Are we happy enough ???

Worth Reading it !!!!!!!!!!!!

Yesterday, I was on the way back to home after work, and the FM radio went off for few seconds. I thought, I should have an iPod. Then suddenly I realized that I have not used my iPod in last 6 months. And then… more things, Handy cam in last 2 years, Digital Camera in last 2 months, DVD player in last 1 month and many more. Now I can say that I bought that Handy cam just out of impulse, I have used it twice only in last 4 years.

So, what’s wrong and where? When I look at myself or my friends I can see it everywhere. We are not happy with what we have but all are stressed and not happy for the things we don’t have. You have a Santro, but you want City… You have a City, but you want Skoda. Just after buying a new phone, we need another one. Better laptop, bigger TV, faster car, bigger house, more money… .I mean, these examples are endless. The point is, does it actually worth? Do we ever think if we actually need those things before we want them?

After this, I was forced to think what I need and what I don’t. May be I didn’t need this Handy cam or the iPod or that DVD player. When I see my father back at home. He has a simple BPL colour TV, he doesn’t need 32″ Sony LCD wall mount. He has a cell phone worth Rs 2,500. Whenever I ask him to change the phone, he always says… “Its a phone, I need this just for calls.” And believe me; he is much happier in life than me with those limited resources and simple gadgets. The very basic reason why he is happy with so little is that he doesn’t want things in life to make it luxurious, but he wants only those things which are making his life easier. It’s a very fine line between these two, but after looking my father’s life style closely, I got the point. He needs a cell phone but not the iPhone. He needs a TV but not the 32″ plasma. He needs a car but not an expensive one.

Initially I had lot of questions.

I am earning good, still I am not happy…...why ?

I have all luxuries, still I am stressed.... ....... why ?

I had a great weekend, still I am feeling tired...... why?

I met lot of people, I thought over it again and again, I still don’t know if I got the answers, but certainly figured out few things. I realize that one thing which is keeping me stressed is the “stay connected” syndrome. I realized that, at home also I am logged in on messengers, checking mails, using social networks, and on the top of that, the windows mobile is not letting me disconnected. On the weekend itself, trying to avoid unwanted calls… and that is keeping my mind always full of stress. I realized that I am spending far lesser money than what I earn, even then I am always worried about money and more money. I realized that I am saving enough money I would ever need, whenever needed. Still I am stressed about job and salary and spends.

May be, many people will call this approach “not progressive attitude”, but I want my life back. Ultimately it’s a single life, a day gone is a day gone. I believe if I am not happy tonight, I’ll never be happy tomorrow morning. I finally realized that meeting friends, spending quality time with your loved one’s; spending time with yourself is the most important thing. If on Sunday you are alone and you don’t have anybody to talk with, then all that luxuries life, all that money is wasted. May be cutting down your requirements, re-calculating your future goal in the light of today’s happiness is a worthwhile thing to do. May be selling off your Santro and buying Honda City on EMIs is not a good idea. I believe putting your happiness ahead of money is the choice we need to make.
I think, a lot can be said and done but what we need the most is re-evaluation of the value of happiness and time we are giving to our life and people associated with it.

Anyone interested in reading the latest features and enhancements in MS SQL Server 2008 R2 , please download the free e-book from

http://blogs.msdn.com/microsoft_press/archive/2010/04/14/free-ebook-introducing-microsoft-sql-server-2008-r2.aspx

Everything You Always Wanted to Know About HTML5

http://apirocks.com/html5/html5.html#slide1

The Java Memory Architecture

One of the biggest strength of the Java Platform is the implementation of an automatic memory management in the Java Virtual Maschine. Everybody who has programmed with languages like C/C++ knows about the problems of managing memory allocation and deallocation in the code. With Java problems like deallocating memory too early (corrupted pointer) or too late (memory leak) cannot occur by specification. The question is: Why am I writing these blog entries?


http://blog.codecentric.de/en/2010/01/java-outofmemoryerror-1-akt-das-java-memory-modell-stellt-sich-vor/

Java OutOfMemoryError

One day every professional Java programmer will suffer from this exception thrown by his Java application: java.lang.OutOfMemoryError.


http://blog.codecentric.de/en/2010/01/java-outofmemoryerror-eine-tragodie-in-sieben-akten/

Google Chat on Mobile Phone

Can we do a google chat , yahoo chat , and many more by using only GPRS ?....

we can say yes to the above question by looking into this Nimbuzz application...
step:1 open google in u r phone
step:2 type Nimbuzz and go for the search.
step:3 select u r mobile type like w810i..
step:4 get the jar Ex: director.jar
step:5 intsall and then start the application.

Check out for latest mobiles reviews and news

http://www.phonearena.com/htmls/home.php

Simply Singleton

Singleton Design Pattern: Ensure that only one instance of a class is created;
Provide a global point of access to the object.

public class SimpleSingleton {

private static SimpleSingleton instance = null;

protected SimpleSingleton() {

// Exists only to defeat instantiation.

}

public static SimpleSingleton getInstance() {

if (instance == null) {

instance = new SimpleSingleton();

}

return instance;

}

}

Take a look into the above class which is having a protected constructor and a public method getInstance().

There are several interesting points concerning the SimpleSingleton class. First, SimpleSingleton employs a technique known as lazy instantiation to create the singleton; as a result, the singleton instance is not created until the getInstance() method is called for the first time. This technique ensures that singleton instances are created only when needed.

