Java 扩展AbstractTableModel中的自定义setValueAt方法

所以我正在用Java开发DVD租赁系统，遇到了视图问题。 这是我的密码：

import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import java.awt.*;
import java.awt.event.*;
public class RentalSystem extends JFrame {

JMenuBar menuBar;
JMenuItem insertMember;
JMenuItem deleteMember;
JMenuItem editMember;
JMenuItem retrieveMember;
JMenuItem insertRelease;
JMenuItem deleteRelease;
JMenuItem editRelease;
JMenuItem retrieveRelease;
JMenu menu;
JMenu menu2;
JComboBox searchMember;
JComboBox searchRelease;
JButton adminButton;
JButton userButton;
JButton existingUser;
JButton newUser;
JTable memberTable; 
JTable releaseTable; 
int existingUserCheck = 1; //0 = existing user, 1 = new user
int adminCheck = 1; //0 = admin, 1 = customer


public RentalSystem()
{
    super("Tape/DVD/Game Rental System");
    setBounds(0,0,1000,500);
    //while(adminCheck == 0)
    {
        display2();
        while(existingUserCheck == 0) {

        }
    }

}
private class MenuActionListener implements ActionListener {

      public void actionPerformed(ActionEvent e) {

        if(e.getSource() == "insertMember");
        {
            String name = JOptionPane.showInputDialog("Enter Last Name:");
            String name2 = JOptionPane.showInputDialog("Enter First Name:");
            String ss = JOptionPane.showInputDialog("Enter Social Security Number:");
            int a = Integer.parseInt(ss);
            String email = JOptionPane.showInputDialog("Enter Email Address:");
            String phoneNumber = JOptionPane.showInputDialog("Enter Phone Number:");
            int b = Integer.parseInt(phoneNumber);
            String address = JOptionPane.showInputDialog("Enter Address:");

            Member member = new Member(name, name2, a, email, b, address);
            //add member to table

        }
        if(e.getSource() == "deleteMember");
        {

        }
        if(e.getSource() == "editMember");
        {

        }
        if(e.getSource() == "retrieveMember");
        {

        }
        if(e.getSource() == "insertRelease");
        {
            String title = JOptionPane.showInputDialog(this  ,"Enter Title:");
            String type = JOptionPane.showInputDialog(this  ,"Enter Type(Tape/DVD/Game):");
            String releaseYear = JOptionPane.showInputDialog(this  ,"Enter Year of Release:");
            int a = Integer.parseInt(releaseYear);
            String price = JOptionPane.showInputDialog(this  ,"Enter Price:");
            int b = Integer.parseInt(price);


            Item item = new Item(title, type, a, b);
            //add item to table

        }
        if(e.getSource() == "deleteRelease");
        {

        }
        if(e.getSource() == "editRelease");
        {

        }
        if(e.getSource() == "retrieveRelease");
        {

        }
      }
    }

private class ComboBoxActionListener implements ActionListener {


    public void actionPerformed(ActionEvent e) {

        String s = (String) searchMember.getSelectedItem();
        String f = (String) searchRelease.getSelectedItem();


            if(s.equals("Last Name")){

            }
            else if(s.equals("First Name")){
            }
            else if(s.equals("Phone Number")){
            }
            else if(s.equals("Member ID")){
            }

            if(f.equals("Title")){

            }
            else if(f.equals("Category")){
            }
            else if(f.equals("Type")){
            }
            else if(f.equals("Rental ID")){

            }


            if(e.getSource() == "Existing User")
            {

            }


    }

}

private class ButtonListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {

        if(e.getSource() == adminButton)
        {
            menuBar = new JMenuBar();
            menu = new JMenu("Members");
            menuBar.add(menu);
            menu2 = new JMenu("Releases");
            menuBar.add(menu2);

            insertMember = new JMenuItem("Insert New Member");
            deleteMember = new JMenuItem("Delete Member");
            editMember = new JMenuItem("Edit Member");
            retrieveMember = new JMenuItem("Retrieve Member");
            menu.add(insertMember);
            menu.add(deleteMember);
            menu.add(editMember);
            menu.add(retrieveMember);
            insertRelease = new JMenuItem("Insert New Release");
            deleteRelease = new JMenuItem("Delete Release");
            editRelease = new JMenuItem("Edit Release");
            retrieveRelease = new JMenuItem("Retrieve Release");
            menu2.add(insertRelease);
            menu2.add(deleteRelease);
            menu2.add(editRelease);
            menu2.add(retrieveRelease);

