package notenmanager; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; import java.awt.*; public class MainGUI extends JFrame { public MainGUI() { setTitle("Notenmanager"); setSize(960, 540); setLocationRelativeTo(null); setDefaultCloseOperation(EXIT_ON_CLOSE); Container pane = getContentPane(); GroupLayout groupLayout = new GroupLayout(pane); pane.setLayout(groupLayout); JButton button = new JButton("Test"); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.out.println("TEST erfolgreich"); } }); groupLayout.setVerticalGroup(groupLayout.createSequentialGroup().addComponent(button)); groupLayout.setHorizontalGroup(groupLayout.createSequentialGroup().addComponent(button)); groupLayout.setAutoCreateContainerGaps(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { MainGUI main = new MainGUI(); main.setVisible(true); } }); } }