Question

我有一个客户端/服务器程序。该程序的目标是使用套接字将数据数组发送到客户端，将数据显示到表中，然后能够编辑它并将其发送回服务器进行存储。程序编译正常，但运行时客户端不会将数组输出到表中。它显示错误：

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to client.Network
    at client.MyTableModel.getValueAt(MyTableModel.java:77)



MyTableModel class: 

package client;

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

public class MyTableModel extends AbstractTableModel {

        void setData(ArrayList<Network> serversArray) {
        data = serversArray;
        System.out.print(this.data +"\n");
        System.out.print(serversArray + "\n");

    }    

  ArrayList<Network> data = new ArrayList();
        String[] headers = {"NetworkID","Nodes","Hubs","Switches","Structure","Country","Status"};


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

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

    @Override
    public void setValueAt(Object value, int row, int col) {

        switch (col) {
                case 0:
                    data.get(row).setNetworkID((int) value);
                    break;
                case 1:
                    data.get(row).setNodes((int) value);
                    break;
                case 2:
                    data.get(row).setHubs((int) value);
                    break;
                case 3:
                    data.get(row).setSwitches((int) value);
                    break;
                case 4:
                    data.get(row).setStructure("");
                    break;
                case 5:
                    data.get(row).setCountry("");
                    break;
                case 6:
                    data.get(row).setStatus("");
                    break;
                }

                fireTableCellUpdated(row, col);
    }
    @Override
    public String getColumnName(int col)
    { return headers[col];  }


    @Override
    public Object getValueAt(int row, int col) {

      switch (col) {
      case 0:
        return data.get(row).getNetworkID();
      case 1:
        return data.get(row).getNodes();
      case 2:
        return data.get(row).getHubs();
      case 3:
        return data.get(row).getSwitches();
      case 4:
        return data.get(row).getStructure();
      case 5:
        return data.get(row).getCountry();
      case 6:
        return data.get(row).getStatus();
      }
    return 0;
   }
}

Network class:

public class Network implements Serializable{

        private int NetworkID;
        private int Nodes;
        private int Hubs;
        private int Switches;
        private String Structure;
        private String Country;
        private String Status;


        public int getNetworkID(){
           System.out.println(this.NetworkID);
            return this.NetworkID;
        }

        public int getNodes(){
            return this.Nodes;
        }

        public int getHubs(){
            return this.Hubs;
        }

        public int getSwitches(){
            return this.Switches;
        }

        public String getStructure(){
            return this.Structure;
        }

        public String getCountry(){
            return this.Country;
        }

        public String getStatus(){
            return this.Status;
        }

        public void setNetworkID(int networkID){
            this.NetworkID = networkID;
            System.out.print(this.NetworkID);
        }

        public void setNodes(int nodes){
            this.Nodes = nodes;
        }

        public void setHubs(int hubs){
            this.Hubs = hubs;
        }

        public void setSwitches(int switches){
            this.Switches = switches;
        }

        public void setStructure(String structure){
            this.Structure = structure;
        }

        public void setCountry(String country){
            this.Country = country;
        }

        public void setStatus(String status){
            this.Status = status;
        }


    }

非常感谢任何帮助！

更新

private void displayNetworksActionPerformed(java.awt.event.ActionEvent evt) {                                                
   pw.println("SendCSV");

  // receieve data array from server     


  try {
      serversArray =  (ArrayList<Network>)ois.readObject();
      System.out.print(serversArray);

      statusBar.setText("Object Recieved from Server!");
  } catch (ClassNotFoundException ex) {
      statusBar.setText("Didnt Recieve Object");
  } catch (IOException ex) {
     statusBar.setText("Unable to Request");
  }

   // 4. update jtable
  this.myTableModel.setData(serversArray);
  this.myTableModel.fireTableDataChanged();


 }

更新：我仍然有这个问题，是否有人可以帮助解决方案？

在AbstractTable模型中使用getValueAt时收到ClassCastException

0 个答案: