Compiling & Running the Java Program

To compile Example.java program by the compiler javac, specify the name of the source file on the command line as

            C:\> javac Example.java

            Here, the Java compiler creates a file called Example.class that contain byte code version of the program.  The class file is run by the Java interpreter, called java by passing the name to command line argument as

            C:\> java Example

            O/P:     Hello

Example:         Write a program to read two values and print the values

class ex2

{

            public static void main(String[] args)

            {

                        System.out.println(args[0]);

                        System.out.println(args[1]);

            }

}

Primitive datatypes are to be converted into object type by using the wrapper classes.  Integer class is used as wrapper class for primitive datatype int.  parseInt( ) method converts string to an int.

Example:         Write a program to read two integer values and print the sum

class ex3

{

            public static void main(String[] args)

            {

            int a,b,sum;

            a=Integer.parseInt(args[0]);

            b=Integer.parseInt(args[1]);

            sum=a+b;

            System.out.println("sum of a and b is"+sum);

            }

}