使用来自另一个类的列表填充JComboBox

Question

我是Java的新手。我创建了一个用户表单，一个骰子对象和一个包含dicetypes的xml文件。我能够解析XML并将类型存储在列表中，但无法弄清楚如何使用dicetype名称填充JCombox。我想我正在寻找一些关于我所缺少的东西的解释。

以下是我的代码：

package dicebag;

import java.awt.EventQueue;

import dicebag.ui.userInterface;
import dicebag.util.parseXML;

/**
 * @author troy.a.pilewski
 */
public class mainApp {

    /**
     * Launch the application.
     * 
     * @param args
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    parseXML parseXML = new parseXML();
                    parseXML.parseXML();
                    parseXML.displayDice();
                    System.out.println(parseXML.getDice());
                    parseXML.getDice();
                    userInterface frame = new userInterface();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

package dicebag.util;

import java.util.Random;

/**
 * @author troy.a.pilewski
 */
public class dice {
    String type;
    int sides;

    /**
     * @param type
     * @param sides
     */
    public dice(String type, int sides) {
        this.type = type;
        this.sides = sides;

    }

    /**
     * Random Generator for rolling one dice
     * 
     * @param sides
     * @return value
     */
    public int roll(int sides) {
        Random randomGen = new Random();
        int value = randomGen.nextInt(sides) + 1;
        return value;

    }

    public String toString() {
        return type;
    }
}

package dicebag.util;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * @author troy.a.pilewski
 */
public class parseXML {
    /**
     * Variable declarations
     */
    public static final String xmlFilePath = "./src/dicebag/util/bag.xml";
    @SuppressWarnings("javadoc")
    public static List<dice> dice = new ArrayList<dice>();

    /**
     * 
     */
    public void parseXML() {
        try {
            File xmlFile = new File(xmlFilePath);
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document xmlDoc = db.parse(xmlFile);

            System.out.println("Root Element: " + xmlDoc.getDocumentElement().getNodeName());
            System.out.println("===============================");

            if (xmlDoc.hasChildNodes()) {
                printNodeList(xmlDoc.getChildNodes());

            }
        } catch (Exception e) {
            System.out.println(e);

        }
    }

    private static void printNodeList(NodeList nodeList) {
        // TODO Auto-generated method stub
        for (int count = 0; count < nodeList.getLength(); count++) {
            Node elemNode = nodeList.item(count);

            if (elemNode.getNodeType() == Node.ELEMENT_NODE) {
                // Get node name and value
                System.out.println("\nNode Name: " + elemNode.getNodeName());
                System.out.println("Node Content: " + elemNode.getTextContent());

                if (elemNode.hasAttributes()) {
                    NamedNodeMap nodeMap = elemNode.getAttributes();
                    Node xmlNode = nodeMap.item(0);

                    System.out.println("Attribute Name: " + xmlNode.getNodeName());
                    System.out.println("Attribute Value: " + xmlNode.getNodeValue());

                    String type = xmlNode.getNodeValue();
                    String temp = elemNode.getTextContent().substring(elemNode.getTextContent().lastIndexOf('e') + 1);
                    int sides = Integer.parseInt(temp.replaceAll("\\n\\t", ""));

                    dice.add(new dice(type, sides));

                }

                if (elemNode.hasChildNodes()) {
                    // Recursive call if there are child nodes
                    printNodeList(elemNode.getChildNodes());

                }
            }
        }
    }

    /**
     * 
     */
    public void displayDice() {
        for (int count = 0; count < dice.size(); count++) {
            if (count < dice.size() - 1) {
                System.out.print(dice.get(count) + ", ");
            } else {
                System.out.println(dice.get(count));
            }
        }
    }

    /**
     * @param dice
     * @return dice
     */
    public List<dice> getDice() {
        return dice;
    }
}

package dicebag.ui;

import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

import dicebag.util.dice;
import net.miginfocom.swing.MigLayout;

/**
 * @author troy.a.pilewski
 */
@SuppressWarnings("serial")
public class userInterface extends JFrame {

    private static final String dice = null;
    private JPanel contentPane;
    private JTextField txtDiceQty;
    private JTextField txtRollMod;
    private JTextField txtRollTotal;
    private JTable tblRolls;

    /**
     * Create the frame.
     */
    public userInterface() {
        setTitle("Dicebag");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 450);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new MigLayout("", "[:75px:75px][:75px:75px][:75px:75px][:175px:175px]",
                "[][][][][][][][][][][][][][][]"));

        JLabel lblRollTotal = new JLabel("Roll Total: ");
        contentPane.add(lblRollTotal, "cell 2 0,alignx leading,growy");

        txtRollTotal = new JTextField();
        txtRollTotal.setEditable(false);
        contentPane.add(txtRollTotal, "cell 3 0,growx");
        txtRollTotal.setColumns(10);

        JLabel lblDiceQty = new JLabel("Dice Qty: ");
        contentPane.add(lblDiceQty, "cell 0 1,alignx leading,growy");

        txtDiceQty = new JTextField();
        contentPane.add(txtDiceQty, "cell 1 1,growx");
        txtDiceQty.setColumns(10);

        tblRolls = new JTable();
        tblRolls.setRowSelectionAllowed(false);
        contentPane.add(tblRolls, "cell 2 1 2 14,grow");

        JLabel lblDiceType = new JLabel("Dice Type: ");
        contentPane.add(lblDiceType, "cell 0 2,alignx leading,growy");

        JComboBox cboDiceType = new JComboBox();
        List<dice> dice = new ArrayList<dice>();
        for (dice d : dice) {
            cboDiceType.addItem(d);
        }
        contentPane.add(cboDiceType, "cell 1 2,growx");

        JLabel lblRollModifier = new JLabel("Roll Modifier: ");
        contentPane.add(lblRollModifier, "cell 0 3,alignx leading,growy");

        txtRollMod = new JTextField();
        contentPane.add(txtRollMod, "cell 1 3,growx");
        txtRollMod.setColumns(10);

        JButton btnRoll = new JButton("Roll Dice");
        contentPane.add(btnRoll, "cell 0 4 2 1,grow");
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<bag>
    <dice name="D3"><sides>3</sides>
    </dice>
    <dice name="D4"><sides>4</sides>
    </dice>
    <dice name="D6"><sides>6</sides>
    </dice>
    <dice name="D8"><sides>8</sides>
    </dice>
    <dice name="D10"><sides>10</sides>
    </dice>
    <dice name="D12"><sides>12</sides>
    </dice>
    <dice name="D20"><sides>20</sides>
    </dice>
    <dice name="D%"><sides>100</sides>
    </dice>
</bag>

有人可以给我一点指示吗？另外，我正在使用Eclipse IDE。