first panel of GUI

src/gui/Gui.java

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+package gui;
+
+import javax.swing.JFrame;
+
+public class Gui{
+
+  public static void main(String[] args) {
+    MainWindow win = new MainWindow();
+  }
+
+
+}

src/gui/MainWindow.java

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+package gui;
+
+import javax.swing.JFrame;
+
+public class MainWindow extends JFrame{
+
+    public MainWindow(){
+      JFrame fenetre = new JFrame();
+      fenetre.setTitle("Client");
+      fenetre.setSize(550, 200);
+      fenetre.setLocationRelativeTo(null);
+      fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+      fenetre.add(new Parameters());
+      fenetre.setVisible(true);
+    }
+
+}

src/gui/Parameters.java

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+package gui;
+
+import javax.swing.JPanel;
+import javax.swing.JLabel;
+import javax.swing.JButton;
+import javax.swing.JTextField;
+import javax.swing.JComboBox;
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.GridLayout;
+
+public class Parameters extends JPanel{
+
+  private JLabel label1, label2, label3, label4, label5;
+  private JTextField field1, field2, field3, field4;
+  private JButton connectButton;
+  private JComboBox<String> protocolSelector;
+
+  public Parameters(){
+    JPanel p1 = new JPanel();
+    p1.setLayout(new GridLayout(5, 2));
+    FlowLayout layout = new FlowLayout();
+    JPanel p2 = new JPanel();
+    p2.setLayout(layout);
+    String[] elements = {"TCP", "UDP"};
+    this.label1 = new JLabel("Server hostname: ");
+    this.label2 = new JLabel("Server port: ");
+    this.label3 = new JLabel("Tracker hostname: ");
+    this.label4 = new JLabel("Tracker port: ");
+    this.label5 = new JLabel("Protocol: ");
+    this.field1 = new JTextField(20);
+    this.field2 = new JTextField(20);
+    this.field3 = new JTextField(20);
+    this.field4 = new JTextField(20);
+    this.connectButton = new JButton("Connect");
+    protocolSelector = new JComboBox<>(elements);
+    p1.add(label1);
+    p1.add(field1);
+    p1.add(label2);
+    p1.add(field2);
+    p1.add(label3);
+    p1.add(field3);
+    p1.add(label4);
+    p1.add(field4);
+    p1.add(label5);
+    p1.add(protocolSelector);
+    p2.add(connectButton);
+    this.add(p1, BorderLayout.NORTH);
+    this.add(p2, BorderLayout.SOUTH);
+    setVisible(true);
+  }
+
+}