mine

import java.awt.*;

import javax.swing.*;


public class Panel extends JFrame {

    public Panel(){
        this.setSize(350,300);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setTitle("Kawaii Title <3");
        initControles();
    }

    private void initControles(){

        JPanel zoneClient = (JPanel) this.getContentPane();
        zoneClient.setLayout(new BorderLayout());

        //panneaux

        JPanel panSelection = new JPanel(new BorderLayout());
        JPanel panIdentite = new JPanel();
        JPanel panCalculette = new JPanel();
        JPanel panComplement = new JPanel();
        JTabbedPane tabPrincipal = new JTabbedPane();
        tabPrincipal.addTab("Sélection", panSelection);
        tabPrincipal.addTab("Identité", panIdentite);
        tabPrincipal.addTab("Calculette", panCalculette);
        tabPrincipal.addTab("Complément", panComplement);

        zoneClient.add(tabPrincipal);

        //Selection

        JPanel tabSelUp = new JPanel(new FlowLayout(FlowLayout.LEFT));
        tabSelUp.add(new JLabel("Choisir un individu:"));

        DefaultListModel<String> listData = new DefaultListModel();
        JList<String> maListe = new JList<String>(listData);
        String[] liste = {"Machin", "Truc" ,"Bidule", "Chose", "Stuff", "Thing", "Thingy" };
        maListe.setListData(liste);
        //maListe.setVisibleRowCount(4);
        maListe.setSelectedIndex(1);
        maListe.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        //tabSelMid.add(maListe);
        JScrollPane tabSelMid = new JScrollPane(maListe);
        JPanel tabSelDown = new JPanel(new FlowLayout( FlowLayout.RIGHT));
        tabSelDown.add(new JButton("Ok"));

        //panSelection
        panSelection.add(tabSelUp, BorderLayout.NORTH);
        panSelection.add(tabSelMid, BorderLayout.CENTER);
        panSelection.add(tabSelDown, BorderLayout.SOUTH);

        //Identite

        JPanel panIDleft = new JPanel();
        panIDleft.setLayout(new BoxLayout(panIDleft, BoxLayout.Y_AXIS));


        JPanel panIDup = new JPanel();
        panIDup.setLayout(new BoxLayout(panIDup,  BoxLayout.X_AXIS));
        panIDup.add(new JLabel("Nom  "));
        panIDup.add(new JTextField(10));

        JPanel panIDmid = new JPanel();
        panIDmid.setLayout(new BoxLayout(panIDmid,  BoxLayout.X_AXIS));
        panIDmid.add(new JLabel("Prénom  "));
        panIDmid.add(new JTextField(10));

        JPanel panIDdown = new JPanel();
        panIDdown.setLayout(new BoxLayout(panIDdown,  BoxLayout.X_AXIS));
        panIDdown.add(new JLabel("Sexe  "));
        JRadioButton male =new  JRadioButton("Homme  ");
        JRadioButton female = new JRadioButton("femme  ");

        ButtonGroup grpOption = new ButtonGroup();
        grpOption.add(male);
        grpOption.add(female);
        panIDdown.add(male);
        panIDdown.add(female);

        JPanel panIDlower = new JPanel();
        panIDlower.setLayout(new BoxLayout(panIDlower,  BoxLayout.X_AXIS));
        panIDlower.add(new JLabel("Age  "));
        panIDlower.add(new JTextField(10));


        panIDleft.add(panIDup);
        panIDleft.add(panIDmid);
        panIDleft.add(panIDdown);
        panIDleft.add(panIDlower);

        panIdentite.setLayout(new FlowLayout(FlowLayout.LEFT));
        panIdentite.add(panIDleft);

        //calculette



    }

    public static void main (String[] args){
        Panel test = new Panel();
        test.setVisible(true);




    }

}