Second, notice that SimpleSingleton implements a protected constructor so clients cannot instantiate SimpleSingleton instances; however, you may be surprised to discover that the following code is perfectly legal:

public class SimpleSingletontest extends TestCase {

public void testsing() {

SimpleSingleton instance = SimpleSingleton.getInstance();

SimpleSingleton anotherInstance = new SimpleSingleton();

Assert.assertEquals(true, instance == anotherInstance);

}

}

So, the first problem is lazy instantiation inorder to aviod that make few changes to SimpleSingleton...

public class SimpleSingleton {

private static SimpleSingleton instance = new SimpleSingleton();;

protected SimpleSingleton() {

// Exists only to defeat instantiation.

}

public static SimpleSingleton getInstance() {

return instance;

}

}

The second one is if we are declaring constructor as protected. There may be chanece of getting two objects. So we are violating the singleton pattern so make the constructor as private...

public class SimpleSingleton {

private static SimpleSingleton instance = new SimpleSingleton();;

private SimpleSingleton() {

// Exists only to defeat instantiation.

}

public static SimpleSingleton getInstance() {

return instance;

}

}

A third interesting point about SimpleSingleton , if SimpleSingleton implements the java.io.Serializable interface, the class's instances can be serialized and deserialized. However, if you serialize a singleton object and subsequently deserialize that object more than once, you will have multiple singleton instances

In order to avoid this the readResolve method should be implemented. See Serializable () and readResolve Method () in javadocs.

public class SimpleSingleton implements Serializable {
// This method is called immediately after an object of this class is deserialized.
// This method returns the singleton instance.
protected Object readResolve() {
return getInstance();
}
}

Note: The readResolve() method was added defaultly from java 1.5 (no need to write separately).

• Finally, and perhaps most important, Example 1's SimpleSingleton class is not thread-safe. If two threads—we'll call them Thread 1 and Thread 2—call SimpleSingleton.getInstance() at the same time, two SimpleSingleton instances can be created if Thread 1 is preempted just after it enters the if block and control is subsequently given to Thread 2

public class Singleton {

private static Singleton singleton = null;

private static boolean firstThread = true;

protected Singleton() {

// Exists only to defeat instantiation.

}

public static Singleton getInstance() {

System.out.println(" time "+ System.currentTimeMillis());

if (singleton == null) {

simulateRandomActivity();

singleton = new Singleton();

}

System.out.println("created singleton: " + singleton);

return singleton;

}

private static void simulateRandomActivity() {

try {

if (firstThread) {

firstThread = false;

System.out.println("sleeping...");

// This nap should give the second threadenough time

// to get by the first thread.

Thread.currentThread().sleep(1000);

}

} catch (InterruptedException ex) {

System.out.println("Sleep interrupted");

}

}

}

Following is the test class to test Singleton

import junit.framework.Assert;

import junit.framework.TestCase;

public class SingletonTest extends TestCase {

private static Singleton singleton = null;

public SingletonTest(String name) {

super(name);

}

public void setUp() {

singleton = null;

}

public void testUnique() throws InterruptedException {

// Both threads call Singleton.getInstance().

Thread threadOne = new Thread(new SingletonTestRunnable()),

threadTwo = new Thread(new SingletonTestRunnable());

threadOne.start();

threadTwo.start();

threadOne.join();

threadTwo.join();

}

private static class SingletonTestRunnable implements Runnable {

public void run() {

System.out.println("Thread started");

// Get a reference to the singleton.

Singleton s = Singleton.getInstance();

// Protect singleton member variable from multithreaded access.

synchronized(SingletonTest.class) {

if(singleton == null) // If local reference is null...

singleton = s; // ...set it to the singleton

}

// Local reference must be equal to the one and only instance of Singleton; otherwise, we have two

// Singleton instances.

System.out.println("Thread finished");

Assert.assertEquals(true, s == singleton);

}

}

}

If u test this output is:

Thread started

time 1272456665200

sleeping...

Thread started

time 1272456665200

created singleton: Singletonwithmultythreading.Singleton@471e30

Thread finished

created singleton: Singletonwithmultythreading.Singleton@10ef90c

Thread finished

junit.framework.AssertionFailedError: expected: but was:

at junit.framework.Assert.fail(Assert.java:47)

at junit.framework.Assert.failNotEquals(Assert.java:282)

at junit.framework.Assert.assertEquals(Assert.java:64)

at junit.framework.Assert.assertEquals(Assert.java:149)

at junit.framework.Assert.assertEquals(Assert.java:155)

at Singletonwithmultythreading.SingletonTest$SingletonTestRunnable.run(SingletonTest.java:38)

at java.lang.Thread.run(Thread.java:534)

so inorder to avoid that add the synchronized to the getInstance() method. So that it will hold the first object once the first object lefts the method second object can cal that method.

package Singletonwithmultythreading;

public class Singleton {

private static Singleton singleton = null;

private static boolean firstThread = true;

protected Singleton() {

// Exists only to defeat instantiation.

}

public synchronized static Singleton getInstance() {

System.out.println(" time "+ System.currentTimeMillis());

if (singleton == null) {

simulateRandomActivity();

singleton = new Singleton();

}

System.out.println("created singleton: " + singleton);

return singleton;

}

private static void simulateRandomActivity() {

try {

if (firstThread) {

firstThread = false;

System.out.println("sleeping...");

// This nap should give the second thread enough time

// to get by the first thread.

Thread.currentThread().sleep(1000);

}

} catch (InterruptedException ex) {

System.out.println("Sleep interrupted");

}

}

}

Now if you test it will pass all with green lights by junit...

Output:-

Thread started

Thread started

time 1272457018077

sleeping...

created singleton: Singletonwithmultythreading.Singleton@471e30

time 1272457019077

created singleton: Singletonwithmultythreading.Singleton@471e30

Thread finished

Thread finished

http://www.javaworld.com/javaworld/jw-04-2003/jw-0425-designpatterns.html#resources