SimpleCodeStuffs| Sandya Sampath

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Scheduling a time delay in Java

A simple timer schedule can be used to create a time delay in your java program. You can make use of the class Timer from java.util package. Timer is capable of scheduling an initial time delay after which the task starts executing AND the time gap for the consecutive execution of the same tasks.

The syntax for the time schedule can be understood as

timer.schedule(<task>,<initialTimeGap>,<consecutiveTimeGaps>);

Note : The time gaps are in milli Seconds

Below is a simple java program that makes use of timer to schedule an initial and consecutive time delays for a particular task.

package com.simpleCodeStuffs.timer;

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

public class TimerWithInitialDelay {
public static void main(String args[]){
	 Timer timer = new Timer();
	 int initialDelay=5;
	 int consecutiveDelays=2;
	 final Calendar cal=Calendar.getInstance();
	 System.out.println("SimpleCodeStuffs!!! START "+cal.getTime()+"\n");
	 
     timer.schedule(new TimerTask() {
          public void run() {
        	  Calendar currentTime=Calendar.getInstance();
        	  System.out.println("SimpleCodeStuffs!!! TASK   "+currentTime.getTime());
              }
          }, (initialDelay*1000), consecutiveDelays * 1000);
}
}

On running this program, the output appears as :-

timer delay

Notice in the output that, there is a time gap of 5 seconds from the commencement of the program to the execution of the task. After the initial execution, there is a time gap of 2 seconds between every consecutive execution of the tasks.

Download It -TimerSchedule

Spring Tutorial

Posted by Sandya Sampath in Spring, Spring Tutorial

The Spring Framework is a lightweight framework for developing Java enterprise applications. It provides high performing, easily testable and reusable code. Spring handles the infrastructure as the underlying framework so that you can focus on your application.Spring is modular in design, thereby making creation, handling and linking of individual components so much easier. Spring implements Model View Container(MVC) design pattern.

In this tutorial, we’ll take you step by step towards mastering the spring concepts.
Here you go!!!! :)

Spring Basics

1. Spring framework architecture

Gives you an insight of the architectural framework of Spring.

2. Basic concepts of Spring

This link provides any beginner, a start up at the basic concepts of Spring.

3. Inversion Of Control(IOC)

The IOC container is at the core of Spring framework. Read on to understand why this was needed and how it functions.

Basic tutorials with spring

1. Spring set up
Eclipse IDE set up and start up configurations for Spring support.

2. First hands-on with spring

Your first attempt at creating and running spring program at its simplest.

3. JavaConfig to provide Spring metadata

The configuration metadata can also be provided using a JavaConfig file. Click on to see more.

Dependency Injection(DI)

1. Dependency Injection(DI) in spring

What exactly is Dependency Injection and why is it needed? What are the types of DI supported by Spring.

2. Basic example of Setter injection in spring
Basic example of setting values to attributes (of primitive Data Types to a class through the bean using setter injection

3. Basic example of Constructor injection in spring
Basic example of setting values to attributes (of primitive Data Types to a class through the bean using constructor injection

4. Setter injection for reference bean

How setter injection is done when an attribute of a class is another class.

5. Constructor injection for reference bean

How constructor injection is done when an attribute of a class is another class.

6. Constructor injection – ambiguities

Ambiguities that might arise while passing values to constructor parameters through injection.