扩展AbstractTableModel中的自定义setValueAt方法

因此，我正在研究Java中的DVD租赁系统，并遇到了视图问题。这里是我的代码：扩展AbstractTableModel中的自定义setValueAt方法

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，会员和项目都只是对象我做代表用户（会员）和电影/游戏（项目）班。

public class Member { 
int status; 
String firstName; 
String lastName; 
int ss; 
String email; 
int phoneNumber; 
String address; 
int memberID; 

public Member() 
{ 

} 
public Member(String firstName, String lastName, int ss, String email, int phoneNumber, String address) 
{ 
    this.firstName = firstName; 
    this.lastName = lastName; 
    this.ss = ss; 
    this.email = email; 
    this.phoneNumber = phoneNumber; 
    this.address = address; 
} 

public void setName(String firstName, String lastName) 
{ 
    this.firstName = firstName; 
    this.lastName = lastName; 
} 
public String getName() 
{ 
    return firstName + " " + lastName; 
} 
public void setSS(int ss) 
{ 
    this.ss = ss; 
} 
public int getSS() 
{ 
    return ss; 
} 
public void setEmail(String email) 
{ 
    this.email = email; 
} 
public String getEmail() 
{ 
    return email; 
} 
public void setPhoneNumber(int phoneNumber) 
{ 
    this.phoneNumber = phoneNumber; 
} 
public int getPhoneNumber() 
{ 
    return phoneNumber; 
} 
public void setAddress(String address) 
{ 
    this.address = address; 
} 
public String getAddress() 
{ 
    return address; 
} 
public void setMemberID(int memberID) 
{ 
    this.memberID = memberID; 
} 
public int getMemberID() 
{ 
    return memberID; 
} 
public void setStatus(int status) 
{ 
    this.status = status; 
} 
public int getStatus() 
{ 
    return status; 
} 
}

和

public class Item { 

String title; 
String type; 
int releaseYear; 
int rentalID; 
int price; 
boolean inStock; 

public Item() 
{ 

} 
public Item(String title, String type, int releaseYear, int price) 
{ 
    this.title = title; 
    this.type = type; 
    this.releaseYear = releaseYear; 
    this.price = price; 

} 
public void setTitle(String title) 
{ 
    this.title = title; 
} 
public String getTitle() 
{ 
    return title; 
} 
public void setReleaseYear(int releaseYear) 
{ 
    this.releaseYear = releaseYear; 
} 
public int getReleaseYear() 
{ 
    return releaseYear; 
} 
public void setRentalID(int rentalID) 
{ 
    this.rentalID = rentalID; 
} 
public int getRentalID() 
{ 
    return rentalID; 
} 
public void setPrice(int price) 
{ 
    this.price = price; 
} 
public int getPrice() 
{ 
    return price; 
} 

}

我的问题是，我如何创建一个自定义，覆盖“SetValueAt（）”方法从会员/项目的信息来填充JTable中感到困惑。另一个问题是Listener类中的所有空if语句。我不知道如何去执行。如果任何人都可以就这些问题或其他任何我可能错过的内容提供一些指导，我将不胜感激任何反馈。

来源

2015-04-22 Kyle Weise

* e.getSource（）== “deleteRelease” *，等...将总是为false，首先是因为在这个上下文中的getSource（）将r eturn事件被触发的组件，其次，即使它返回了一个字符串，应该总是使用equals方法比较字符串 – copeg

“if（e.getSource（）==”insertMember“）;” ，首先'=='不应该用来比较两个String值的质量，你应该使用String.equals;第二，尾随的“;”将它们短路，意味着代码立即执行后，不管if语句的评估如何。 – MadProgrammer

“public void setValueAt（Member a，int rowIndex，int colIndex）”should be“public void setValueAt（Object a，int rowIndex，int colIndex）“否则它永远不会被调用 – MadProgrammer

让我们忽略了与代码中所有的“有趣”的问题，并着眼于TableModel

表是数据的二维矩阵，分布在一系列的行和列

的TableModel提供合同由该JTable（视图）可以由TableModel表示的数据交互...

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); 
}

这是很重要的，因为你的数据需要的conf orm到这个合同。

您有一个Member类，它具有一系列定义的属性，每个属性表示一个可能的列值，这使得Member的每个实例成为“行”数据。

您需要决定的第一件事是如何管理所有Member s。由于您已经声明您需要一个“动态”（或可变）模型，所以要使用的更好的数据结构之一可能是ArrayList，因为它可以增长以满足您的需求并具有快速的非顺序访问（您可以从它随机快速点）。

public class MemberTableModel extends AbstractTableModel { 

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

    public MemberTableModel() { 
     members = new ArrayList<>(25); 
    } 

    public MemberTableModel(List<Member> members) { 
     this(); 
     this.members.addAll(members); 
    } 

    public MemberTableModel(Member... members) { 
     this(Arrays.asList(members)); 
    } 

    @Override 
    public int getRowCount() { 
     return members.size(); 
    } 

    @Override 
    public int getColumnCount() { 
     return headers.length; 
    } 

    @Override 
    public String getColumnName(int column) { 
     return headers[column]; 
    }

好了，现在我们需要一些我们得到列特定行...

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; 
    }

设置值是几乎相同的过程...

@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); 
    } 
}

请注意，在此方法中没有验证，您应该检查数值是否符合您对数据的基本要求...

但是，要做出一个表格编辑，你需要重写模型的isCellEdtiable方法...

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

采取从模型中添加或删除成员，则需要在模型中提供的功能，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); 
    } 
}

采取在How to Use Tables定睛一看，Collections Trail更多细节

来源

2015-04-23 00:20:00 MadProgrammer

谢谢@MadProgrammer这个非常有帮助 –

实际上你需要实现比setValueAt（）方法更多的功能。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Creating a Table Model的Swing教程的TableDemo.java代码，了解创建自定义TableModel的基础知识。它会告诉你一种实现各种方法的方法。

但是，TableModel不是一个非常好的通用模型，因为数据基本上是硬编码的，而且您无法添加新的数据行。

为了更好，但更复杂的解决方案，请看Row Table Model。这是一个更通用的TableModel，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。查看博客中找到的JButtonTableModel.java代码以获取所需更改的示例。

来源

2015-04-22 22:05:11 camickr

扩展AbstractTableModel中的自定义setValueAt方法

回答

相关问题