Using threads to display the time.

[Arkie]

Code

GeSHi (java):
import java.text.SimpleDateFormat;
import java.util.Date;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
 
/*--------------------------------------------------------------------------
//Author List:
//   deAppel					<Creator>
//
//Description:
//	My demo that displays the current hour/seconds using a Thread.
//
//Environment:
//   This software was developed using Eclipse and Java 1.6
//
//Copyright Information:
//   Copyright (C) 2007      <Institution><None>
//		Ark de Appel 			www.engineeringserver.com
//
//----------------------------------------------------------------------*/
 
public class TimeTicker extends JFrame implements Runnable{
	JLabel timelbl;
 
	public TimeTicker(){
		//Container c = getContentPane();
		timelbl = new JLabel();
		add(timelbl);
		setSize(150,50);
		setResizable(false);
		setVisible(true);
	}
 
	public void run(){
		for(;;){
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			Date currentDate = new Date();
			SimpleDateFormat dateFormat = new SimpleDateFormat("h:mm:ss a");
			String d = dateFormat.format(currentDate);
			timelbl.setText("Current time " + d);
			this.setTitle("Time demo");
		}
	}	
 
	public static void main(String[] args){
		TimeTicker m = new TimeTicker();
		Thread t = new Thread(m);
		t.start();
	}
}
 
Created by GeSHI 1.0.7.20

Screenshot:

Using threads to display the time.

[deAppel]

Second version: added a button that stops and start the time.

Code

GeSHi (java):
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
 
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
 
/*--------------------------------------------------------------------------
//Author List:
//   deAppel					<Creator>
//
//Description:
//	My demo that displays the current hour/seconds using a Thread.
//
//Environment:
//   This software was developed using Eclipse and Java 1.6
//
//Copyright Information:
//   Copyright (C) 2007      <Institution><None>
//		Ark de Appel 			www.engineeringserver.com
//
//----------------------------------------------------------------------*/
 
public class TimeTicker extends JFrame implements ActionListener, Runnable{
	JLabel timelbl;
	static Thread t;
	JButton startStop;
	boolean stop = true;
 
	public TimeTicker(){
		Container c = getContentPane();
		c.setLayout(new FlowLayout());
		timelbl = new JLabel();
		startStop = new JButton("Stop clock");
		startStop.addActionListener(this);
		add(timelbl);
		add(startStop);
		setSize(200,100);
		//pack();
		setResizable(false);
		setVisible(true);
	}
 
	public void run(){
		for(;;){			
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}					
			Date currentDate = new Date();
			SimpleDateFormat dateFormat = new SimpleDateFormat("h:mm:ss a");
			String d = dateFormat.format(currentDate);
			timelbl.setText("Current time " + d);
			this.setTitle("Time demo");
		}
	}	
 
	public static void main(String[] args){
		TimeTicker m = new TimeTicker();
		t = new Thread(m);
		t.start();
	}
 
	public void actionPerformed(ActionEvent arg0) {
		if(stop){
 
				t.suspend();
 
			startStop.setText("Start clock");
			stop = false;
		}
		else{
			t.resume();
			startStop.setText("Stop clock");
			stop = true;
		}
 
	}
}
 
Created by GeSHI 1.0.7.20

[AdnanAhsan]

very nice, did you test this code? please guide me about Runnable() and simpledateformat..

[Arkie]

very nice, did you test this code? please guide me about Runnable() and simpledateformat..

Runnable()
public interface Runnable

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run.

This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. Being active simply means that a thread has been started and has not yet been stopped.

In addition, Runnable provides the means for a class to be active while not subclassing Thread. A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target. In most cases, the Runnable interface should be used if you are only planning to override the run() method and no other Thread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.

http://java.sun.com/j2se/...i/java/lang/Runnable.html

SimpleDateFormat:

Code

GeSHi (java):
Date currentDate = new Date();
			SimpleDateFormat dateFormat = new SimpleDateFormat("h:mm:ss a");
			String d = dateFormat.format(currentDate);
Created by GeSHI 1.0.7.20

Basically when you use SimpleDateFormat you first create a Date object and use the SimpleDateFormat to format your date as shown above.

Code

GeSHi (java):
String d = dateFormat.format(currentDate);
Created by GeSHI 1.0.7.20

This line will display the date as: 11:42:59 AM (Hour:Minutes:Seconds Am/pm marker)

For more info:
http://java.sun.com/j2se/...ext/SimpleDateFormat.html