Java doubts about ActionEvent

Question

this is my first question on this website. I have this problem, in this class I have two buttons with two different functions, one to exit and another to put the first and last name in a text field. I can't get the second ActionEvent to work, please help me, thanks.

import javax.swing.*;
import java.awt.event.*;

public class Prueba1 extends JFrame implements ActionListener{
    
    private JLabel nombre, apellidos,respondo;
    private JTextField textfield, textfield1;
    private JButton boton,botonoff;
    
    public Prueba1() {
        setLayout(null);
        
        nombre = new JLabel("Nombre:");
        nombre.setBounds(10, 10, 300, 30);
        add(nombre);
        
        apellidos = new JLabel("Apellidos");
        apellidos.setBounds(10, 40, 300, 30);
        add(apellidos);
        
        textfield = new JTextField();
        textfield.setBounds(100,10,150,20);
        add(textfield);
        
        textfield1 = new JTextField();
        textfield1.setBounds(100,40,150,20);
        add(textfield1);
        
        boton = new JButton("¿Que saldrá?");
        boton.setBounds(10,80,120,30);
        boton.addActionListener(this);
        add(boton);
        
        botonoff = new JButton("Salir");
        botonoff.setBounds(10,120,120,30);
        botonoff.addActionListener(this);
        add(botonoff);
        
        respondo = new JLabel("UwU");
        respondo.setBounds(160,80,300,30);
        add(respondo);
    }
    
    public void actionPerformed(ActionEvent e) {
        
        
        if(e.getSource() == boton) {
            String nombreyapellidos, nombre1, apellidos1;
            nombre1 = textfield.getText();
            apellidos1 = textfield1.getText();
            
            nombreyapellidos = nombre1 + apellidos1;
            
            respondo.setText(nombreyapellidos);
            
        }
        
    
    
    }
    
public void actionPerformed1(ActionEvent e) {
        
        
        if(e.getSource() == botonoff) {
            System.exit(0);
            
            
        }
    
    }
    
    public static void main(String args[]) {
        
        Prueba1 clase = new Prueba1();
        clase.setVisible(true);
        clase.setBounds(0, 0, 500, 500);
        clase.setResizable(true);
        clase.setLocationRelativeTo(null);
    }
    
}

Answer 1

Remove public void actionPerformed1(ActionEvent e) method and add the body of that method in the else branch in the body of public void actionPerformed(ActionEvent e).

  public void actionPerformed(ActionEvent e) {

    if (e.getSource() == boton) {
      String nombreyapellidos, nombre1, apellidos1;
      nombre1 = textfield.getText();
      apellidos1 = textfield1.getText();

      nombreyapellidos = nombre1 + apellidos1;

      respondo.setText(nombreyapellidos);

    } else if (e.getSource() == botonoff) {
      System.exit(0);
    }

  }