Uhr

import java.awt.*;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class Digitaluhr extends JFrame implements Runnable {

        private static final long serialVersionUID = 1L;


        private Date date;

        private Font font = new Font("Verdana", Font.PLAIN, 20);

        private Thread thread;

        private JLabel label = null;






        public Digitaluhr(){


            setTitle("UHR");
            setAlwaysOnTop(true);
            setLocationRelativeTo(null);
            setLayout(new FlowLayout());
            setVisible(true);
            pack();
            add(getLabel());
            setSize(350, 60);
            getContentPane().setBackground(Color.DARK_GRAY);
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setVisible(true);
        }



        public JLabel getLabel() {
            if (label==null){
                label = new JLabel();
                label.setFont(font);
                this.add(label);
                label.setForeground(Color.WHITE);
                start();

            }
            return label;
        }

        private void gibDate() {
            label.setText(date.toString());
        }

        public void start() {
            if (thread == null) {
                thread = new Thread(this);
                thread.start();
            }
        }

        public void run() {

            while (true) {
                date = new Date();
                gibDate();
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        public static void main(String[] args) {
          Digitaluhr gui = new Digitaluhr();
        }
    }