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java中的按钮没有做动作

我正在从事Java任务.我有很多连接在一起的类,其中一个构造函数如下:

public class RemovePatientForm extends JFrame implements ActionListener {


        JPanel northPanel = new JPanel();
        JPanel southPanel = new JPanel();
        JPanel midPanel = new JPanel();
        JLabel removeLabel = new JLabel("Please type in the ID of the patient to be removed");
        JLabel idLabel= new JLabel("ID");
        JTextField idText=new JTextField();
        JButton submit = new JButton("Submit");
        JButton reset = new JButton("Clear");
        boolean externalForm = false;



        public RemovePatientForm(){

            setTitle("Removing a patient");
            setLayout(new BorderLayout());
            setSize(400,200);
            setLocationRelativeTo(null);
            setVisible(true);
            setResizable(false);

            add("North", northPanel);
            add("South", southPanel);
            northPanel.add(removeLabel);
            southPanel.add(submit);
            southPanel.add(reset);

            add(idLabel);
            add(idText); …
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