Question

我有一个从arraylist更新的JTable。在GUI中，我有ADD，DELETE，MODIFY按钮。当我选择一行时，我想让我能够按下MODIFY按钮并在提示输入新值时我已经覆盖了setValueAt和isCellEditable方法，但没有任何反应，值保持不变。以下是可编译的测试示例。我能做的最短的。
提前谢谢！

import java.util.ArrayList;
import java.util.List;
import javax.swing.JOptionPane;
import javax.swing.table.AbstractTableModel;

public class GUI extends javax.swing.JFrame {
Test model = new Test();

    public GUI() {
        initComponents();
          jTable.setModel(model);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable = new javax.swing.JTable();
        modify = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        tfName = new javax.swing.JTextField();
        tfPhone = new javax.swing.JTextField();
        add = new javax.swing.JButton();
        delete = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(jTable);

        modify.setText("Modify");
        modify.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                modifyActionPerformed(evt);
            }
        });

        jLabel1.setText("Name");

        jLabel2.setText("Phone");

        add.setText("Add");
        add.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addActionPerformed(evt);
            }
        });

        delete.setText("Delete");
        delete.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                deleteActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(add)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 73, Short.MAX_VALUE)
                        .addComponent(delete)
                        .addGap(50, 50, 50)
                        .addComponent(modify)
                        .addGap(77, 77, 77))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(tfPhone))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(tfName, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 192, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(tfName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(tfPhone, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 26, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(modify)
                    .addComponent(add)
                    .addComponent(delete))
                .addContainerGap())
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    private void modifyActionPerformed(java.awt.event.ActionEvent evt) {                                       
         // TODO add your handling code here:
        String nrtel = JOptionPane.showInputDialog("Edit phone number");
        model.setValueAt(nrtel, jTable.getSelectedRow(), 3);
    }                                      

    private void addActionPerformed(java.awt.event.ActionEvent evt) {                                    
        String nume = tfName.getText();
        String nrtel = tfPhone.getText();
        model.adaugareContact(nume, nrtel);
    }                                   

    private void deleteActionPerformed(java.awt.event.ActionEvent evt) {                                       
         int selRow = jTable.getSelectedRow();
        if (selRow != -1) {
            model.stergeContact(selRow);
        }
    }                                      

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new GUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton add;
    private javax.swing.JButton delete;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable;
    private javax.swing.JButton modify;
    private javax.swing.JTextField tfName;
    private javax.swing.JTextField tfPhone;
    // End of variables declaration                   
}

class Test extends AbstractTableModel{

public static final int NAME = 0;
public static final int PHONE = 1;

     public static List<Contact> listaContacte = new ArrayList<Contact>();

      private final String[] columns = {
        "Name",
        "Phone"
    };

     @Override
    public int getRowCount() {
        if (listaContacte.size() <= 0) 
      {
         return 0;
      } else {
          return listaContacte.size();
      }
    }

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

    @Override
    public String getColumnName(int col) {
        return columns[col];
    }

    @Override
    public Object getValueAt(int row, int col) {
        if (col == 0) {
            return listaContacte.get(row).getName();
        } else if (col == 1) {
            return listaContacte.get(row).getNrTel();
        }
        return "Eroare";
    }

    @Override
   public void setValueAt(Object aValue, int rowIndex, int colIndex) {

      Contact abonat = listaContacte.get(rowIndex);
      switch (colIndex) {
      case 0:
         abonat.setName((String)aValue);
         break;
      case 1:
         abonat.setNrTel((NrTel)aValue);
         break;
      }
      fireTableRowsUpdated(rowIndex, rowIndex);

   }

//     @Override     
//            //olso tried this but "Object cannot be converted to string"
//   public void setValueAt(Object value, int row, int column) {
//     
//      Contact abonat = listaContacte.get(row);
//      switch (column) {
//        case NAME:
//            abonat.name = value;
//            break;
//        case PHONE:
//            abonat.phone = value;
//            break;
//
//    }
//    updateTable(row, column);
//
//   }
//   
//   public void updateTable(int row, int column) {
//    fireTableCellUpdated(row, column);
//}

     @Override
        public boolean isCellEditable(int row, int colNum) {
            switch (colNum) {
                case 2:
                    return false;
                default:
                    return true;
            }
        }

         public void adaugareContact(String nume, String tel) {

        Long s = Long.valueOf(tel);
        listaContacte.add(new Contact(nume, new NrTel(s)));

        fireTableDataChanged();

    }

          public void stergeContact(int row){

        listaContacte.remove(row);
        fireTableDataChanged();
    }

}

   class Contact {

        public String Name;
    public NrTel phone;

    public Contact(String n, NrTel nr ) {

        Name = n;
                phone = nr;    
    }

    public String getName() {
        return Name;
    }

       public NrTel getNrTel(){
                return phone;
       }

       public void setNrTel(NrTel nrtel) {
        this.phone = nrtel;
    }

              public void setName(String name) {
        this.Name = name;
    }

   }

   class NrTel {

    private long nrtel;

    public NrTel( long nr){

        nrtel = nr;
    }  
        public long getNrTel(){
                return nrtel;
       }
        @Override
    public String toString() {

                String str = ""+nrtel;
                nrtel = Long.valueOf(str);
               return str;
    }
}

编辑：

我修改了这个方法

如果a为0，则修改第一列。如果我有1我得到一些错误

private void modifyActionPerformed(java.awt.event.ActionEvent evt) {                                       
    String nrtel = JOptionPane.showInputDialog("Edit phone number");
    model.setValueAt(nrtel, jTable.getSelectedRow(), 1);
}

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to NrTel
    at Test.setValueAt(GUI.java:222)
    at GUI.modifyActionPerformed(GUI.java:133)
    at GUI.access$000(GUI.java:6)
    at GUI$1.actionPerformed(GUI.java:47)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6527)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6292)
    at java.awt.Container.processEvent(Container.java:2234)
    at java.awt.Component.dispatchEventImpl(Component.java:4883)
    at java.awt.Container.dispatchEventImpl(Container.java:2292)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
    at java.awt.Container.dispatchEventImpl(Container.java:2278)
    at java.awt.Window.dispatchEventImpl(Window.java:2739)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:719)
    at java.awt.EventQueue$4.run(EventQueue.java:717)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Answer 1

<强>更新

错误在modifyActionPerformed方法中。问题是第1列（电话列）的编辑器需要NrTel个对象，而不是string，因此必须将string解析为int，然后喂到桌子里。

以下是一种可以解决问题的更新方法：

private void modifyActionPerformed(java.awt.event.ActionEvent evt) {                                       
         // TODO add your handling code here:
        System.out.println("HERE");
        String tel = JOptionPane.showInputDialog("Edit phone number");
        NrTel nrtel = new NrTel(Integer.parseInt(tel));
        jTable.getModel().setValueAt(nrtel, 0, 1);
}

旧答案：

我认为错误来自modifyActionPerformed方法中的第134行。

这是你的代码：

model.setValueAt(nrtel, jTable.getSelectedRow(), 3);

这是更新的代码：

jTable.getModel().setValueAt(nrtel, jTable.getSelectedRow(), 0);

如果模型对象与jTable具有相同的引用号，则第一部分jTable.getModel()不是必需的，但使用访问器方法可能是个好主意。

第二部分与列的编号有关。这些列设置为数组，从0开始。由于只有2列，我认为第三个参数可以介于0和1之间。

这有帮助吗？

Answer 2

打电话的时候 model.setValueAt（nrtel，jTable.getSelectedRow（），3）;

第136行

没有案例＆＃39; 3＆＃39;在setValueAt（）方法的开关中，所以没有任何更新

我尝试更改为model.setValueAt(nrtel, jTable.getSelectedRow(), 1);以便

调用

abonat.setNrTel((NrTel)aValue);，但是无法将aValue强制转换为输入NrTel ...

猜猜你应该改为abonat.setNrTel(new NrTel(aValue))

JTable单元在用户输入后不改变值

2 个答案: