WindowGrades.java

package exam;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import javax.swing.JTextField;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.SwingConstants;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.BoxLayout;
import java.awt.Color;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;

public class WindowGrades extends JFrame {

	private JPanel contentPane;
	private JTextField txtGerman;
	private JTextField txtMaths;
	private JTextField textField;
	private JTextField textField_1;
	private JTextField textField_2;
	private JTextField textField_3;
	private JTextField textField_4;
	private JTextField textField_5;
	private JTextField textField_6;
	private JTextField textField_7;
	private JTextField textField_8;
	private JTextField textField_9;
	private JTextField textField_10;
	private JTextField textField_11;
	private JTextField textField_12;
	private JTextField textField_13;
	private JTextField textField_14;
	private JTextField textField_15;
	private JTextField textField_16;
	private JTextField textField_17;
	private JTextField textField_18;
	private JTextField textField_19;
	private JTextField textField_20;
	private JTextField textField_21;
	private JTextField textField_22;
	private JTextField textField_23;
	private JLabel label_1;
	private JLabel label_2;
	private JLabel label_3;
	private JLabel label_4;
	private JLabel lblDurchschnitt;
	private JLabel lblDs;
	private JLabel labelAverageGerman;
	private JLabel label_6;
	private JLabel label_7;
	private JLabel label_8;
	private JLabel label_9;
	private JButton btnSpeichern;
	private JButton btnSummieren;
	private JButton btnDurchschnitte;
	private JButton btnBeenden;
	private JLabel lblFremdsprache_1;
	private JTextField txtLanguage;
	private JLabel lblKernfach_2;
	private JTextField txtMainSubject4;
	private JLabel lblKernfach_3;
	private JTextField txtMainSubject5;
	private JPanel panel_1;
	private JLabel lblNotenverwaltungOberstufe;
	private JTextField txtSemester;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					WindowGrades frame = new WindowGrades();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public WindowGrades() {
		setTitle("Lucas Hild");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 1000, 400);
		contentPane = new JPanel();
		contentPane.setBackground(Color.GRAY);
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(new BorderLayout(0, 0));
		
		JPanel mainPanel = new JPanel();
		mainPanel.setBackground(Color.GRAY);
		contentPane.add(mainPanel, BorderLayout.CENTER);
		GridBagLayout gbl_mainPanel = new GridBagLayout();
		gbl_mainPanel.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0};
		gbl_mainPanel.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
		gbl_mainPanel.columnWeights = new double[]{1.0, 1.0, 1.0, 1.0, 1.0, 1.0, Double.MIN_VALUE};
		gbl_mainPanel.rowWeights = new double[]{1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 0.0, 1.0, Double.MIN_VALUE};
		mainPanel.setLayout(gbl_mainPanel);
		
		JPanel panel = new JPanel();
		panel.setBackground(Color.GRAY);
		GridBagConstraints gbc_panel = new GridBagConstraints();
		gbc_panel.gridwidth = 6;
		gbc_panel.insets = new Insets(0, 0, 5, 0);
		gbc_panel.fill = GridBagConstraints.BOTH;
		gbc_panel.gridx = 0;
		gbc_panel.gridy = 0;
		mainPanel.add(panel, gbc_panel);
		panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
		
		JLabel lblHj = new JLabel("HJ");
		panel.add(lblHj);
		
		txtSemester = new JTextField();
		panel.add(txtSemester);
		txtSemester.setColumns(10);
		
		JLabel lblDeutsch = new JLabel("Deutsch");
		panel.add(lblDeutsch);
		
		txtGerman = new JTextField();
		panel.add(txtGerman);
		txtGerman.setColumns(10);
		
		JLabel lblMathematik = new JLabel("Mathematik");
		panel.add(lblMathematik);
		
		txtMaths = new JTextField();
		panel.add(txtMaths);
		txtMaths.setColumns(10);
		
		lblFremdsprache_1 = new JLabel("Fremdsprache");
		panel.add(lblFremdsprache_1);
		
		txtLanguage = new JTextField();
		panel.add(txtLanguage);
		txtLanguage.setColumns(10);
		
		lblKernfach_2 = new JLabel("Kernfach 4");
		panel.add(lblKernfach_2);
		
		txtMainSubject4 = new JTextField();
		panel.add(txtMainSubject4);
		txtMainSubject4.setColumns(10);
		
		lblKernfach_3 = new JLabel("Kernfach 5");
		panel.add(lblKernfach_3);
		
		txtMainSubject5 = new JTextField();
		panel.add(txtMainSubject5);
		txtMainSubject5.setColumns(10);
		
		JLabel lblAuswertung = new JLabel("Auswertung");
		GridBagConstraints gbc_lblAuswertung = new GridBagConstraints();
		gbc_lblAuswertung.insets = new Insets(0, 0, 5, 5);
		gbc_lblAuswertung.gridx = 0;
		gbc_lblAuswertung.gridy = 1;
		mainPanel.add(lblAuswertung, gbc_lblAuswertung);
		
		JLabel lblHj_1 = new JLabel("HJ");
		GridBagConstraints gbc_lblHj_1 = new GridBagConstraints();
		gbc_lblHj_1.insets = new Insets(0, 0, 5, 5);
		gbc_lblHj_1.gridx = 0;
		gbc_lblHj_1.gridy = 2;
		mainPanel.add(lblHj_1, gbc_lblHj_1);
		
		JLabel lblDeutsch_1 = new JLabel("Deutsch");
		GridBagConstraints gbc_lblDeutsch_1 = new GridBagConstraints();
		gbc_lblDeutsch_1.insets = new Insets(0, 0, 5, 5);
		gbc_lblDeutsch_1.gridx = 1;
		gbc_lblDeutsch_1.gridy = 2;
		mainPanel.add(lblDeutsch_1, gbc_lblDeutsch_1);
		
		JLabel lblNewLabel = new JLabel("Mathematik");
		GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
		gbc_lblNewLabel.anchor = GridBagConstraints.NORTH;
		gbc_lblNewLabel.insets = new Insets(0, 0, 5, 5);
		gbc_lblNewLabel.gridx = 2;
		gbc_lblNewLabel.gridy = 2;
		mainPanel.add(lblNewLabel, gbc_lblNewLabel);
		
		JLabel lblFremdsprache = new JLabel("Fremdsprache");
		GridBagConstraints gbc_lblFremdsprache = new GridBagConstraints();
		gbc_lblFremdsprache.insets = new Insets(0, 0, 5, 5);
		gbc_lblFremdsprache.gridx = 3;
		gbc_lblFremdsprache.gridy = 2;
		mainPanel.add(lblFremdsprache, gbc_lblFremdsprache);
		
		JLabel lblKernfach_1 = new JLabel("Kernfach 4");
		GridBagConstraints gbc_lblKernfach_1 = new GridBagConstraints();
		gbc_lblKernfach_1.insets = new Insets(0, 0, 5, 5);
		gbc_lblKernfach_1.gridx = 4;
		gbc_lblKernfach_1.gridy = 2;
		mainPanel.add(lblKernfach_1, gbc_lblKernfach_1);
		
		JLabel lblKernfach = new JLabel("Kernfach 5");
		GridBagConstraints gbc_lblKernfach = new GridBagConstraints();
		gbc_lblKernfach.insets = new Insets(0, 0, 5, 0);
		gbc_lblKernfach.gridx = 5;
		gbc_lblKernfach.gridy = 2;
		mainPanel.add(lblKernfach, gbc_lblKernfach);
		
		textField = new JTextField();
		textField.setEditable(false);
		textField.setText("1");
		GridBagConstraints gbc_textField = new GridBagConstraints();
		gbc_textField.insets = new Insets(0, 0, 5, 5);
		gbc_textField.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField.gridx = 0;
		gbc_textField.gridy = 3;
		mainPanel.add(textField, gbc_textField);
		textField.setColumns(10);
		
