JTable中刷新了新的數據

我有一個將數據加載到JTable中
我能夠加載新數據的JTable負載按鈕。

但是當我重新加載數據並點擊jcheckbox時，舊數據出現了。 我正在使用defaulttablemodel選項。請運行編，並幫助我在哪裏出錯了。JTable中刷新了新的數據

import java.awt.BorderLayout; 
import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JComponent; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.table.DefaultTableModel; 

public class MainWindow extends JFrame { 
JTable table; 
private static final int CHECK_COL = 3; 
    String[] columnNames = { 
    "Country", "Capital", "Population in Millions", "Democracy"}; 
    Object[][] data = { 
    {"USA", "Washington DC", 280, false}, 
    {"Canada", "Ottawa", 32, false}, 
    {"United Kingdom", "London", 60, false}, 
    {"Germany", "Berlin", 83, false}, 
    {"France", "Paris", 60, false}, 
    {"Norway", "Oslo", 4.5, false}, 
    {"India", "New Deli", 1046, false} 
    }; 
    DefaultTableModel dtm ; 
    // static JScrollPane scrollpane= new JScrollPane(); 
    public MainWindow() { 
    setTitle("Marking of data"); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    JButton button1 = new JButton("load"); 
    button1.addActionListener(new ActionListener() { 
    public void actionPerformed(ActionEvent e) { 
     if(dtm!=null){ 
      System .out .println("NOT EMPTY"); 
      int c = dtm.getRowCount(); 
     // for (int i=c-1; i>=0; i--) 
     // { 
      // dtm.removeRow(i); 
      // table.revalidate(); 
     // } 
      loadtable(); 
      } 
     if(dtm==null){ 
      System .out .println("EMPTY"); 
      loadtable(); 
     } 
     } 
     }); 

     JButton button = new JButton("check"); 
     button.addActionListener(new ActionListener() { 
     @Override 
     public void actionPerformed(ActionEvent e) { 
     for (int row = 0; row < table.getRowCount(); row++) { 
      Boolean b = ((Boolean) table.getValueAt(row, CHECK_COL)); 
      if (b.booleanValue()) { 
       System.out.print("row " + row + " is " + b + ": "); 
       for (int col = 0; col < table.getColumnCount(); col++) { 
        System.out.print(table.getValueAt(row, col) + " "); 
       } 
       System.out.println(); 
      } 
     } 
     } 
     }); 
     JPanel buttonpanel1 = new JPanel(); 
     buttonpanel1.add(button1); 
     JPanel buttonpanel = new JPanel(); 
     buttonpanel.add(button); 
     add(buttonpanel, BorderLayout.SOUTH); 
     add(buttonpanel1, BorderLayout.NORTH); 
     pack(); 
     setLocationByPlatform(true); 
     setVisible(true); 
     } 
     public void loadtable(){ 
    dtm = new DefaultTableModel(data, columnNames) { 
     @Override 
     public Class getColumnClass(int col) { 
      return getValueAt(0, col).getClass(); 
     } 
     @Override 
     public boolean isCellEditable(int rowIndex, int colIndex) { 
      return (colIndex == CHECK_COL); 
     } 
     }; 
     table = new JTable(dtm); 
     JScrollPane scrollpane = new JScrollPane(table); 
     add(scrollpane, BorderLayout.CENTER); 
     pack(); 
     setVisible(true); 
     } 


    public static void main(String args[]) { 
    EventQueue.invokeLater(new Runnable() { 
    @Override 
    public void run() { 
     new MainWindow(); 
     } 
    }); 
    } 
     }

需要幫助。請參考

來源

2012-02-07 user1101703

默認表模型將數據從二維數組複製到它自己的向量中。

每次按下加載按鈕時，都會使用相同的數據創建一個新的默認表模型，並向新的表模型的向量創建一個新副本。

您的代碼會在每次按下加載按鈕時重置表格模型，因此當然會出現舊數據。

來源

2012-02-08 15:18:15

JTable中刷新了新的數據

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