🚀 go-pugleaf

Dear fellow developers,

When I clicked a component for instance a button, the event handler code as in below appears under Source tab. Could anyone please explain to me how it works and why does the action_Performed method appear two times, once by itself as a method and then another time under a class unknown to me called actionAdapter? All I want to do is just code one event handler that handles all button clicks, like so: 
public void button_actionPerformed(ActionEvent e, Object arg);
{   ...... etc  }

Here's theh code generated by JBuilder when I double-clicked a button:
 public void jButton10_actionPerformed(ActionEvent e) {
    }
}

class Frame2_jButton10_actionAdapter implements ActionListener {
    private Frame2 adaptee;
    Frame2_jButton10_actionAdapter(Frame2 adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jButton10_actionPerformed(e);
    }
}

Thanks in advance for explaining to me.