		textField_1 = new JTextField();
		textField_1.setEditable(false);
		GridBagConstraints gbc_textField_1 = new GridBagConstraints();
		gbc_textField_1.insets = new Insets(0, 0, 5, 5);
		gbc_textField_1.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_1.gridx = 1;
		gbc_textField_1.gridy = 3;
		mainPanel.add(textField_1, gbc_textField_1);
		textField_1.setColumns(10);
		
		textField_2 = new JTextField();
		textField_2.setEditable(false);
		GridBagConstraints gbc_textField_2 = new GridBagConstraints();
		gbc_textField_2.insets = new Insets(0, 0, 5, 5);
		gbc_textField_2.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_2.gridx = 2;
		gbc_textField_2.gridy = 3;
		mainPanel.add(textField_2, gbc_textField_2);
		textField_2.setColumns(10);
		
		textField_3 = new JTextField();
		textField_3.setEditable(false);
		GridBagConstraints gbc_textField_3 = new GridBagConstraints();
		gbc_textField_3.insets = new Insets(0, 0, 5, 5);
		gbc_textField_3.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_3.gridx = 3;
		gbc_textField_3.gridy = 3;
		mainPanel.add(textField_3, gbc_textField_3);
		textField_3.setColumns(10);
		
		textField_4 = new JTextField();
		textField_4.setEditable(false);
		GridBagConstraints gbc_textField_4 = new GridBagConstraints();
		gbc_textField_4.insets = new Insets(0, 0, 5, 5);
		gbc_textField_4.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_4.gridx = 4;
		gbc_textField_4.gridy = 3;
		mainPanel.add(textField_4, gbc_textField_4);
		textField_4.setColumns(10);
		
		textField_5 = new JTextField();
		textField_5.setEditable(false);
		GridBagConstraints gbc_textField_5 = new GridBagConstraints();
		gbc_textField_5.insets = new Insets(0, 0, 5, 0);
		gbc_textField_5.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_5.gridx = 5;
		gbc_textField_5.gridy = 3;
		mainPanel.add(textField_5, gbc_textField_5);
		textField_5.setColumns(10);
		
		textField_6 = new JTextField();
		textField_6.setEditable(false);
		textField_6.setText("2");
		GridBagConstraints gbc_textField_6 = new GridBagConstraints();
		gbc_textField_6.insets = new Insets(0, 0, 5, 5);
		gbc_textField_6.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_6.gridx = 0;
		gbc_textField_6.gridy = 4;
		mainPanel.add(textField_6, gbc_textField_6);
		textField_6.setColumns(10);
		
		textField_7 = new JTextField();
		textField_7.setEditable(false);
		GridBagConstraints gbc_textField_7 = new GridBagConstraints();
		gbc_textField_7.insets = new Insets(0, 0, 5, 5);
		gbc_textField_7.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_7.gridx = 1;
		gbc_textField_7.gridy = 4;
		mainPanel.add(textField_7, gbc_textField_7);
		textField_7.setColumns(10);
		
		textField_8 = new JTextField();
		textField_8.setEditable(false);
		GridBagConstraints gbc_textField_8 = new GridBagConstraints();
		gbc_textField_8.insets = new Insets(0, 0, 5, 5);
		gbc_textField_8.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_8.gridx = 2;
		gbc_textField_8.gridy = 4;
		mainPanel.add(textField_8, gbc_textField_8);
		textField_8.setColumns(10);
		
		textField_9 = new JTextField();
		textField_9.setEditable(false);
		GridBagConstraints gbc_textField_9 = new GridBagConstraints();
		gbc_textField_9.insets = new Insets(0, 0, 5, 5);
		gbc_textField_9.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_9.gridx = 3;
		gbc_textField_9.gridy = 4;
		mainPanel.add(textField_9, gbc_textField_9);
		textField_9.setColumns(10);
		
		textField_10 = new JTextField();
		textField_10.setEditable(false);
		GridBagConstraints gbc_textField_10 = new GridBagConstraints();
		gbc_textField_10.insets = new Insets(0, 0, 5, 5);
		gbc_textField_10.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_10.gridx = 4;
		gbc_textField_10.gridy = 4;
		mainPanel.add(textField_10, gbc_textField_10);
		textField_10.setColumns(10);
		
