我可以使用setValueAt（）更新TableModel，但在表中看不到更改

Question

我可以使用setValueAt（）更新TableModel，但在表 中不可見更改，代碼如下：

import javax.swing.JFrame; 
    import javax.swing.JDialog; 
    import javax.swing.JPanel; 
    import javax.swing.JScrollPane; 
    import javax.swing.JTable; 
    import javax.swing.table.AbstractTableModel; 
    import java.awt.Dimension; 
    import java.awt.GridLayout; 

public class TableFTFEditDemo extends JPanel { 
private boolean DEBUG = true; 
JTable table; 
MyTableModel tableModel=new MyTableModel(); 

public TableFTFEditDemo() { 
    super(new GridLayout(1,0)); 

    table = new JTable(tableModel); 
    table.setPreferredScrollableViewportSize(new Dimension(500, 70)); 
    table.setFillsViewportHeight(true); 

    //Create the scroll pane and add the table to it. 
    JScrollPane scrollPane = new JScrollPane(table); 

    //Set up stricter input validation for the integer column. 
    table.setDefaultEditor(Integer.class, 
          new IntegerEditor(0, 100)); 

//If we didn't want this editor to be used for other 
//Integer columns, we'd do this: 
//table.getColumnModel().getColumn(3).setCellEditor(
// new IntegerEditor(0, 100)); 

    //Add the scroll pane to this panel. 
    add(scrollPane); 
} 

class MyTableModel extends AbstractTableModel { 
    private String[] columnNames ; 
    private Object[][] data; 
    MyTableModel(){ 
    columnNames=new String[] {"First Name","Last Name","Sport","# of Seaters","Vegetarian","blank"}; 
    data=new Object[][] { 
      {"Kathy", "Smith", 
      "Snowboarding", new Integer(5), new Boolean(false),"sdf"}, 
      {"John", "Doe", 
      "Rowing", new Integer(3), new Boolean(true),"reytry"}, 
      {"Sue", "Black", 
      "Knitting", new Integer(2), new Boolean(false),"wwttu"}, 
      {"Jane", "White", 
      "Speed reading", new Integer(20), new Boolean(true),"yuiyio"}, 
      {"Joe", "Brown", 
      "Pool", new Integer(10), new Boolean(false),"ertey"} 
    }; 
} 
    public int getColumnCount() { 
     return columnNames.length; 
    } 

    public int getRowCount() { 
     return data.length; 
    } 

    public String getColumnName(int col) { 
     return columnNames[col]; 
    } 

    public Object getValueAt(int row, int col) { 
     return data[row][col]; 
    } 

    /* 
    * JTable uses this method to determine the default renderer/ 
    * editor for each cell. If we didn't implement this method, 
    * then the last column would contain text ("true"/"false"), 
    * rather than a check box. 
    */ 
    public Class getColumnClass(int c) { 
     return getValueAt(0, c).getClass(); 
    } 

    public boolean isCellEditable(int row, int col) { 
     //Note that the data/cell address is constant, 
     //no matter where the cell appears onscreen. 
     if (col < 2) { 
      return false; 
     } else { 
      return true; 
     } 
    } 

    public void setValueAt(Object value, int row, int col) { 
     if (DEBUG) { 
      System.out.println("Setting value at " + row + "," + col 
           + " to " + value 
           + " (an instance of " 
           + value.getClass() + ")"); 
     } 

     data[row][col] = value; 
     this.fireTableCellUpdated(row,col); 

     if (DEBUG) { 
      System.out.println("New value of data:"); 
      printDebugData(); 
     } 
    } 

    private void printDebugData() { 
     int numRows = getRowCount(); 
     int numCols = getColumnCount(); 

     for (int i=0; i < numRows; i++) { 
      System.out.print(" row " + i + ":"); 
      for (int j=0; j < numCols; j++) { 
       System.out.print(" " + data[i][j]); 
      } 
      System.out.println(); 
     } 
     System.out.println("--------------------------"); 
    } 
} 

/** 
* Create the GUI and show it. For thread safety, 
* this method should be invoked from the 
* event-dispatching thread. 
*/ 
private static void createAndShowGUI() { 
    //Create and set up the window. 
    JFrame frame = new JFrame("TableFTFEditDemo"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    //Create and set up the content pane. 
    TableFTFEditDemo newContentPane = new TableFTFEditDemo(); 
    newContentPane.setOpaque(true); //content panes must be opaque 
    frame.setContentPane(newContentPane); 

    //Display the window. 
    frame.pack(); 
    frame.setVisible(true); 
} 

public static void main(String[] args) { 
    //Schedule a job for the event-dispatching thread: 
    //creating and showing this application's GUI. 
    javax.swing.SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowGUI(); 
     } 
    }); 
} 
void runtable(){ 

    javax.swing.SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowGUI(); 
      tableModel.setValueAt(new Integer(5),2,5); 
    ((AbstractTableModel)table.getModel()).fireTableCellUpdated(2,5); 
     } 
    }); 
} 
/** using this to call setValueAt from other classes*/ 
public void setValueAt1(Object value, int row, int col) { 
    table.setValueAt(new Integer(5),row,col); 
    ((AbstractTableModel)table.getModel()).fireTableCellUpdated(row,col); 
    } 
} 

PS：代碼取自frm oracle'example ..我只是想知道如何反映表中tablemodel所做的更改。

Answer 1

您的代碼按預期工作，只是您實際上沒有在模型上調用setValueAt()。你的runtable（）方法永遠不會被調用。

要驗證，更改createAndShowGUI()返回newContentPane並使用以下主要：

static TableFTFEditDemo instance; 

    public static void main(String[] args) throws Exception { 
    SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      instance = createAndShowGUI(); 
     } 
    }); 
    Thread.sleep(5000); 
    SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      instance.tableModel.setValueAt(5, 2, 5); 
     } 
    }); 
} 

編程的5秒的延遲後，在列中的值2行5將來自「wwtu改變「變成」5「。