Swing - catching click button event

Presented below is an example for catching button click event in Swing.

Code:

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public class TestEventSwing extends JApplet implements ActionListener {
  JButton b1, b2;
  JTextField t1;

  public void init() {
    setLayout(new FlowLayout());
    t1 = new JTextField(30);
    b1 = new JButton("Output");
    add(b1); add(t1);
    b2 = new JButton("Fire event 1st button");
    add(b2);

    b1.addActionListener(this);
    b2.addActionListener(this);
    }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == b1) {
      t1.setText("first button clicked");
      }
    if (e.getSource() == b2) {
      //  from the b2 button, we trigger a click on the b1 button.
      //  As an added bonus, a visual effect on b1 is visible!
      b1.doClick();
      }
    }
}

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