Start builing Gui, demo creates 2 because the first one doesnt load

src/part5/Demo.java

@@ -0,0 +1,10 @@
+package part5;
+
+public class Demo {
+    public static void main(String[] args) {
+        for (int i = 0; i < 2; i++) {
+            Window w = new Window("My Java GUI");
+            w.display();
+        }
+    }
+}

src/part5/Window.java

@@ -0,0 +1,88 @@
+package part5;
+
+import javax.swing.*;
+import javax.swing.text.html.HTMLEditorKit;
+import java.awt.*;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+
+public class Window {
+    private String title;
+
+    public Window(String title){
+        this.title = title;
+    }
+
+    public JFrame setup(int height, int width){
+        JFrame w = new JFrame();
+        w.setVisible(true);
+        w.setSize(width,height);
+        w.setTitle(this.title);
+        w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        return w;
+    }
+
+    public void display() {
+        JFrame w = setup(700,700);
+
+        JPanel contentPane = new JPanel();
+
+        JButton textFeld = new JButton("Ich bin eine Beschriftung und lebe in einem Button");
+        contentPane.add(textFeld);
+
+        JTextField text = new JFormattedTextField("Hello, I am a formatted Text field \nThis Linebreak may work");
+        contentPane.add(text);
+
+        JLabel vorname = new JLabel("Vorname");
+        JLabel nachname = new JLabel("Nachname");
+        JLabel MatrikelNr = new JLabel("MatrikelNR.");
+        JLabel password = new JLabel("Passwort");
+        JLabel longText = new JLabel("Langer Text");
+
+        JTextField feldVorName = new JTextField(10);
+        JTextField feldNachName = new JTextField(10);
+        JPasswordField feldPassw = new JPasswordField(10);
+        JTextArea feldLongText = new JTextArea(20,15);
+
+        contentPane.add(vorname);
+        contentPane.add(feldVorName);
+        contentPane.add(nachname);
+        contentPane.add(feldNachName);
+        contentPane.add(password);
+        contentPane.add(feldPassw);
+
+        Icon i = new ImageIcon("Medien/Bilder/HackerUnicorn_Schäbig.png");
+        JButton grafik = new JButton(i);
+        contentPane.add(grafik);
+
+        contentPane.add((MatrikelNr));
+        contentPane.add(longText);
+        contentPane.add(feldLongText);
+
+
+        w.setContentPane(contentPane);
+
+
+        JMenuBar menuebar = new JMenuBar();
+        JMenu file = new JMenu("file");
+        JMenu help = new JMenu("help");
+
+        menuebar.add(file);
+        menuebar.add(help);
+
+        JMenuItem fileOpen = new JMenuItem("open");
+        JMenuItem fileClose = new JMenuItem("close");
+        JMenuItem fileEdit = new JMenuItem("edit");
+        JMenuItem helpInfo = new JMenuItem("info");
+        JMenuItem helpUnsub = new JMenuItem("unsubscribe");
+
+        file.add(fileOpen);
+        file.add(fileEdit);
+        file.add(fileClose);
+        help.add(helpInfo);
+        help.add(helpUnsub);
+
+        w.setJMenuBar(menuebar);
+    }
+}