我想在单击按钮时更新表格

Question

我是 Swing 的新手。

我想在点击按钮（完成按钮）后更新表格。 我认为数据正确，但屏幕无法正常工作。

以下是我的程序的解释

1. 选中复选框并单击完成按钮
2. 底层应该改变。
3. 没有主目录

这是我的代码：

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableModel;

import net.miginfocom.swing.MigLayout;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Gui extends JFrame {

    class Table extends JTable{
        public Table(DefaultTableModel model) {
            super(model);
        }
        public Class getColumnClass(int column) {
            switch (column) {
            case 1:
                return Boolean.class;
            default:
                return String.class;
            }
        }
    }

    private final int BANDNUM = 43;
    int[] checkBands;
    Object[][] data;
    Table table;
    JScrollPane upperScrollpane;
    JScrollPane downScrollPane;
    JSplitPane splitPane;

    public Gui() {

        // BASE SETTING
        setSize(900, 800);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BorderLayout(5, 5));

        JPanel northPanel = new JPanel(new MigLayout());

        // northPanel SETTING
        JLabel labelIp = new JLabel("IP");
        JTextField tFIp = new JTextField(20);

        JLabel labelMask = new JLabel("Subnet Mask");
        JTextField tFMask = new JTextField(20);

        JLabel labelPing = new JLabel("Ping");
        JTextField tFPing = new JTextField(10);

        JButton btnReady = new JButton("Ready");
        JLabel labelReady = new JLabel("NOT READY");

        northPanel.add(labelIp);
        northPanel.add(tFIp);
        northPanel.add(labelMask);
        northPanel.add(tFMask);
        northPanel.add(labelPing);
        northPanel.add(tFPing);
        northPanel.add(btnReady);
        northPanel.add(labelReady, "wrap");

        // upper scrollpane -> will be included in JsplitPane Upper Side
        JPanel checkPanel = new JPanel(new MigLayout());

        JCheckBox[] checkBoxes = new JCheckBox[BANDNUM];
        JButton doneButton = new JButton("DONE");

        for (int i = 0; i < BANDNUM; i++) {
            checkBoxes[i] = new JCheckBox("" + (i + 1));
            checkBoxes[i].setHorizontalTextPosition(SwingConstants.CENTER);
            checkBoxes[i].setVerticalTextPosition(SwingConstants.BOTTOM);
            if (i == 32) {
                checkPanel.add(checkBoxes[i], "wrap");
            } else if (i == 42) {
                checkPanel.add(checkBoxes[i], "wrap");
            } else {
                checkPanel.add(checkBoxes[i]);
            }
        }

        checkPanel.add(doneButton, "span 3");

        // startButton Action

        /////////////////////////////////////////
        //I think you should watch from this line!!!
        /////////////////////////////////////////
        doneButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // 1. CHECK WHAT ARE CLICKED
                int length = 0;
                for (int i = 0; i < BANDNUM; i++)
                    if (checkBoxes[i].isSelected())
                        length++;
                checkBands = new int[length];

                System.out.println(length);

                int k = 0;
                for (int i = 0; i < BANDNUM; i++) {
                    if (checkBoxes[i].isSelected()) {
                        checkBands[k++] = i + 1;
                    }
                }

                // 2. Ready for display
                data = new Object[length][6];
                for (int i = 0; i < length; i++) {
                    data[i][0] = checkBands[i];
                    data[i][1] = true;
                    data[i][2] = 1;
                    data[i][3] = 2;
                    data[i][4] = 3;
                    data[i][5] = 4;
                }

                // 3. display
                String[] colNames = { "BAND", "Test1", "Test2", "Test3",
                        "Test4", "Test5" };
                DefaultTableModel model = new DefaultTableModel(data, colNames);
                table = new Table(model);
                setVisible(true);
                table.repaint();
                downScrollPane.repaint();
                splitPane.repaint();
            }
        });

        // down scrollpane -> will be included in JsplitPane down Side
        String[] colNames = { "BAND", "Test1", "Test2", "Test3", "Test4",
                "Test5" };
        Object[][] data = { { null, null, null, null, null, null }};
        DefaultTableModel model = new DefaultTableModel(data, colNames);
        table = new Table(model);

        // include
        upperScrollpane = new JScrollPane(checkPanel);
        downScrollPane = new JScrollPane(table);

        splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, upperScrollpane, downScrollPane);

        mainPanel.add(northPanel, BorderLayout.NORTH);
        mainPanel.add(splitPane, BorderLayout.CENTER);
        getContentPane().add(mainPanel);

        setVisible(true);

    }

}

Answer 1

而不是这样做......

String[] colNames = { "BAND", "Test1", "Test2", "Test3",
                    "Test4", "Test5" };
DefaultTableModel model = new DefaultTableModel(data, colNames);
table = new Table(model);

只需更新现有模型

DefaultTableModel model = (DefaultTableModel)table.getModel();
for (Object[] row : data) {
    model.addRow(row);
}

或者干脆

DefaultTableModel model = (DefaultTableModel)table.getModel();
for (int i = 0; i < length; i++) {
    data = new Object[6];
    data[0] = checkBands[i];
    data[1] = true;
    data[2] = 1;
    data[3] = 2;
    data[4] = 3;
    data[5] = 4;
    model.addRow(data);
}

这假设您要继续向表中添加新行。您也可以使用model.setRowCount(0) 先清除表格，然后再向其中添加新行，如果您愿意的话。

Swing 采用 MVC (Model-View-Controller) 原理，将视图 (JTable) 与数据/模型 (TableModel) 分开，这意味着 JTable 不绑定到数据并且可以只需更改或修改表的模型即可轻松更改或修改。这是一个需要理解的重要概念，因为 Swing 大量使用了这种方法