Question

所以我做了一些更改（给我的nullCs的generateCsvFile是底部的那个，我删除了我的Test（）方法中的那个）但它仍然说是null

        private class thehandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {

            if (e.getSource().equals(Nummer)) {
                NummerS = String.format(e.getActionCommand());

            } else if (e.getSource() == Locatie) {
                LocatiesS = String.format(e.getActionCommand());

            } else if (e.getSource() == Login) {
                LoginS = String.format(e.getActionCommand());

            } else if (e.getSource() == Datum) {
                DatumS = String.format(e.getActionCommand());

            } else if (e.getSource() == Nummer1) {
                Nummer1S = String.format(e.getActionCommand());

            } else if (e.getSource() == Nummer5) {
                Nummer5S = String.format(e.getActionCommand());

            } else if (e.getSource().equals(save)) {
                generateCsvFile("c:\\testss.csv");
                System.out.println(NummerS);
                System.out.println("Debug");
            }

        }

        // JOptionPane.showMessageDialog(null, string);


    }

Answer 1

在实例化处理程序之前，您似乎正在调用generateCsv（）方法。是的，您正在分配变量，但是在编写完文件后就是这样做了。把它改成这个。

public Test() {
    super("Plankske 1");
    setLayout(new FlowLayout());

    Nummer = new JTextField(10);
    add(Nummer);

    Locatie = new JTextField("980000119818");
    add(Locatie);

    Login = new JTextField(10);
    add(Login);

    Datum = new JTextField(10);
    add(Datum);

    Nummer1 = new JTextField(10);
    add(Nummer1);

    Nummer5 = new JTextField(10);
    add(Nummer5);

    save = new JButton("Save");
    add(save);


    thehandler handler = new thehandler();
    Nummer.addActionListener(handler);
    Locatie.addActionListener(handler);
    Login.addActionListener(handler);
    Datum.addActionListener(handler);
    Nummer1.addActionListener(handler);
    Nummer5.addActionListener(handler);
    save.addActionListener(handler);

    generateCsvFile("c:\\test.csv");

}

设置变量仍然返回null

1 个答案: