Saturday, October 3, 2009
Hope you meditated enough.
It's been quite some time since my last post.
I had been really busy organizing the Intra Virtuoso events for my college juniors. Anyway getting back to the post, we shall continue from where we left...
No preprocessor directives in Java
Which means that, Java uses something else to makeup!
It uses a technique which we would be calling as...
Importing of Classes
Consider the following code in C
# include <stdio.h>
void main()
{
printf("Hi");
}
It actually has only four lines of code.
But at compile time it shows that there are 312 lines of code!
The remaining 308 lines of code is from the stdio.h header file. Its added into the program.
In C, its just the standard library functions from the header files.
Java has a different hierarchy for programming!
Java Library------->Packages------->Classes & Interfaces------->Methods
So, if a programmer wants to use a class then only that class imported.
Difference between #include and import
#include directive makes the compiler to go to the c/c++ standard library and then copy from the header files into the program.
import statement makes the JVM go to the java standard library, execute the code there and then substitute the result in the program.
Here no code is copied and hence there is no waste of memory or the process time.
Eg:
import java.lang.system;
import java.lang.string;
Note:
java.lang.*;
is automatically imported to all java programs!
So the code import java.lang.*;
is never needed!
Now the comparison between C and Java is over!
We shall try to get along with Java basics from now on.
Try to recollect the Hello world program in Java.
I would try to get back to you with my next post.
Monday, September 21, 2009
The driver, a man dressed in an Armani suit, Cerutti shoes, Ray-Ban sunglasses, TAG-Heuer wrist-watch, and a Pierre Cardin tie, gets out and asks the Shepherd: If I can tell you how many sheep you have, will you give me one of them?"
The shepherd looks at the young man, and then looks at the large flock of
grazing sheep and replies: "Okay."
The young man parks the car, connects his laptop to the mobile-fax, enters a NASA Webster, scans the ground using his GPS, opens a database and 60 Excel tables filled with logarithms and pivot tables, then prints out a 150 page report on his high-tech mini-printer.
He turns to the shepherd and says, "You have exactly 1,586 sheep here."
The shepherd cheers,"that's correct, you can have your sheep."
The young man makes his pick and puts it in the back of his Porsche.
The shepherd looks at him and asks: "If I guess your profession, will you return my animal to me?"
The young man answers, "Yes, why not".
The shepherd says, "You are an IT consultant ".
"How did you know?" asks the young man.
"Very simple," answers the shepherd. "First, you came here without being called. Second, you charged me a fee to tell me something I already knew, and third, you don't understand anything about my business...
Now can I have my DOG back?"
I got this story as a forwarded mail, few days back. It was like damaging myself because I aspire to become an IT consultant! Anyway, its how the customer always thinks of us! So it was pretty cool to read. Hope you like it too!
Sunday, September 13, 2009
1. Coca-Cola was originally green.
2. The most common name in the world is Mohammed.
3.The name of all the continents end with the same letter that they start with.
4. The strongest muscle in the body is the tongue.
5. There are two credit cards for every person in the United States.
6. TYPEWRITER is the longest word that can be made using the letters only on one row of the keyboard.
7. Women blink nearly twice as much as men!
8. You can't kill yourself by holding your breath.
9. It is impossible to lick your elbow.
10. People say "Bless you" when you sneeze because when you sneeze,your heart stops for a millisecond.
11. It is physically impossible for pigs to look up into the sky.
12. The "sixth sick sheik's sixth sheep's sick" is said to be the toughest tongue twister in the English language.
13. If you sneeze too hard, you can fracture a rib. If you try to suppress a sneeze, you can rupture a blood vessel in your head or neck and die.
14. Each king in a deck of playing cards represents great king from history.
Spades - King David
Clubs - Alexander the Great,
Hearts - Charlemagne
Diamonds - Julius Caesar.
15. 111,111,111 x 111,111,111 = 12,345,678,987,654,321
16. If a statue of a person in the park on a horse has both front legs in the air, the person died in battle.
If the horse has one front leg in the air,the person died as a result of wounds received in battle.
If the horse has a all four legs on the ground, the person died of natural causes.
17. What do bullet proof vests, fire escapes, windshield wipers and laser printers all have in common?
Ans. - All invented by women.
18. Question - This is the only food that doesn't spoil. What is this?
Ans. - Honey
19. A crocodile cannot stick its tongue out.
20. A snail can sleep for three years.
21.. All polar bears are left handed.
22. American Airlines saved $40,000 in 1987 by eliminating one olive from each salad served in first-class.
23. Butterflies taste with their feet.
24. Elephants are the only animals that can't jump.
25. In the last 4000 years, no new animals have been domesticated.
26. On average, people fear spiders more than they do death.
27. Shakespeare invented the word 'assassination' and 'bump'.
28. Stewardesses is the longest word typed with only the left hand.
29. The ant always falls over on its right side when intoxicated..
30. The electric chair was invented by a dentist.
31. The human heart creates enough pressure when it pumps out to the body to squirt blood 30 feet.
32. Rats multiply so quickly that in 18 months, two rats could have over million descendants.
33. Wearing headphones for just an hour will increase the bacteria in your ear by 700 times.
34. The cigarette lighter was invented before the match.
35. Most lipstick contains fish scales.
36. Like fingerprints, everyone's tongue print is different
Tuesday, September 8, 2009
Recently, I had to send a mail to all my friends.
So I was searching for a method to do it.
That's when I found this pretty useful video in youtube!
Monday, September 7, 2009
That's when this idea struck me. If you have a number, say x.
It shall be represented as (9*n)+y.
If we identify y then that's the sum of digits.
Say the number is 103
It's simple 99+4, (9*11)+4 hence 4.
y is nothing but (9+9+9+9....11 times) +4
So we skip all those nines and take the 4 alone.
In simpler words if x is the number then (x modulus 9) is the sum of the digits.
So in a programmer's perspective its just x%9.
Sunday, September 6, 2009
What Java does not have?
No functions in Java (Only Methods)
Function vs. Method
1. C++ functions could be present inside and outside the class.
2. But java methods could be written inside classes only.
No pointers in Java
1. Pointers lead to confusion.
2. Pointers crash program easily. (Addition of 2 pointers, Runtime memory leakage-dangling pointers)
3. Pointers break security.
No operator overloading in Java
1. Operators are immutable in java.
2. Operator’s meaning cannot be changed in java.
No preprocessor directives in Java
No multiple inheritance in Java
No static memory in Java
No destructors in Java
No goto statement in Java
Well, there seems to be more features available in C and C++ than in java. Why learn Java then? Doesn’t your brain ask this question? My brain did ask.
And I began searching for the answer.
First we have to compare C and Java to understand how the languages work.
Here is a small comparison between C and Java
C vs. Java
C
Java
So Java is powerful mainly because, of the byte code. It could be interpreted by the Java Virtual Machine. So based on the system, different JVMs are used. But the class file remains the same unlike C's exe file. It’s quite an interesting fact that JVM was written using C.
There is a big table with all the differences between C and Java mentioned in it. I would suggest you to skip it if you feel it to be too big.
Click here to view that table.
C uses a compiler or an interpreter (only one at a time).
Java uses both compiler and interpreter together.
In addition to this it uses a pretty interesting JIT. Now what does this JIT do?
Wikipedia gives the following definition:
In computing, just-in-time compilation (JIT), also known as dynamic translation, is a technique for improving the runtime performance of a computer program. JIT builds upon two earlier ideas in run-time environments: byte code compilation and dynamic compilation. It converts code at runtime prior to executing it natively, for example byte code into native machine code. The performance improvement over interpreters originates from caching the results of translating blocks of code, and not simply reevaluating each line or operand each time it is met. It also has advantages over statically compiling the code at development time, as it can recompile the code if this is found to be advantageous, and may be able to enforce security guarantees. Thus JIT can combine some of the advantages of interpretation and static (ahead-of-time) compilation.
The paragraph does not make complete sense to you unless you already know about JIT ;-).
Now let me try to put it simple.
Consider the following code:
for(i=1;i<=10;i++)
print i
It is a program to print from one to ten.
Normally, a compiler will convert the print i code ten times (say it takes ten
nanoseconds).
JIT Compiler will load print i at a place in the memory with an increment in it
and call it ten times (it takes just 2 nanoseconds).
Convert print I --------> 1 nanosecond.
Load it in memory -----> 1 nanosecond.
I have told you what Java does not have?
Why Java does not have those features is the question you have to think upon. Keep meditating till the next post.
I had been spending my last fortnight with Java. As I was studying, I understood its power and the flexibility it gives to a programmer. Though I have learnt Java in bits and pieces, I have not learnt it from the basic (ie., from the origin, history, architecture,..). In my college, we students have not been attending the classes for the past one week due to the fear of getting infected from swine flu in the campus! This has been like a blessing in disguise, I was able to peacefully explore Java. As I was exploring Java, I got an idea of making a small tutorial for people like me who have learnt Java in bits and pieces.
I will be posting my tutorial here in my blog once in a while! It is a tedious process so there is no fixed timeline on my tutorial posts. Continue your support.
Friday, September 4, 2009
Following are few photoshop works I liked.
A baby playing his own trick to the mum
Young at heart(s)-Shadow acts as the mind reader
A lady in a faded gray dress and her husband, dressed in a homespun suit walked in timidly without an appointment into the Harvard University President's outer office. The secretary could tell in a moment that such backwoods, country hicks had no business at Harvard and probably didn't even deserve to be in Harvard.
"We want to see the President "the man said softly.
"He'll be busy all day "the secretary snapped.
"We'll wait" the lady replied.
For hours the secretary ignored them, hoping that the couple would finally become discouraged and go away. They didn't and the secretary grew frustrated and finally decided to disturb the president.
"Maybe if you see them for a few minutes, they'll leave" she said to him. The President, stern faced and with dignity, strutted toward the couple.
The lady told him "We had a son who attended Harvard for one year. He loved Harvard. He was happy here. But about a year ago, he was accidentally killed. My husband and I would like to erect a memorial to him, somewhere on campus."
The president wasn't touched....He was shocked. "Madam" he said, gruffly, “We can't put up a statue for every person who attended Harvard and died. If we did, this place would look like a cemetery."
"Oh, no" the lady explained quickly "We don't want to erect a statue. We thought we would like to give a building to Harvard."
The president rolled his eyes. He glanced at the gingham dress and homespun suit, and then exclaimed, "A building! Do you have any earthly idea how much a building costs? We have over seven and a half million dollars in the physical buildings here at Harvard."
For a moment the lady was silent. The president was pleased. Maybe he could get rid of them now. The lady turned to her husband and said quietly, "Is that all it costs to start a university? Why don't we just start our own?"
Her husband nodded. The president's face wilted in confusion and bewilderment. Mr. and Mrs. Leland Stanford got up and walked away, traveling to Palo Alto, California where they established the University that bears their name. Stanford University, a memorial to a son that Harvard no longer cared about.
Most of the time we judge people by their outer appearance, which can be misleading. And in this impression, we tend to treat people badly by thinking they can do nothing for us. Thus we tend to lose our potential good friends, employees or customers.
Remember
In our Life, we seldom get people with whom we want to share & grow our thought process. But because of our inner EGO we miss them forever.
It is you who have to decide with whom you are getting associated in your life.
