[Java Code Sample] Create timer (normal/countdown/two digits)

 

Here's a sample code to create various timers.

In this code, we make three kinds of timer.

1. Simple timer

2. Normal timer (Like stopwatch)

3. Countdown timer 

Please check my video tutorial if you want to follow the process step by step:

Here's the code:

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;

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

public class Main {
	
	JFrame window;
	JLabel counterLabel;
	Font font1 = new Font("Arial", Font.PLAIN, 70);	
	Timer timer;	
	int second, minute;
	String ddSecond, ddMinute;	
	DecimalFormat dFormat = new DecimalFormat("00");
	

	public static void main(String[] args) {
		
		new Main();		
	}
	
	public Main() {
		
		window = new JFrame();
		window.setSize(800,600);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.setLayout(null);
		
		counterLabel = new JLabel("");
		counterLabel.setBounds(300, 230, 200, 100);
		counterLabel.setHorizontalAlignment(JLabel.CENTER);
		counterLabel.setFont(font1);
		
		window.add(counterLabel);
		window.setVisible(true);
		
// Enable this to use Simple Timer
//		second = 0;
//		simpleTimer();
//		timer.start();
		
// Enable this to use Normal Timer
//		counterLabel.setText("00:00");
//		second =0;
//		minute =0;
//		normalTimer();
//		timer.start();
		
		// Countdown Timer
		counterLabel.setText("03:00");
		second =0;
		minute =3;
		countdownTimer();
		timer.start();						
	}
    
// Enable this to use Simple Timer
//	public void simpleTimer() {
//		
//		timer = new Timer(1000, new ActionListener() {
//			
//			@Override
//			public void actionPerformed(ActionEvent e) {
//				
//				second++;
//				
//				counterLabel.setText(""+ second);
//			}
//		});
//	}
	
// Enable this to use Normal Timer
//	public void normalTimer() {
//		
//		timer = new Timer(1000, new ActionListener() {
//			
//			@Override
//			public void actionPerformed(ActionEvent e) {
//				
//				second++;
//				
//				ddSecond = dFormat.format(second);
//				ddMinute = dFormat.format(minute);				
//				counterLabel.setText(ddMinute + ":" + ddSecond);
//				
//				if(second==60) {
//					second=0;
//					minute++;
//					
//					ddSecond = dFormat.format(second);
//					ddMinute = dFormat.format(minute);
//					counterLabel.setText(ddMinute + ":" + ddSecond);
//				}
//			}
//		});
//	}
	public void countdownTimer() {
		
		timer = new Timer(1000, new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				
				second--;
				ddSecond = dFormat.format(second);
				ddMinute = dFormat.format(minute);	
				counterLabel.setText(ddMinute + ":" + ddSecond);
				
				if(second==-1) {
					second = 59;
					minute--;
					ddSecond = dFormat.format(second);
					ddMinute = dFormat.format(minute);	
					counterLabel.setText(ddMinute + ":" + ddSecond);
				}
				if(minute==0 && second==0) {
					timer.stop();
				}
			}
		});		
	}		
}

Result: