Java：使用GridLayout输入矩阵 [英] Java: input a matrix using GridLayout

问题描述

我正在尝试编写一个可以使用GridLayout输入任意大小的矩阵的函数，但是因为我找不到一个合适的方法来提取JTextField值来填充'mat'var，所以我卡住了（参见下面的FIXME）。

I am trying to write a function that can input a matrix of any size using a GridLayout, but I'm stuck since I can't find an appropriate way of extracting the JTextField values to fill the 'mat' var (see FIXME below).

    /**
     * @mat: matrix declared in main (e.g: mat[][] = new int[3][3];)
     * @rows: number of matrix rows (e.g: int rows = 3;)
     * @columns: number of matrix columns (e.g: int columns = 3;)
     */
    public static int[][] inputMatrix(int[][] mat, int rows, int columns)
    {
        JPanel panel = new JPanel();     
        panel.setLayout(new GridLayout(rows,columns));

        for (int a=0; a<(rows*columns); a++)
        {
            panel.add(new JTextField(a));
        }

        if (JOptionPane.showConfirmDialog(null, panel, "Enter the matrix", JOptionPane.OK_CANCEL_OPTION)
                                        == JOptionPane.OK_OPTION)
        {
            for(int a=0; a<(rows*columns); a++){
                for(int b=0; b<rows; b++){
                    for(int c=0; c<columns; c++){
                        /* FIXME: find how to extract JTextField values. */
                        mat[b][c] = JTextField.a.getText();
                    }
                }
            }
        }

        return mat;
    }

预先感谢您的帮助！

推荐答案

• 使用 JTable 而不是一堆 JTextField 由 GridLayout


• use JTable instead of bunch of JTextField layed by GridLayout

或




• 添加 putClientProperty 并添加标识符行 a 列来自 GridLayout

• add there putClientProperty and to add identifier Row a Column from GridLayout

将 JTextField 放入 HashMap

我更喜欢 putClientProperty （你可以多重播放数字或额外的信息..，单独的 putClientProperty isn'以某种方式减少了）

I would be preferring putClientProperty (you can to multiplay number or additional infos.., number of separate putClientProperty isn't somehow reduced)

取决于（不清楚）设计，你可以将 ActionListener 添加到 JTextField （accelera tor是 ENTER键）或 DocumentListener

depends of (not clear) desing, you can to add ActionListener to JTextField (accelerator is ENTER key) or DocumentListener

虚拟示例， JButton 和 ActionListener 的代码示例， putClientProperty 可从所有方法访问或监听器添加到 JTextField

virtual example, code example for JButton and ActionListener, putClientProperty is accesible from all methods or Listeners added to JTextField

buttons[i][j].putClientProperty("column", i);
buttons[i][j].putClientProperty("row", j);
buttons[i][j].addActionListener(new MyActionListener());

从ActionListener获取（例如）

and get from ActionListener (for example)

public class MyActionListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        JButton btn = (JButton) e.getSource();
        System.out.println("clicked column " + btn.getClientProperty("column")
                + ", row " + btn.getClientProperty("row"));
}

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