Add clock application

clock/src/main/java/fr/uha/gasser/clock/Clock.java

@@ -0,0 +1,44 @@
+package fr.uha.gasser.clock;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.text.DateFormat;
+import java.util.Date;
+
+public class Clock extends JFrame {
+
+    private final JTextField timeField;
+
+    private Clock() {
+        super("Clock example");
+
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        timeField = new JTextField();
+        timeField.setColumns(10);
+        timeField.setEditable(false);
+
+        getContentPane().add(timeField);
+
+        ActionListener timerTask = new ActionListener() {
+            private DateFormat df = DateFormat.getTimeInstance(DateFormat.MEDIUM);
+
+            @Override
+            public void actionPerformed(ActionEvent actionEvent) {
+                timeField.setText(df.format(new Date()));
+            }
+        };
+
+        pack();
+        setVisible(true);
+
+        Timer timer = new Timer(500, timerTask);
+        timer.start();
+    }
+
+    public static void main(String[] args) {
+        // La création de l’interface est confié au DTE
+        EventQueue.invokeLater(Clock::new);
+    }
+}