Welcome to Dave's Tech

Program Phase 1-1 Java

//***********************************************************************************
// Program Phase 1-1 Java Hello World! with Strings
// Programming Tasks Illustrated: Console Application
//                                Integer and String Variable Declarations
//                                Application Command Line Parameters
//                                Case/Switch Statement
//                                String Literal Assignment and Concatenation
//                                Console Application Standard Output
//***********************************************************************************


//***********************************************************************************
// File: pp1_1.java
// Reserved
//***********************************************************************************

package programphases.programphase1_1;

public class pp1_1
{ 


//***********************************************************************************
// Program Phase 1-1 Main
// Define the Entry Point of Execution (EPE) for Program Phase 1-1
// CBI:  1-1.1.1.1
//***********************************************************************************

public static void main(final String argv[])
{


//***********************************************************************************
// Program Phase 1-1 Main
// Declare the local variables for the "main" program
// CBI:  1-1.1.1.2
//***********************************************************************************
 
   int lnCmdLineParamCount; 
   String lcString1;
   String lcString2;
   String lcStringOutput1;
   String lcStringOutput2;


//***********************************************************************************
// Program Phase 1-1 Main
// Store the command line parameters
// CBI:  1-1.1.1.3
//***********************************************************************************

   // The local argv array stores the command line parameters.
   lnCmdLineParamCount = argv.length; 


//***********************************************************************************
// Program Phase 1-1 Main
// Parse the command line parameters using a Case/Switch statement
// CBI:  1-1.1.1.4
//***********************************************************************************

   switch (lnCmdLineParamCount)
   {
      case 0:
         lcStringOutput1 = "You entered no command line parameters.";
         break; 

          
      case 1:
         lcStringOutput1 = "Command line parameter entered: " + argv[0];
         break;
       
      default:
         lcStringOutput1 = "The command line is limited to 1 parameter.";
   }


//***********************************************************************************
// Program Phase 1-1 Main
// Concatenate two string variables
// CBI:  1-1.1.1.5
//***********************************************************************************

   lcString1 = "Hello";
   lcString2 = "World!";
   lcStringOutput2 = lcString1 + " " + lcString2; 


//***********************************************************************************
// Program Phase 1-1 Main
// Output to standard output
// CBI:  1-1.1.1.6
//***********************************************************************************

   System.out.println(lcStringOutput1);
   System.out.println(lcStringOutput2); 
}}