How do I use javax.swing.Timer?

[anonymous]

I'm trying to get my pieces to fall down when the timer is instantiated. This is my code so far, I'm just not sure what I'm doing wrong.
package lab7;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;

import lab7.piece.Piece;

public class TimerHandler extends JPanel implements ActionListener {
private Piece _myPiece;
private javax.swing.Timer _t;
private final int _i = 1000;
public TimerHandler(){
_t = new javax.swing.Timer(_i, this);
}
public void start(){
_t.start();
}

public void addActionListener(){

}
@Override
public void actionPerformed(ActionEvent e) {
_t.start();
_myPiece.moveDown();

}

}