The final keyword in java is used to restrict the user. The final keyword can be used in many context. Final can be:
final keyword in java :: futureX

  • variable
  • method
  • class


Final variable :
If you make any variable as final, you cannot change the value of final variable(It will be constant).

//can't assign a value to final variable class Simple{ final int a=50; void change(){ a=100; //CTE } public static void main(String args[]){ Simple S=new Simple(); S.change(); System.out.println(S.a); } }

Final method :
If you make any method as final, you cannot override it.

//overriden method is final CTE class A{ final void m(){System.out.println("hello");} } class Simple extends A{ void m(){System.out.println("java");} public static void main(String args[]){ Simple S=new Simple(); S.m(); } }

Final class :
If you make any class as final, you cannot inherit it.

//cant inherit from final class CTE final class A{} class Simple extends A{ public static void main(String args[]) {} }
super is a reference variable that is used to refer immediate parent class object.

Uses of super Keyword:

  • super is used to refer immediate parent class instance variable.
  • super() is used to invoke immediate parent class constructor.
  • super is used to invoke immediate parent class method.
1.super is used to refer immediate parent class instance variable.

Problem without super keyword

class Vehicle{ int speed=50; } class Bike extends Vehicle{ int speed=100; void display(){ System.out.println(speed);//will print speed of Bike } public static void main(String args[]){ Bike b=new Bike(); b.display(); } }

In the above example Vehicle and Bike both class have a common property speed. Instance variable of current class is refered by instance bydefault, but I have to refer parent class instance variable that is why we use super keyword to distinguish between parent class instance variable and current class instance variable.

Solution by super keyword

class Vehicle{ int speed=50; } class Bike extends Vehicle{ int speed=100; void display(){ System.out.println(super.speed);//will print speed of Vehicle now } public static void main(String args[]){ Bike b=new Bike(); b.display(); } }

 2.super is used to invoke parent class constructor.

class Vehicle{ Vehicle(){System.out.println("Vehicle is created");} } class Bike extends Vehicle{ Bike(){ super();//will invoke parent class constructor System.out.println("Bike is created"); } public static void main(String args[]){ Bike b=new Bike(); } }

 3. super can be used to invoke immediate parent class method.

class Person{ void message(){System.out.println("welcome");} } class Student extends Person{ void message(){System.out.println("welcome to java");} void dislay(){ message();//will invoke current class message() method super.message();//will invoke parent class message() method } public static void main(String args[]){ Student s=new Student(); s.display(); } }

 JAVA TUTORIALS HOMEPAGE
Pulmon is a great application which brings Windows 8 like Metro UI Widgets in Windows 7. It gives you various options to add as tiles such as Mozilla Aurora, Storage etc. Mozilla Aurora widget adds a beautiful tile on desktop. Clicking on it will open Aurora. 


Updates in Pulmon 2.0:
1)Splash Screen has been added to Pulmon. Now Pulmon will start with a metro splash screen
2)Changed Background – Background color of Pulmon has been changed to the metro color “Dodger Blue”
3)They worked on Pulmon 2.0 a lot and fixed some issues
4)Metro UI Colors –  tried their best to select master Metro UI colors for tiles. Now tiles have Metro UI colors
5)Improved Stability – In the previous release, Microsoft Office Suite Tile and BUILD Tile were unstable. But now they are stable and can be used as you use other tiles
6)It have added a “Get Involved!” button in Pulmon to directly involve in Pulmon Project. By pressing this button, Pulmon will open the default E-mail client. You, then, can send us a mail about involvation
7)The sizes of tiles have been decreased to increase flexibility for the users
8)It have implented Windows 8 style tiles e.g. Internet Explorer, Control Panel and BUILD tiles
9)Now the default background is of Windows 8 default start screen background
10)You will get a Metro Menu in fullscreen mode. Just click on User Avatar and see the action. It offers to restart and shutdown the computer and it also offers to change user avatar
11)Storage tile has been updated and now you can select any drive by using Storage Options in right click menu
“12)Zuro” tile is a new tile for Pulmon. It opens Zuro (A web browser based on Metro UI and Immersive UI) when a user double-click on it
13)“Desktop” tile shows the current desktop background
14)Added error handling code for the exceptions
15)“Mozilla Firefox” tile is now “Mozilla Aurora” tile. Works only with Mozilla’s Aurora Channel
16)They have updated Shutdown Manager tile and System Information tile. They were looking ugly but now they are looking very good with a brand new look.
17)It just fixed some tool-tip issues
18)It applied Metro UI on Storage Settings and Zuro Settings.

Note: Below are mentioned only few widgets. The newest version has more widgets than the described below. 

Widgets: 
User- Clicking “User” tile will open a User Widget. If you want to open User Accounts, double-click on the green place of tile or double-click on User Avatar. There are many tweaks available for user tile. Right click on the tile and click options. You can choose “Take User Avatar from Windows System” or choose custom avatar.
Control Panel- Clicking Control Panel tile will load control panel widget. You can open Control Panel by clicking on its tile. Its currently not more than a tile. It will get some features in next versions.
Clock- Pulmon will provide you a very cool widget “Clock”. It will show you time, month and day of the week. Some new tweaks will be provided to you in the next versions
Shutdown Manager- It’s a very easy to use widget which will allows you to control over you pc with one click.Shutdown,Restart, Log Off and Hibernate’s Options are given. Please note that  some of the features are not working.
Webby- Webby is another good widget which provides you quick access to tech sites like The Windows Club, IntoWindows,WinMatrix, AskVG etc.. 

How to Use:

1.Download and Run the application
2.You will see two groups “Add Tiles” and “Remove Tiles”
3.Click a tile in Add Tiles group e.g Control Panel Tile
4.It will load Control Panel tile and the icon of Control Panel will be disappeared from “Add Tiles” group and start appearing in “Remove Tiles” group
5.Click the Control Panel tile in Remove Tiles group will remove it  
,
Inheritance is a mechanism in which one object acquires all the properties and behaviour of another object. The idea behind inheritance is that you can create new classes that are built upon existing classes. When you inherit from an existing class, you reuse (or inherit) methods and fields, and you add new methods and fields to adapt your new class to new situations.Inheritance represents the IS-A relationship.



Why use Inheritance?

  • for method overriding
  • for code reusability
Syntax of Inheritance

class Subclass-name  extends Superclass-name
{
//methods and fields
}


The keyword extends indicates that you are making a new class that derives from an existing class.
In the terminology of Java, a class that is inherited is called a superclass. The new class is called a subclass.

types of inheritance:
















 example of single level inheritance :
class Animal{
void eat(){System.out.println("eating food");}
}


class Dog extends Animal{

void bark(){System.out.println("barking");}

public static void main(String args[]){

Dog d=new Dog();
d.bark();
d.eat();

}
}



Que) Why multiple inheritance is not supported in java?   To reduce the complexity and simplify the language,multiple inheritance is not supported in java.


                            JAVA TUTORIALS HOMEPAGE

Behold, the iPhone 5 is here.

 Apple Inc. today announced its new iPhone, as well as changes to its iPod line and iTunes software, at a press event in San Francisco.

 In short, the "world's thinnest smartphone" is a whole new phone, matching many of the rumors that had been floating around about its introduction for months.

 "We have updated every aspect of iPhone 5," said Phil Schiller, Apple's senior vice president of worldwide marketing. "The challenge is to make it better and smaller."
Features :
The iPhone 5 is lighter and faster -- though also taller -- than any of Apple's previous smartphones. It has a 4-inch screen with an 1136x640 resolution Retina display. It is 7.6 mm thick and weighs in at 112 grams. That's a half-inch bigger, 18 percent thinner, and 20 percent lighter than the iPhone 4S.

Apple said the iPhone 5 has a fifth row of icons on its screen, which features 44 percent more color saturation. A more powerful A6 processor will make the new phone twice as fast as the iPhone 4S. It also has a bumped-up audio system and an upgraded iSight camera. While it remains an 8-megapixel camera, the same as what you find in the iPhone 4S, the iPhone 5's camera will have new better low-light capabilities and a panorama mode, Apple said.



The iPhone 5's battery will "exceed battery life of the iPhone 4s," Schieller said, with eight hours' talk time and 225 hours on standby.

Available in slate and black, or silver and white, the iPhone 5 is made out of glass and alumnium. The back of the phone is all metal -- a change from the iPhone 4S, which had a glass back that, users complained, shattered easily. The phone also comes with a new, smaller cable connector, called Lightning, which is designed to work with more iPhone accessory makers. An adapter will be available for users with older Apple hardware.

Prices :
What will this cost? Apple said the iPhone 5 will sell for $199, $299 and $399 for the 16GB, 22GB and 64GB devices, respectively, with new carrier contracts. The iPhone 4S with 16GB device of memory drops to $99 with a new contract. The iPhone 4 with 8GB is now free on a new contract.

Pre-order sales start on Sept. 14. Apple said the new phones would start to ship on Sept. 21.


The iPhone 5 will have an LTE data connection -- also known as 4G -- and will be available through Verizon, Sprint, AT&T in the United States, as well as other carriers around the world.

The new phone will run Apple's iOS 6, which the company showed off in June at its Worldwide Developers Conference.

"iPhone 5 and iOS 6: the biggest things to happen to iPhone since the iPhone," said Apple CEO Tim Cook.

The iOS 6 has a range of new features, including Apple's own homebrewed maps app (which will replace Google Maps), Facebook integration and a new passbook app, which organizes airplane tickets, coupons and other passes users might have. Siri was also upgraded to launch apps, recommend movies, check on restaurant reservations and update your Facebook status.

The improved graphics will please everyone from the serious gamer to the average app user, said Apple executives. With 700,000 apps currently in the App Store, Apple said all apps have been updated to take advantage of the bigger screen and better graphics.

"The average customer is using more than 100 apps," said Cook.

YouTube is not preloaded with the new software, but Google has released a new iPhone YouTube app one can download.



Demand for the phone announced today was clearly high. Sites like Gazelle and Glyde, which buy older iPhones, have seen a huge surge in traffic over the last few days as people try to unload their phones before they switch to the new one. Some analysts predict the company could sell over 10 million phones in its first month on the market. Apple noted on its last earnings call that it saw a significant drop in iPhone sales in recent months as consumers waited for the new phone.
Subscribe to: Posts (Atom)
Copyright © 2013 futureX | Blogger Template by Clairvo