Thread: JLabel gets the size of the window when I press a button

Hello, I wanna create a timer in Java, starting with the run button and the label of the time, but when I press the button, the label gets the size of the window, and I don't know why, what's wrong? (I wanted upload captures, but I couldn't for some reason).

import javax.swing.*;
import java.awt.*;
 
public class Temporizador extends JFrame {
    private final JLabel tiempo;
    private final JButton iniciar;
 
    public static void main(String[] args) {
        new Temporizador();
    }
 
    public Temporizador() {
        setTitle("Temporizador");
        setSize(800, 600);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setResizable(false);
        setLocationRelativeTo(null);
        setVisible(true);
 
        tiempo = new JLabel();
        tiempo.setLocation(0, 30);
        tiempo.setSize(200, 60);
        tiempo.setPreferredSize(new Dimension(200, 60));
        tiempo.setOpaque(true);
        tiempo.setBackground(Color.WHITE);
        tiempo.setText("00:00:00");
 
        iniciar = new JButton();
        iniciar.setText("Correr");
        iniciar.setLocation(0, 0);
        iniciar.setSize(100, 30);
        iniciar.setPreferredSize(new Dimension(100, 30));
        iniciar.setVisible(true);
        iniciar.addActionListener((event) -> {
            tiempo.setText("00:00:01");
        });
 
        add(iniciar);
        add(tiempo);
    }
}

when I press the button, the label gets the size of the window,

Try adding the label to a panel and then adding the panel to the frame.

Also don't call setVisible until after the gui has been updated.

You can use setLocation on a component if the container it is in does not have a layout manager. Set the layout manager to null to remove it.