Troubles with Swing Timer and ActionEvents

I'm trying to get a JLabel to display the dat开发者_StackOverflow中文版e and update every second. To do this I'm using Swing's Timer class and implementing my own class called DateTimer. DateTimer is also an ActionListener.

This is DateTimer:

public class DateTimer implements ActionListener {
    private int delay;
    private JLabel label;
    private Calendar cal;

    public DateTimer(int delay, JLabel label) {
        this.delay = delay;
        this.label = label;

        cal = Calendar.getInstance();
        new Timer(this.delay, this).start();
    }

    public void actionPerformed(ActionEvent e) {
        this.label.setText(this.cal.getTime().toString());
    }

}

I call this from somewhere else in my code like this:

new DateTimer(1000, this.label);

I get the date to display once, then it doesn't ever update.

I'm new to Java GUIs and handling actions so please excuse my ignorance.

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java.util.Calendar.getInstance() returns an object representing the current date and time at the time it is created. It doesn't update automatically as you are assuming.