JTextField ActionListener不响应事件

Question

I am writing a java application which displays the contents of a SQLite database.

I am trying to set up an ActionListener, so that the user can click on the field and the program will access the next table in the database.

The problem is the listener is not responding to the click.

Blow is the method I am using to create the JTextField and set up the listener:

public void text(JTextField jtf, String a, int x, int y, int wid, int hei){

        Font font = new Font("Courier", Font.BOLD,12);
        gbc=new GridBagConstraints();
        jtf=new JTextField(a);
            gbc.gridx=x;
            gbc.gridy=y;
            gbc.gridwidth = wid;
            gbc.gridheight=hei;
            gbc.fill=GridBagConstraints.BOTH;           
            add(jtf,gbc);
            jtf.setEditable(false);
            jtf.setHorizontalAlignment(JTextField.CENTER);
            jtf.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            jtf.setFont(font); 
            jtf.addActionListener(new ActionListener()
            {               @Override
                public void actionPerformed(ActionEvent arg0) {
                JOptionPane.showMessageDialog(null,"Pressed");
                }
            });

    }

Answer 1

ActionListener executes when the user has focus on the control and presses ENTER.

You should use a mouseListener in order to listen to events involving the mouse.

jtf.addMouseListener(new MouseAdapter(){
   public void mouseReleased(MouseEvent e) {
    JOptionPane.showMessageDialog(null,"Released");
   }

   public void mousePressed(MouseEvent e) {
    JOptionPane.showMessageDialog(null,"Pressed");
   }
}

You can also use a keyListener if you want to respond to the user changing the text.