            JScrollPane c  = new JScrollPane();
            JScrollPane b = new JScrollPane();


            TableModel memberModel = new MemberTableModel();
            TableModel itemModel = new ItemTableModel();
            memberTable = new JTable(memberModel);
            releaseTable = new JTable(itemModel);

            c.add(memberTable);
            c.add(releaseTable);

            String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
            String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
            searchMember = new JComboBox(searchMemberChoices);
            searchRelease = new JComboBox(searchReleaseChoices);


            //add(c, BorderLayout.CENTER);
            //add(b, BorderLayout.SOUTH);
            add(searchMember, BorderLayout.WEST);
            add(searchRelease, BorderLayout.EAST);
            add(menuBar, BorderLayout.NORTH);

            setVisible(true);
            setResizable(true);
            setDefaultCloseOperation(EXIT_ON_CLOSE);

            insertMember.addActionListener(new MenuActionListener());
            deleteMember.addActionListener(new MenuActionListener());
            editMember.addActionListener(new MenuActionListener());
            retrieveMember.addActionListener(new MenuActionListener());
            insertRelease.addActionListener(new MenuActionListener());
            deleteRelease.addActionListener(new MenuActionListener());
            editRelease.addActionListener(new MenuActionListener());
            retrieveRelease.addActionListener(new MenuActionListener());
            searchMember.addActionListener(new ComboBoxActionListener());
            searchRelease.addActionListener(new ComboBoxActionListener());
        }
        if(e.getSource() == userButton)
        {
            adminCheck = 1;

            menuBar = new JMenuBar();
            menu = new JMenu("Members");
            menuBar.add(menu);
            menu2 = new JMenu("Releases");
            menuBar.add(menu2);


            retrieveMember = new JMenuItem("Retrieve Member");
            menu.add(retrieveMember);
            retrieveRelease = new JMenuItem("Retrieve Release");
            menu2.add(retrieveRelease);

            JScrollPane c  = new JScrollPane();
            JScrollPane b = new JScrollPane();


            TableModel memberModel = new MemberTableModel();
            TableModel itemModel = new ItemTableModel();
            memberTable = new JTable(memberModel);
            releaseTable = new JTable(itemModel);



            c.add(memberTable);
            c.add(releaseTable);


            String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
            String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
            searchMember = new JComboBox(searchMemberChoices);
            searchRelease = new JComboBox(searchReleaseChoices);


            //add(c, BorderLayout.CENTER);
            //add(b, BorderLayout.SOUTH);
            add(searchMember, BorderLayout.WEST);
            add(searchRelease, BorderLayout.EAST);
            add(menuBar, BorderLayout.NORTH);


            setVisible(true);
            setResizable(true);
            setDefaultCloseOperation(EXIT_ON_CLOSE);


            insertMember.addActionListener(new MenuActionListener());
            deleteMember.addActionListener(new MenuActionListener());
            editMember.addActionListener(new MenuActionListener());
            retrieveMember.addActionListener(new MenuActionListener());
            insertRelease.addActionListener(new MenuActionListener());
            deleteRelease.addActionListener(new MenuActionListener());
            editRelease.addActionListener(new MenuActionListener());
            retrieveRelease.addActionListener(new MenuActionListener());
            searchMember.addActionListener(new ComboBoxActionListener());
            searchRelease.addActionListener(new ComboBoxActionListener());

        }



        if(e.getSource() == existingUser);
        {

        }
         if(e.getSource() == newUser)
            {
                existingUserCheck = 1;
                JTextField field1 = new JTextField("");
                JTextField field2 = new JTextField("");
                JTextField field3 = new JTextField("");
                JTextField field4 = new JTextField("");
                JTextField field5 = new JTextField("");
                JTextField field6 = new JTextField("");