		textField_11 = new JTextField();
		textField_11.setEditable(false);
		GridBagConstraints gbc_textField_11 = new GridBagConstraints();
		gbc_textField_11.insets = new Insets(0, 0, 5, 0);
		gbc_textField_11.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_11.gridx = 5;
		gbc_textField_11.gridy = 4;
		mainPanel.add(textField_11, gbc_textField_11);
		textField_11.setColumns(10);
		
		textField_12 = new JTextField();
		textField_12.setEditable(false);
		textField_12.setText("3");
		GridBagConstraints gbc_textField_12 = new GridBagConstraints();
		gbc_textField_12.insets = new Insets(0, 0, 5, 5);
		gbc_textField_12.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_12.gridx = 0;
		gbc_textField_12.gridy = 5;
		mainPanel.add(textField_12, gbc_textField_12);
		textField_12.setColumns(10);
		
		textField_13 = new JTextField();
		textField_13.setEditable(false);
		GridBagConstraints gbc_textField_13 = new GridBagConstraints();
		gbc_textField_13.insets = new Insets(0, 0, 5, 5);
		gbc_textField_13.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_13.gridx = 1;
		gbc_textField_13.gridy = 5;
		mainPanel.add(textField_13, gbc_textField_13);
		textField_13.setColumns(10);
		
		textField_14 = new JTextField();
		textField_14.setEditable(false);
		GridBagConstraints gbc_textField_14 = new GridBagConstraints();
		gbc_textField_14.insets = new Insets(0, 0, 5, 5);
		gbc_textField_14.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_14.gridx = 2;
		gbc_textField_14.gridy = 5;
		mainPanel.add(textField_14, gbc_textField_14);
		textField_14.setColumns(10);
		
		textField_15 = new JTextField();
		textField_15.setEditable(false);
		GridBagConstraints gbc_textField_15 = new GridBagConstraints();
		gbc_textField_15.insets = new Insets(0, 0, 5, 5);
		gbc_textField_15.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_15.gridx = 3;
		gbc_textField_15.gridy = 5;
		mainPanel.add(textField_15, gbc_textField_15);
		textField_15.setColumns(10);
		
		textField_16 = new JTextField();
		textField_16.setEditable(false);
		GridBagConstraints gbc_textField_16 = new GridBagConstraints();
		gbc_textField_16.insets = new Insets(0, 0, 5, 5);
		gbc_textField_16.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_16.gridx = 4;
		gbc_textField_16.gridy = 5;
		mainPanel.add(textField_16, gbc_textField_16);
		textField_16.setColumns(10);
		
		textField_17 = new JTextField();
		textField_17.setEditable(false);
		GridBagConstraints gbc_textField_17 = new GridBagConstraints();
		gbc_textField_17.insets = new Insets(0, 0, 5, 0);
		gbc_textField_17.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_17.gridx = 5;
		gbc_textField_17.gridy = 5;
		mainPanel.add(textField_17, gbc_textField_17);
		textField_17.setColumns(10);
		
		textField_18 = new JTextField();
		textField_18.setEditable(false);
		textField_18.setText("4");
		GridBagConstraints gbc_textField_18 = new GridBagConstraints();
		gbc_textField_18.insets = new Insets(0, 0, 5, 5);
		gbc_textField_18.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_18.gridx = 0;
		gbc_textField_18.gridy = 6;
		mainPanel.add(textField_18, gbc_textField_18);
		textField_18.setColumns(10);
		
		textField_19 = new JTextField();
		textField_19.setEditable(false);
		GridBagConstraints gbc_textField_19 = new GridBagConstraints();
		gbc_textField_19.insets = new Insets(0, 0, 5, 5);
		gbc_textField_19.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_19.gridx = 1;
		gbc_textField_19.gridy = 6;
		mainPanel.add(textField_19, gbc_textField_19);
		textField_19.setColumns(10);
		
