Java Program Structure
In this chapter, we will discuss high level java program structure, Compile and run
a simple program.

In java , Program can be defined using keyword "class". A Class starts and ends with curly braces. 

 
  class < ProgramName >  {      // Start of the class/program
        ..
        ..

  }   // end of the class.


Within class we may have main() function/method , where actual execution starts
when we run Java Program/Class.

 

   class  < ProgramName > {

     public static void main(String[] args)  {        // Start of method
 
         statement 1;                                // statements ends with semicolon
         statement 2;
         ..
         ..
         statement n;

    }

 } 

Compile and Run Sample Java Program
Here is the sample Hello World Program which will display the String to console.


Click here for java source code.

Save above program with name MyFirstProgram.java
open command line prompt and compile it with javac command as shown below.



Run the java program using Java command as shown below.



After executing the MyFirstProgram, it will display following two lines from main() method.


    This is my first program

    Welcome to Java World