Java || Whats My Name? – Practice Using Strings, Methods & Switch Statemens

June 05, 2012 admin No comments

Here is another actual homework assignment which was presented in an intro to programming class. This program highlights more use using strings, modules, and switch statements.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

How To Get String Input If/Else Statements Methods (A.K.A "Functions") - What Are They? Switch Statements - How To Use Them Equal - String Comparison

This program first prompts the user to enter their name. Upon receiving that information, the program saves input into a string called “firstName.” The program then asks if the user has a middle name. If they do, the user will enter a middle name. If they dont, the program proceeds to ask for a last name. Upon receiving the first, [middle], and last names, the program will append the first, [middle], and last names into a completely new string titled “fullName.” Lastly, if the users’ first, [middle], or last names are the same, the program will display that data to the screen via stdout. The program will also display to the user the number of characters their full name contains using the built in function “length.”





		
		
			Whats My Name?
			
Java
			
			import java.util.Scanner;

public class NameString
{
   // global variable declaration	
   static Scanner cin = new Scanner(System.in);  
   
   public static void main(String[] args)
   {
	   // declare variables
	   char response = ' '; 
	   String firstName= "";
	   String fullName="";
	   
	   // display message to screen
	   System.out.println("nWelcome to My Programming Notes' Java Program.");
	   
	   // get first name from user
	   System.out.print("Please enter your first name: ");
	   firstName = cin.next();	
	   
	   System.out.print("nDo you have a middle name?(Y/N): ");
	   String choice = cin.next();
	   choice = choice.toUpperCase();
	   response = choice.charAt(0);
	   
	   // use a switch statement to detrmine which function will be called
	   switch(response)
	   {
	    	case 'Y':
	   		fullName = FirstMiddleLast(firstName); // method declaration
	   		break;
	    	case 'N':
	   		fullName = FirstLast(firstName); // method declaration
	   		break;
	    	default:
	   		System.out.print("nPlease press either 'Y' or 'N'n"
	   			+ "Program exiting...n");
	   		System.exit(1);
	   		break;	   				
	   }
	   
	   System.out.println("And your full name is "+fullName);	   
   }// end of main
   
   // ==== FirstMiddleLast ====================================================
   //
   // This module will take as input the first name, and prompt the user for 
   // their middle and last name. Then it will display the total number of 
   // characters in their name. It returns the full name back to main  
   //
   // =========================================================================  
   private static String FirstMiddleLast(String firstName) 
   {
	   String middleName="";
	   String lastName="";
	   String fullName="";
	   
	   System.out.print("nPlease enter your middle name: ");	   
	   middleName = cin.next();
	   
	   System.out.print("Please enter your last name: ");
	   lastName = cin.next(); 
	   
	   // copy the contents from the 3 strings into the 'fullName' string
	   fullName = firstName+" "+middleName+" "+lastName;
	   
	   System.out.println("");
	   
	   // check to see if the first, middle or last names are the same
	   // if they are, display a message to the user
	   if(firstName.equals(middleName))
	   {
	      System.out.print("tYour first and middle name are the samen");
	   }
	   if(middleName.equals(lastName))
	   {
	      System.out.print("tYour middle and last name are the samen");
	   }	
	   if(firstName.equals(lastName))
	   {
	      System.out.print("tYour first and last name are the samen");
	   }
	   
	   // display the total length of the string, minus the 2 white spaces
	   System.out.println("nThe total number of characters in your "
			   +"name is: "+(fullName.length()-2));
	   
	   // return the full name string to main
	   return fullName;
   }// end of FirstMiddleLast
   
   // ==== FirstLast ==========================================================
   //
   // This module will take as input the first name, and prompt the user for
   // their last name. Then it will display the total number of characters in
   // their name. It returns the full name back to main  
   //   
   // ============================================================================   
   private static String FirstLast(String firstName) 
   {
	   String lastName="";
	   String fullName="";
	   
	   System.out.print("nPlease enter your last name: ");
	   lastName = cin.next(); 
	   
	   // copy the contents from the 3 strings into the 'fullName' string
	   fullName = firstName+" "+lastName;
	   
	   System.out.println("");
	   
	   // check to see if the first or last names are the same
	   // if they are, display a message to the user
	   if(firstName.equals(lastName))
	   {
	      System.out.print("tYour first and last name are the samen");
	   }
	   
	   // display the total length of the string, minus the white space
	   System.out.println("nThe total number of characters in your "
			   +"name is: "+(fullName.length()-1));
	   
	   // return the full name string to main
	   return fullName;
   }// end of FirstLast   
}// http://programmingnotes.org/
			
				
					
				
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						import java.util.Scanner;
 
public class NameString
{
   // global variable declaration	
   static Scanner cin = new Scanner(System.in);  
   
   public static void main(String[] args)
   {
	   // declare variables
	   char response = ' '; 
	   String firstName= "";
	   String fullName="";
	   
	   // display message to screen
	   System.out.println("nWelcome to My Programming Notes' Java Program.");
	   
	   // get first name from user
	   System.out.print("Please enter your first name: ");
	   firstName = cin.next();	
	   
	   System.out.print("nDo you have a middle name?(Y/N): ");
	   String choice = cin.next();
	   choice = choice.toUpperCase();
	   response = choice.charAt(0);
	   
	   // use a switch statement to detrmine which function will be called
	   switch(response)
	   {
	    	case 'Y':
	   		fullName = FirstMiddleLast(firstName); // method declaration
	   		break;
	    	case 'N':
	   		fullName = FirstLast(firstName); // method declaration
	   		break;
	    	default:
	   		System.out.print("nPlease press either 'Y' or 'N'n"
	   			+ "Program exiting...n");
	   		System.exit(1);
	   		break;	   				
	   }
	   
	   System.out.println("And your full name is "+fullName);	   
   }// end of main
   
   // ==== FirstMiddleLast ====================================================
   //
   // This module will take as input the first name, and prompt the user for 
   // their middle and last name. Then it will display the total number of 
   // characters in their name. It returns the full name back to main  
   //
   // =========================================================================  
   private static String FirstMiddleLast(String firstName) 
   {
	   String middleName="";
	   String lastName="";
	   String fullName="";
	   
	   System.out.print("nPlease enter your middle name: ");	   
	   middleName = cin.next();
	   
	   System.out.print("Please enter your last name: ");
	   lastName = cin.next(); 
	   
	   // copy the contents from the 3 strings into the 'fullName' string
	   fullName = firstName+" "+middleName+" "+lastName;
	   
	   System.out.println("");
	   
	   // check to see if the first, middle or last names are the same
	   // if they are, display a message to the user
	   if(firstName.equals(middleName))
	   {
	      System.out.print("tYour first and middle name are the samen");
	   }
	   if(middleName.equals(lastName))
	   {
	      System.out.print("tYour middle and last name are the samen");
	   }	
	   if(firstName.equals(lastName))
	   {
	      System.out.print("tYour first and last name are the samen");
	   }
	   
	   // display the total length of the string, minus the 2 white spaces
	   System.out.println("nThe total number of characters in your "
			   +"name is: "+(fullName.length()-2));
	   
	   // return the full name string to main
	   return fullName;
   }// end of FirstMiddleLast
   
   // ==== FirstLast ==========================================================
   //
   // This module will take as input the first name, and prompt the user for
   // their last name. Then it will display the total number of characters in
   // their name. It returns the full name back to main  
   //   
   // ============================================================================   
   private static String FirstLast(String firstName) 
   {
	   String lastName="";
	   String fullName="";
	   
	   System.out.print("nPlease enter your last name: ");
	   lastName = cin.next(); 
	   
	   // copy the contents from the 3 strings into the 'fullName' string
	   fullName = firstName+" "+lastName;
	   
	   System.out.println("");
	   
	   // check to see if the first or last names are the same
	   // if they are, display a message to the user
	   if(firstName.equals(lastName))
	   {
	      System.out.print("tYour first and last name are the samen");
	   }
	   
	   // display the total length of the string, minus the white space
	   System.out.println("nThe total number of characters in your "
			   +"name is: "+(fullName.length()-1));
	   
	   // return the full name string to main
	   return fullName;
   }// end of FirstLast   
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output
Note: The code was compiled five separate times to display the different outputs its able to produce

====== RUN 1 ======
Welcome to My Programming Notes' Java Program. Please enter your first name: My Do you have a middle name?(Y/N): y Please enter your middle name: Programming Please enter your last name: Notes The total number of characters in your name is: 18 And your full name is My Programming Notes ====== RUN 2 ====== Welcome to My Programming Notes' Java Program. Please enter your first name: Programming Do you have a middle name?(Y/N): n Please enter your last name: Notes The total number of characters in your name is: 16 And your full name is Programming Notes ====== RUN 3 ====== Welcome to My Programming Notes' Java Program. Please enter your first name: Notes Do you have a middle name?(Y/N): y Please enter your middle name: Notes Please enter your last name: Notes Your first and middle name are the same Your middle and last name are the same Your first and last name are the same The total number of characters in your name is: 15 And your full name is Notes Notes Notes ====== RUN 4 ====== Welcome to My Programming Notes' Java Program. Please enter your first name: My Do you have a middle name?(Y/N): n Please enter your last name: My Your first and last name are the same The total number of characters in your name is: 4 And your full name is My My ====== RUN 5 ====== Welcome to My Programming Notes' Java Program. Please enter your first name: My Do you have a middle name?(Y/N): z
Please press either 'Y' or 'N' Program exiting...

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Posted in: Console, Java Tags: functions, if/else, java, string, switch

Java || Whats My Name? – Practice Using Strings, Methods & Switch Statemens

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