		textField_20 = new JTextField();
		textField_20.setEditable(false);
		GridBagConstraints gbc_textField_20 = new GridBagConstraints();
		gbc_textField_20.insets = new Insets(0, 0, 5, 5);
		gbc_textField_20.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_20.gridx = 2;
		gbc_textField_20.gridy = 6;
		mainPanel.add(textField_20, gbc_textField_20);
		textField_20.setColumns(10);
		
		textField_21 = new JTextField();
		textField_21.setEditable(false);
		GridBagConstraints gbc_textField_21 = new GridBagConstraints();
		gbc_textField_21.insets = new Insets(0, 0, 5, 5);
		gbc_textField_21.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_21.gridx = 3;
		gbc_textField_21.gridy = 6;
		mainPanel.add(textField_21, gbc_textField_21);
		textField_21.setColumns(10);
		
		textField_22 = new JTextField();
		textField_22.setEditable(false);
		GridBagConstraints gbc_textField_22 = new GridBagConstraints();
		gbc_textField_22.insets = new Insets(0, 0, 5, 5);
		gbc_textField_22.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_22.gridx = 4;
		gbc_textField_22.gridy = 6;
		mainPanel.add(textField_22, gbc_textField_22);
		textField_22.setColumns(10);
		
		textField_23 = new JTextField();
		textField_23.setEditable(false);
		GridBagConstraints gbc_textField_23 = new GridBagConstraints();
		gbc_textField_23.insets = new Insets(0, 0, 5, 0);
		gbc_textField_23.fill = GridBagConstraints.HORIZONTAL;
		gbc_textField_23.gridx = 5;
		gbc_textField_23.gridy = 6;
		mainPanel.add(textField_23, gbc_textField_23);
		textField_23.setColumns(10);
		
		JLabel lblSumme = new JLabel("Summe");
		GridBagConstraints gbc_lblSumme = new GridBagConstraints();
		gbc_lblSumme.insets = new Insets(0, 0, 5, 5);
		gbc_lblSumme.gridx = 0;
		gbc_lblSumme.gridy = 7;
		mainPanel.add(lblSumme, gbc_lblSumme);
		
		JLabel lblSu = new JLabel("SU");
		GridBagConstraints gbc_lblSu = new GridBagConstraints();
		gbc_lblSu.insets = new Insets(0, 0, 5, 5);
		gbc_lblSu.gridx = 0;
		gbc_lblSu.gridy = 8;
		mainPanel.add(lblSu, gbc_lblSu);
		
		JLabel labelSumGerman = new JLabel("0.0");
		GridBagConstraints gbc_labelSumGerman = new GridBagConstraints();
		gbc_labelSumGerman.insets = new Insets(0, 0, 5, 5);
		gbc_labelSumGerman.gridx = 1;
		gbc_labelSumGerman.gridy = 8;
		mainPanel.add(labelSumGerman, gbc_labelSumGerman);
		
		label_1 = new JLabel("0.0");
		GridBagConstraints gbc_label_1 = new GridBagConstraints();
		gbc_label_1.insets = new Insets(0, 0, 5, 5);
		gbc_label_1.gridx = 2;
		gbc_label_1.gridy = 8;
		mainPanel.add(label_1, gbc_label_1);
		
		label_2 = new JLabel("0.0");
		GridBagConstraints gbc_label_2 = new GridBagConstraints();
		gbc_label_2.insets = new Insets(0, 0, 5, 5);
		gbc_label_2.gridx = 3;
		gbc_label_2.gridy = 8;
		mainPanel.add(label_2, gbc_label_2);
		
		label_3 = new JLabel("0.0");
		GridBagConstraints gbc_label_3 = new GridBagConstraints();
		gbc_label_3.insets = new Insets(0, 0, 5, 5);
		gbc_label_3.gridx = 4;
		gbc_label_3.gridy = 8;
		mainPanel.add(label_3, gbc_label_3);
		
		label_4 = new JLabel("0.0");
		GridBagConstraints gbc_label_4 = new GridBagConstraints();
		gbc_label_4.insets = new Insets(0, 0, 5, 0);
		gbc_label_4.gridx = 5;
		gbc_label_4.gridy = 8;
		mainPanel.add(label_4, gbc_label_4);
		
		lblDurchschnitt = new JLabel("Durchschnitt");
		GridBagConstraints gbc_lblDurchschnitt = new GridBagConstraints();
		gbc_lblDurchschnitt.insets = new Insets(0, 0, 5, 5);
		gbc_lblDurchschnitt.gridx = 0;
		gbc_lblDurchschnitt.gridy = 9;
		mainPanel.add(lblDurchschnitt, gbc_lblDurchschnitt);
		
		lblDs = new JLabel("DS");
		GridBagConstraints gbc_lblDs = new GridBagConstraints();
		gbc_lblDs.insets = new Insets(0, 0, 0, 5);
		gbc_lblDs.gridx = 0;
		gbc_lblDs.gridy = 10;
		mainPanel.add(lblDs, gbc_lblDs);
		
		labelAverageGerman = new JLabel("0.0");
		GridBagConstraints gbc_labelAverageGerman = new GridBagConstraints();
		gbc_labelAverageGerman.insets = new Insets(0, 0, 0, 5);
		gbc_labelAverageGerman.gridx = 1;
		gbc_labelAverageGerman.gridy = 10;
		mainPanel.add(labelAverageGerman, gbc_labelAverageGerman);
		
		label_6 = new JLabel("0.0");
		GridBagConstraints gbc_label_6 = new GridBagConstraints();
		gbc_label_6.insets = new Insets(0, 0, 0, 5);
		gbc_label_6.gridx = 2;
		gbc_label_6.gridy = 10;
		mainPanel.add(label_6, gbc_label_6);
		
		label_7 = new JLabel("0.0");
		GridBagConstraints gbc_label_7 = new GridBagConstraints();
		gbc_label_7.insets = new Insets(0, 0, 0, 5);
		gbc_label_7.gridx = 3;
		gbc_label_7.gridy = 10;
		mainPanel.add(label_7, gbc_label_7);
		
		label_8 = new JLabel("0.0");
		GridBagConstraints gbc_label_8 = new GridBagConstraints();
		gbc_label_8.insets = new Insets(0, 0, 0, 5);
		gbc_label_8.gridx = 4;
		gbc_label_8.gridy = 10;
		mainPanel.add(label_8, gbc_label_8);
		
		label_9 = new JLabel("0.0");
		GridBagConstraints gbc_label_9 = new GridBagConstraints();
		gbc_label_9.gridx = 5;
		gbc_label_9.gridy = 10;
		mainPanel.add(label_9, gbc_label_9);
		
		JPanel buttonsPanel = new JPanel();
		buttonsPanel.setBackground(Color.GRAY);
		contentPane.add(buttonsPanel, BorderLayout.SOUTH);
		GridBagLayout gbl_buttonsPanel = new GridBagLayout();
		gbl_buttonsPanel.columnWidths = new int[]{0, 0, 0, 0, 0};
		gbl_buttonsPanel.rowHeights = new int[]{0, 0};
		gbl_buttonsPanel.columnWeights = new double[]{1.0, 1.0, 1.0, 1.0, Double.MIN_VALUE};
		gbl_buttonsPanel.rowWeights = new double[]{1.0, Double.MIN_VALUE};
		buttonsPanel.setLayout(gbl_buttonsPanel);
		
		btnSpeichern = new JButton("Speichern");
		btnSpeichern.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String semester = txtSemester.getText();
				String german = txtGerman.getText();
				String maths = txtMaths.getText();
				String language = txtLanguage.getText();
				String mainSubject4 = txtMainSubject4.getText();
				String mainSubject5 = txtMainSubject5.getText();
				
				switch (semester) {
					case "1":
						textField_1.setText(german);
						textField_2.setText(maths);
						textField_3.setText(language);
						textField_4.setText(mainSubject4);
						textField_5.setText(mainSubject5);
						break;
					case "2":
						textField_7.setText(german);
						textField_8.setText(maths);
						textField_9.setText(language);
						textField_10.setText(mainSubject4);
						textField_11.setText(mainSubject5);
						break;
					case "3":
						textField_13.setText(german);
						textField_14.setText(maths);
						textField_15.setText(language);
						textField_16.setText(mainSubject4);
						textField_17.setText(mainSubject5);
						break;
					case "4":
						textField_19.setText(german);
						textField_20.setText(maths);
						textField_21.setText(language);
						textField_22.setText(mainSubject4);
						textField_23.setText(mainSubject5);
						break;
					default:
						System.out.println("Error");
				}
			}
		});
		btnSpeichern.setBackground(Color.WHITE);
		GridBagConstraints gbc_btnSpeichern = new GridBagConstraints();
		gbc_btnSpeichern.fill = GridBagConstraints.HORIZONTAL;
		gbc_btnSpeichern.insets = new Insets(0, 0, 0, 5);
		gbc_btnSpeichern.gridx = 0;
		gbc_btnSpeichern.gridy = 0;
		buttonsPanel.add(btnSpeichern, gbc_btnSpeichern);
		
		btnSummieren = new JButton("Summieren");
		btnSummieren.setBackground(Color.WHITE);
		btnSummieren.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int sumGerman = getSum(textField_1.getText(), textField_7.getText(), textField_13.getText(), textField_19.getText());
				labelSumGerman.setText(String.valueOf(sumGerman));
				
			}
		});
		GridBagConstraints gbc_btnSummieren = new GridBagConstraints();
		gbc_btnSummieren.fill = GridBagConstraints.HORIZONTAL;
		gbc_btnSummieren.insets = new Insets(0, 0, 0, 5);
		gbc_btnSummieren.gridx = 1;
		gbc_btnSummieren.gridy = 0;
		buttonsPanel.add(btnSummieren, gbc_btnSummieren);
		
		btnDurchschnitte = new JButton("Durchschnitte");
		btnDurchschnitte.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				double sumGerman = getSum(textField_1.getText(), textField_7.getText(), textField_13.getText(), textField_19.getText());
				double averageGerman = sumGerman / 4;
				labelAverageGerman.setText(String.valueOf(averageGerman));
			}
		});
		btnDurchschnitte.setBackground(Color.WHITE);
		GridBagConstraints gbc_btnDurchschnitte = new GridBagConstraints();
		gbc_btnDurchschnitte.fill = GridBagConstraints.HORIZONTAL;
		gbc_btnDurchschnitte.insets = new Insets(0, 0, 0, 5);
		gbc_btnDurchschnitte.gridx = 2;
		gbc_btnDurchschnitte.gridy = 0;
		buttonsPanel.add(btnDurchschnitte, gbc_btnDurchschnitte);
		
		btnBeenden = new JButton("Beenden");
		btnBeenden.setBackground(Color.WHITE);
		GridBagConstraints gbc_btnBeenden = new GridBagConstraints();
		gbc_btnBeenden.fill = GridBagConstraints.HORIZONTAL;
		gbc_btnBeenden.gridx = 3;
		gbc_btnBeenden.gridy = 0;
		buttonsPanel.add(btnBeenden, gbc_btnBeenden);
		
		panel_1 = new JPanel();
		panel_1.setBackground(Color.DARK_GRAY);
		contentPane.add(panel_1, BorderLayout.NORTH);
		
		lblNotenverwaltungOberstufe = new JLabel("Notenverwaltung Oberstufe");
		lblNotenverwaltungOberstufe.setForeground(Color.WHITE);
		panel_1.add(lblNotenverwaltungOberstufe);
	}
	
	private int getSum(String first, String second, String third, String fourth) {
		return parseIntOrNull(first) + parseIntOrNull(second) + parseIntOrNull(third) + parseIntOrNull(fourth);
	}
	
	private int parseIntOrNull(String number) {
		try {
			return Integer.parseInt(number);
		} catch (java.lang.NumberFormatException e) {
			return 0;
		}
	}

}