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ClockPanel.java

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package part4.digitalclock;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Calendar;

import javax.swing.JPanel;

@SuppressWarnings("WeakerAccess")

public class ClockPanel extends JPanel {

public ClockPanel() {

super();

setBackground(Color.BLACK);

new PeriodicThread(1000, ev -> repaint()).start();

}

@Override

public void paintComponent(Graphics g) {

super.paintComponent(g);

final Calendar calendar = Calendar.getInstance();

final int hour = calendar.get(Calendar.HOUR);

final int minute = calendar.get(Calendar.MINUTE);

final int second = calendar.get(Calendar.SECOND);

String sb = String.format("%02d", hour) + ":" +

String.format("%02d", minute) + ":" + String.format("%02d", second);

g.setColor(Color.GREEN);

g.setFont(new Font("Times New Roman", Font.PLAIN, 56));

g.drawString(sb, 100, 50);

}

}