                JPanel panel = new JPanel(new GridLayout(0, 1));
                panel.add(new JLabel("Last Name:"));
                panel.add(field1);
                panel.add(new JLabel("First Name:"));
                panel.add(field2);
                panel.add(new JLabel("Social Security #:"));
                panel.add(field3);
                panel.add(new JLabel("Email:"));
                panel.add(field4);
                panel.add(new JLabel("Phone Number:"));
                panel.add(field5);
                panel.add(new JLabel("Address"));
                panel.add(field6);
                add(panel);
                int result = JOptionPane.showConfirmDialog(null, panel, "Registration",
                    JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
                if (result == JOptionPane.OK_OPTION) {

                    int ss = Integer.parseInt(field3.getText());
                    int phoneNumber = Integer.parseInt(field5.getText());

                      //memberTable.addMember(field1.getText(),field2.getText(), ss, field4.getText(), phoneNumber, field6.getText());

                }
            }
    }
}
class MemberTableModel extends AbstractTableModel {

    private String[]  headers = {"Last Name", "First Name", "SS#", "Email", "Phone Number", "Address"};


    @Override
    public int getColumnCount() {

        return headers.length;
    }

    @Override
    public int getRowCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getValueAt(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return null;
    }
    public void setValueAt(Member a, int rowIndex, int colIndex)
    {

    }

}
class ItemTableModel extends AbstractTableModel {

    @Override
    public int getColumnCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getRowCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getValueAt(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return null;
    }
    public void setValueAt()
    {

    }

}
public void display()//displays first screen:admin/user log-in
{
     userButton = new JButton("User");
     adminButton = new JButton("Admin");

    JPanel panel = new JPanel(new GridLayout(0, 1));
    panel.add(userButton);
    panel.add(adminButton);
    add(panel);

    userButton.addActionListener(new ButtonListener());
    adminButton.addActionListener(new ButtonListener());


    setVisible(true);
    setResizable(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

}

public void display2()//displays second screen:user log-in / register
{
     existingUser = new JButton("Existing User");
     newUser = new JButton("New User");

    JPanel panel = new JPanel(new GridLayout(0, 1));
    panel.add(newUser);
    panel.add(existingUser);
    add(panel);

    existingUser.addActionListener(new ButtonListener());
    newUser.addActionListener(new ButtonListener());


    setVisible(true);
    setResizable(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

}
public void display3() //displays user screen/functionality
{

}
public static void main(String[] args) {

    JFrame frame = new RentalSystem();

}
}

现在，Member和Item只是我用来表示用户（成员）和电影/游戏（项目）的对象类

及

我的问题是，我对如何创建一个自定义的、被重写的“SetValueAt（）”方法以使用来自成员/项的信息填充JTables感到困惑。

---

另一个问题是侦听器类中的所有空if语句。我不知道该如何实施它们。如果有人能就这些问题中的任何一个提供一些指导，或者我可能错过的任何其他问题，我将非常感谢任何反馈

实际上，您需要实现的远不止setValueAt（）方法。您需要决定如何存储所有数据。您需要实现getValueAt（…）方法，以便数据可以显示在表中

查看Swing教程中的

TableDemo.java

代码，了解创建自定义TableModel的基础知识。它将向您展示实现各种方法的一种方法

但是，TableModel不是一个很好的通用模型，因为数据基本上是硬编码的，并且您没有能力添加新行数据

要获得更好但更复杂的解决方案，请查看。这是一个更通用的表格模型，具有更大的灵活性。但是，您仍然需要为要添加到表中的自定义对象实现几个方法。查看博客中的

JButtonTableModel.java

代码，了解所需更改的示例。

让我们忽略代码中所有“有趣”的问题，关注

TableModel

表是数据的二维矩阵，分布在一系列行和列上

TableModel

提供了一个契约，通过该契约，

JTable

（视图）可以与

TableModel

表示的数据进行交互

public interface TableModel
{
    public int getRowCount();
    public int getColumnCount();
    public String getColumnName(int columnIndex);
    public Class<?> getColumnClass(int columnIndex);
    public boolean isCellEditable(int rowIndex, int columnIndex);
    public Object getValueAt(int rowIndex, int columnIndex);
    public void setValueAt(Object aValue, int rowIndex, int columnIndex);
    public void addTableModelListener(TableModelListener l);
    public void removeTableModelListener(TableModelListener l);
}

