How do i position my components in GUI?

Code:

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

import java.util.Calendar;
public class buttons extends JFrame{
        //texts or labels or panels
        private JLabel level;
        private JLabel difficulties;
        private JLabel colour;
        private JTextField timeF;
        private JPanel panel;
        //buttons
        private JButton start;
        private JButton stop;
        private JButton settings;
        //combo boxes
        private JComboBox difficulty;
        private JComboBox color;
        //j frame
        private JFrame frame;
        //lsits for combobox
        private static String[] difflist = {"Easy", "Medium", "Hard"};
        private static String[] colorlist = {"White", "Black"};
        //for timer
        private static final long serialVersionUID = 1L;
       
        public buttons (){
                super("Chess");
                panel = new JPanel();
                panel.setBackground(Color.BLACK);
                //combo
                JComboBox color = new JComboBox(difflist);
                JComboBox diff = new JComboBox(colorlist);
                /////////
                add(color);
                add(diff);
                //buttons
                JButton start = new JButton("Start");
                JButton stop = new JButton("Stop");
                JButton settings = new JButton("Settings");
                /////////
                /////////
                add(start);
                add(stop);
                add(settings);
                ///////////////////////////////// TIMER ///////////////////////////////////               
                timeF = new JTextField(10);
                timeF.setEditable(false);
                timeF.setFont(new Font("Arial",Font.PLAIN,48));       
                panel.add(timeF);
                add(panel);
               
               
                Timer t = new Timer(1000, new Listener());
                t.start();
               
        }
        class Listener implements ActionListener{
                public void actionPerformed(ActionEvent e){
                        Font font = new Font("SansSerif",Font.BOLD,20);
                        Calendar rightNow = Calendar.getInstance();
                        int hour = rightNow.get(Calendar.HOUR_OF_DAY);
                        int min = rightNow.get(Calendar.MINUTE);
                        int sec = rightNow.get(Calendar.SECOND);
                        timeF.setText(hour+":"+min+":"+sec);
                        timeF.setBackground(Color.BLACK);
                        timeF.setForeground(Color.GREEN);
                        timeF.setFont(font);
                       
                }
}
}

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Code:

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import java.awt.FlowLayout;
import java.awt.Color;
import javax.swing.JList;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.ListSelectionEvent;

class Main extends JFrame {
 
  public static void main(String args[ ]) {
      Interface buttons = new Interface();
      buttons.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      buttons.setSize(900, 400);
      buttons.setVisible(true);
          buttons.setResizable(true);
          buttons.setLocationRelativeTo(null);
 
  }
}

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Hey guys.. I've been searching for hours already and still can't find the answer.. I wanted to position my components all of them just stack up to one another if i use this code..

You will have to go through this tutorial on layout managers.
Until you do you will have set yourself up for a ton of frustration.

This is not an advanced question; it is about Swing; I'm moving this thread.

kind regards,

Jos