Basic Programming:- Firts java Program

Programming Basics:

public static void main(String args[ ])

publicàaccess specifier

static àtype of method

void à return type of main()

static means it will be loaded to main memory when class is loaded

String args [ ] à String  array

{Note: - args is default name; we can change it as per the requirement}

String aa[ ] & String [ ] args is also correct.

We have System.out.println(); method

System- It is class present in java.lang Package.

i.e.:

public final class System

{

                        static PrintStream out;

}

PrintStream class hasthe following overloaded insatance methods:

print(byte);                                          

print(short);

print(int);

print(float);

print(long); 

print(double);

print(char);

print(boolean);

print(String);

                        similarly, in this class, 9 println() methods are available.

Simple Program:

Class FirstJavaProgram

{

            Public static void main(String args[])

            {

            System.out.println(“This is my First Program”);

}

}

For saving the Java application -      FirstJavaProgram.java

For compilation -                                javac FirstJavaProgram.java

For execution-                                                java FirstJavaProgram