new Task "Kreisumfang" to unsere kleine Tasks Frame added

src/main/java/src/TasksFrame.java

@@ -98,6 +98,8 @@ public class TasksFrame extends JFrame {
         setupRoundSum();
 
         setupExponent();
+        
+        setupKreisUmfang();
 
         setupUmrechnen();
 
@@ -108,6 +110,51 @@ public class TasksFrame extends JFrame {
 
     }
 
+    private void setupKreisUmfang() {
+
+        JPanel jPanel = setupPanel("Kreisumfang");
+
+        JButton button = new JButton("calculate");
+        button.setVisible(true);
+        button.setBounds(10, 65, 100, 30);
+        button.setBackground(Color.BLUE);
+
+        JTextField jTextField = new JTextField();
+        jTextField.setVisible(true);
+        jTextField.setBounds( 10, 40,  30, 20);
+        jTextField.setFont(new java.awt.Font("Arial", Font.BOLD, 12));
+
+
+
+        JLabel jLabel = new JLabel();
+        jLabel.setVisible(true);
+        jLabel.setBounds(10, 90, 60, 30);
+
+
+        jPanel.add(button);
+        jPanel.add(jTextField);
+        jPanel.add(jLabel);
+
+        button.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                String text = jTextField.getText();
+                Double val = Double.valueOf(text);
+                double res = Double.valueOf(kreisUmfang(val));
+                jLabel.setText(String.valueOf(res));
+            }
+        });
+    }
+
+    private double kreisUmfang(double radius) {
+
+        double result = 2 * Math.PI * radius;
+        double roundOff = Math.round(result * 100.0) / 100.0;
+        return roundOff;
+    }
+
+
+
     private void setupDurchschnitt() {
 
         JPanel jPanel = setupPanel("Durchschnitt");