Windows Probleme beim Erstellen von einer File, deshalb schlaegt Test fehl.

src/main/java/src/TasksFrame.java

@@ -6,6 +6,7 @@ import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.util.ArrayList;
+import java.util.LinkedList;
 
 public class TasksFrame extends JFrame {
 
@@ -72,6 +73,68 @@ public class TasksFrame extends JFrame {
 
         setupLeibnizR(1000);
 
+        setupEulerschePhiFunk();
+
+    }
+
+    private void setupEulerschePhiFunk() {
+
+        JPanel jPanel = setupPanel("Eulersche Phi Funktion");
+
+        Button button = new Button("Calc Phi");
+        button.setVisible(true);
+        button.setBounds(120, 50, 100,  30);
+
+        JTextField jTextField = new JTextField();
+        jTextField.setVisible(true);
+        jTextField.setBounds( 10, 40,  60, 20);
+
+        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) {
+                int r = ePhi(Integer.valueOf(jTextField.getText()));
+                jLabel.setText(String.valueOf(r));
+            }
+        });
+
+
+    }
+
+    private int ePhi(Integer n) {
+
+        LinkedList<Object> menge = new LinkedList<>();
+
+        for(int k =1; k<=n; k++){
+            if(ggt(k, n)== 1){
+                menge.add(k);
+            }
+        }
+        return menge.size();
+    }
+
+    private int ggt(int a, int b) {
+
+        int h;
+        if (a == 0) return 0;
+        if (b == 0) return 0;
+
+        do {
+            h = a % b;
+            a = b;
+            b = h;
+        } while (b != 0);
+
+        return a;
+
     }
 
     private void setupHelloWorld() {