGE);
				
				if(response == JOptionPane.YES_OPTION)
				{
					JTable table = (JTable)e.getSource();
					int modelRow = Integer.valueOf(e.getActionCommand());
					((DefaultTableModel)table.getModel()).removeRow(modelRow);
				}
			}
		}
	};
	
	private boolean doesUserHaveVisitors(int selectedRow)
	{
		Object value = testTbl.getValueAt(selectedRow, testTbl.getColumn("Visitor(s)").getModelIndex());
		
		if(value != null)
			return true;
		else
			return false;
	}
	
} //end class SignInBoard

/**
 * The MultiLineTableCellRenderer class is a customized to allow for multi-line
 * entry into a column of a JTable. This will allow for users to enter multiple
 * visitors (max 3) against their login record.
 *
 */
@SuppressWarnings("serial")
class MultilineTableCellRenderer extends JList<String> implements TableCellRenderer
{
	@Override
	public Component getTableCellRendererComponent(JTable table, Object value,
			boolean isSelected, boolean hasFocus, int row, int column)
	{
		//make multi-line where the cell value is String[]
		if (value instanceof String[]) {
			setListData((String[]) value);
		}
		
		return this;
	}
}

用于用户管理访问者的Visitor类：

import java.awt.Container;
import java.util.ArrayList;

import java.awt.event.*;
import javax.swing.*;

@SuppressWarnings("serial")
public class Visitor extends JDialog implements ActionListener {
	
	private JButton newVisitorButton;
	private JButton doneButton;
	
	private JPanel contentPanel; //"body" of JDialog
	
	private JOptionPane visitorInputPane;
	
	private ArrayList<String> visitorList; //list to store visitors
	private int visitorCtr = 0; //counter for 
	
	public Visitor()	{
		setTitle("Visitor Management");
		
		newVisitorButton = new JButton("New Visitor Entry");
		doneButton = new JButton("Done");
		
		contentPanel = new JPanel();
		contentPanel.setLayout(new BoxLayout(contentPanel, BoxLayout.Y_AXIS));
		newVisitorButton.setAlignmentX(CENTER_ALIGNMENT);
		contentPanel.add(newVisitorButton);
		
		//since users can only have 3 visitors max,
		//list will be initialized to this size
		visitorList = new ArrayList<String>(3); 
		
		JButton[] buttonChoices = {doneButton};

		visitorInputPane = new JOptionPane(contentPanel,
				JOptionPane.PLAIN_MESSAGE,
				JOptionPane.YES_NO_OPTION,
				null,
				buttonChoices,
				buttonChoices[0]);
		
		setContentPane(visitorInputPane);
		
		//handle the window closing - force
		//the user to use one of the buttons
		//to avoid closing w/out any action
		setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
		addWindowListener(new WindowAdapter()		{
			public void windowClosing(WindowEvent we)
			{
				JOptionPane.showMessageDialog(visitorInputPane,
						"Please close this using the Cancel button");
			}
		});
		
		pack();
		
		//listeners for button pushes
		
		doneButton.addActionListener(new ActionListener()	{
			@Override
			public void actionPerformed(ActionEvent e)	{
				dispose();
			}
		});
		
		newVisitorButton.addActionListener(new ActionListener()	{
			@Override
			public void actionPerformed(ActionEvent e)
			{

				if(visitorCtr > 2)
					JOptionPane.showMessageDialog(visitorInputPane, "Cannot add more visitors (max 3)!",
							"MAX LIMIT REACHED", JOptionPane.ERROR_MESSAGE);
				else
				{
					contentPanel.add(new VisitorEntryPanel());
					pack();
					visitorCtr++;
				}

			}
		});
	
	}

	@Override
	public void actionPerformed(ActionEvent e)	{
	}
	
	//return visitor list
	public ArrayList<String> getVisitorList() {
		return visitorList;
	}
	
	//return choice from JDialog
	public int getChoice()	{
		return visitorInputPane.getOptionType();
	}

	//custom JPanel inner class for adding
	//new user to list
	private class VisitorEntryPanel extends JPanel
	{
		private JLabel nameLabel;
		private JTextField nameField;
		private JButton removeVisitorButton;
		private JButton addVisitorButton;
		
		VisitorEntryPanel()
		{
			nameLabel = new JLabel("Name: ");
			nameField = new JTextField(20);
			removeVisitorButton = new JButton("Remove");
			addVisitorButton = new JButton("Add");
			
			add(nameLabel);
			add(nameField);
			add(addVisitorButton);
			add(removeVisitorButton);
			
			removeVisitorButton.addActionListener(new ActionListener()
			{
				@Override
				public void actionPerformed(ActionEvent event)
				{
					visitorList.remove(getVisitorName());
					
					Container myParent = removeVisitorButton.getParent();
					Container parent = myParent.getParent();
					parent.remove(myParent);
					parent.repaint();
					parent.revalidate();
					
					visitorCtr--;
					System.out.println("New visitor count: " + visitorCtr);
				}
			});
			
			addVisitorButton.addActionListener(new ActionListener()
			{
				@Override
				public void actionPerformed(ActionEvent ev)
				{
					if(getVisitorName().length() != 0)
					{
						visitorList.add(getVisitorName());
						
						//disable button after good entry
						addVisitorButton.setEnabled(false);
					}
					else //can't submit null/empty name
						JOptionPane.showMessageDialog(visitorInputPane, "Visitor name cannot be empty!",
								"EMPTY NAME ENTERED", JOptionPane.ERROR_MESSAGE);				}
			});
		}
		
		public String getVisitorName() {
			return(nameField.getText().trim());
		}
		
	} //end class visitorPanel
	
} //end class Visitor

按钮列类来自以下link（我认为没有必要在此处重新发布）。我在此post中使用了Channa提供的答案来创建自定义TableCellRenderer，以从我的ArrayList获取数据，但是我无法正确执行它。任何帮助，将不胜感激。谢谢。