Question

我正在尝试构建一个GUI，显示一些用于矢量路由的数据，但是我没有尝试获取表中的信息以在物理表上更新。只有在按下按钮时才会从程序中更改数据（无用户交互）。

这是我的驱动程序类：

public class DistanceVectorRouting {

    public static void main(String[] args) {
        DistanceVectorRoutingUI gui = new DistanceVectorRoutingUI();
        gui.turnOnGUI();

        System.out.println(gui.routerTable1.getValueAt(0, 1));

        gui.routerTable1.setValueAt("foo", 0, 1);
        System.out.println(gui.routerTable1.getValueAt(0, 1));
        //fireTableDataChanged();
    }

}

这是我初始化并添加一个监听器的地方：

public class DistanceVectorRoutingUI extends JFrame {

    /**
     * Creates new form DistanceVectorRoutingUI
     */
    public DistanceVectorRoutingUI() {
        initComponents();
    }

private void initComponents() {

routerTable1 = new javax.swing.JTable();
        routerTable1.setModel(new MyTableModel());
        routerTable1.getModel().addTableModelListener(new TableModelListener() {

            public void tableChanged(TableModelEvent e) {
                System.out.println(e);
            }
        });
}

public static void turnOnGUI() {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(DistanceVectorRoutingUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(DistanceVectorRoutingUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(DistanceVectorRoutingUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(DistanceVectorRoutingUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DistanceVectorRoutingUI().setVisible(true);
            }
        });
    }

这是MyTableModel类：

public class MyTableModel extends AbstractTableModel implements TableModelListener {

    private String[] columnNames = {"Destination", "Distance"};
    private Object[][] data = {{"1", "1"},
                               {"2", "1"},
                               {"3", "1"},
                               {"4", "1"},
                               {"5", "1"},
                               {"6", "1"}};
@Override
    public int getColumnCount() {
        return columnNames.length;
    }

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

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

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


    @Override
    public Class getColumnClass(int c) {
        return getValueAt(0, c).getClass();
    }


    @Override
    public boolean isCellEditable(int row, int col) {
        if (col < 2) {
            return false;
        } else {
            return true;
        }
    }


    @Override
    public void setValueAt(Object value, int row, int col) {
        this.data[row][col] = value;
        System.out.println(this.data[row][col]);
        fireTableDataChanged();
    }
}

每当我调用setValueAt（）时，我都会在main方法中执行，一切正常（单元格被更新并调用tableChanged）。

我知道我不应该在tableChanged方法中只有一个print语句，但我不确定该放在那里，我认为这就是我的问题所在。

有人能指出我正确的方向，以便在我更改表格中显示的数据时实际更新吗？

谢谢！

Answer 1

看看发生了什么。 turnOnGUI()创建一个框架（并设置可见），没有参考。

new DistanceVectorRoutingUI().setVisible(true);

然后在另一个类中创建另一个帧（gui）。但是不要把它看得见。

DistanceVectorRoutingUI gui = new DistanceVectorRoutingUI();
gui.turnOnGUI();

你有两个框架实例。永远不会显示gui。

JTable不会刷新

1 个答案: