Your First Java Program

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What is Java?

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  What is Java? Java  is a high level, modern programming language designed in the early 1990s by Sun Microsystems, and currently owned by Oracle.  Java is  Platform Independent , which means that you only need to write the program once to be able to run it on a number of different platforms! Java is  portable ,  robust , and  dynamic , with the ability to fit the needs of virtually any type of application. More than  3 billion  devices run Java. Java is used to develop apps for Google's  Android  OS, various Desktop Applications, such as media players, antivirus programs, Web Applications, Enterprise Applications (i.e. banking), and many more! Notes  Learn, practice, and then join the huge community of Java developers around the world class  Simple{        public   static   void  main(String args[]){        System.out.print...
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What is Variable in JAVA ?

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  What is Variable in JAVA ? It is a name of storage space which is used to store data. It's value may be changed. It always contains last value stored to it. It is always declared with data type.      Variables  store data for processing. A variable is given a name (or  identifier ), such as area, age, height, and the like. The name uniquely identifies each variable, assigning a value to the variable and retrieving the value stored. Variables have  types . Some examples: -  int : for integers (whole numbers) such as 123 and -456 -  double : for floating-point or real numbers with optional decimal points and fractional parts in fixed or scientific notations, such as 3.1416, -55.66. -  String : for texts such as "Hello" or "Good Morning!". Text strings are enclosed within double quotes. You can declare a variable of a type and assign it a value. Example: String name = "David"; JAVA This creates a variable called  name  of type...
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Java Basic Syntax

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  Syntax of Java ? class Easy { public static void main(String[] args) { System.out.println( "Hello World" ); } } class 1.It is a keyword which is used to declare a class. 2. Keyword :The word which is predefined in the library is called keyword.for example class,void ,main etc. Easy 1.It is an userdefined class name. public 1.It is a keyword which is called access specifier/modifier. 2.It is used to provide accessibility of data member(variable) and member funation(function). static 1.It is a keyword. 2.It can be used with a variable or function or block,we will discuss it in next chapter. void 1.It is a keyword. 2.It indicates that there is no value is returning by the function. 3.If we use any other keyword like int,float,char etc in place of void then we will use  return  keyword. main() 1.It is the function which is called the entry point of any program. 2.The execution of any prgram starts from the main function. 3.If in a program there is only one f...
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