好的，现在我们需要一些数据来获取特定行的列

    protected Member getMemberAt(int row) {
        return members.get(row);
    }

    @Override
    public Object getValueAt(int row, int col) {
        Object value = null;
        Member member = getMemberAt(row);
        switch (col) {
            case 0:
                // Need getter for last name
                break;
            case 1:
                // Need getter for first name
                break;
            case 2:
                value = member.getSS();
                break;
            case 3:
                value = member.getEmail();
            case 4:
                value = member.getPhoneNumber();
            case 5:
                value = member.getAddress();
        }
        return value;
    }

设置值的过程基本相同

    @Override
    public void setValueAt(Object value, int rowIndex, int colIndex) {
        Member member = getMemberAt(rowIndex);
        switch (colIndex) {
            case 0:
                member.setName(value.toString(), member.getLastName());
                break;
            case 1:
                member.setName(member.getFirstName(), value.toString());
                break;
            case 2:
                if (value instanceof Integer) {
                    member.setSS((Integer) value);
                }
                break;
            case 3:
                member.setEmail(value.toString());
                break;
            case 4:
                if (value instanceof Integer) {
                    member.setPhoneNumber((Integer)value);
                }
                break;
            case 5:
                member.setAddress(value.toString());
                break;
        }
        fireTableRowsUpdated(rowIndex, colIndex);
    }
}

注意，此方法中没有验证，您应该检查这些值是否满足您对数据的基本要求

但是，要使表格可编辑，您需要覆盖模型的

iscelldtable

方法

@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
    return true;
}

如果从模型中添加或删除成员，则需要在模型中提供功能，例如

public void add(Member member) {
    int size = members.size();
    members.add(member);
    fireTableRowsInserted(size, size);
}

public void remove(Member member) {
    int index = members.indexOf(member);
    if (index > -1) {
        members.remove(member);
        fireTableRowsDeleted(index, index);
    }
}

---

请仔细查看并获取更多详细信息

e.getSource（）=“deleteRelease”等。。。将始终计算为false，首先是因为此上下文中的getSource（）将返回触发事件的组件，其次，即使它确实返回字符串，也应始终使用equals方法比较字符串“if（e.getSource（）==”insertMember“；”有两个问题，首先，不应使用“==”来比较两个字符串值的质量，应使用String.equals；第二，尾随“；”使它们短路，这意味着无论对if语句的求值如何，代码都会在执行后立即执行……“public void setValueAt（成员a，int rowIndex，int colIndex）”应该是“public void setValueAt（对象a，int rowIndex，int colIndex）”，否则永远不会是called@MadProgrammer啊对，if语句后面的分号只是一个输入错误。就“setValueAt”而言，我试图获得它，以便：a.lastName将位于第1列的“Last Name”标题下a.firstName将位于第2列的“First Name”标题下，依此类推，因为所有相关的datasetValueAt都希望设置列值，该列值由该行的对象表示。您需要做的第一件事是检索指定行的成员，然后设置表示提供的列的属性Thank you@MadProgrammer这非常有帮助

    @Override
    public void setValueAt(Object value, int rowIndex, int colIndex) {
        Member member = getMemberAt(rowIndex);
        switch (colIndex) {
            case 0:
                member.setName(value.toString(), member.getLastName());
                break;
            case 1:
                member.setName(member.getFirstName(), value.toString());
                break;
            case 2:
                if (value instanceof Integer) {
                    member.setSS((Integer) value);
                }
                break;
            case 3:
                member.setEmail(value.toString());
                break;
            case 4:
                if (value instanceof Integer) {
                    member.setPhoneNumber((Integer)value);
                }
                break;
            case 5:
                member.setAddress(value.toString());
                break;
        }
        fireTableRowsUpdated(rowIndex, colIndex);
    }
}

@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
    return true;
}

public void add(Member member) {
    int size = members.size();
    members.add(member);
    fireTableRowsInserted(size, size);
}

public void remove(Member member) {
    int index = members.indexOf(member);
    if (index > -1) {
        members.remove(member);
        fireTableRowsDeleted(index, index);
    }
}