[Tutorial] Learn Java Programming

sudo apt-get install openjdk-7-jre eclipse
[password]

su
 [password]
 yum install openjdk-7-jre eclipse

[FONT=Times New Roman][SIZE=3]/* 
Author:  buckyaustin
Date:      06/10/2013[/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]Purpose: To present user with a menu. And display them output[/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]Version:  Version 1[/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]*/[/SIZE][/FONT]
 
[FONT=Times New Roman][SIZE=3]public class CurrencyConverter[/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]{//start of class[/SIZE][/FONT][INDENT] [FONT=Times New Roman][SIZE=3]public static void main(String [] args) [/SIZE][/FONT] 
[/INDENT]
[INDENT][FONT=Times New Roman][SIZE=3]{//start of main method
[/SIZE][/FONT]
[/INDENT]
[INDENT=2] [FONT=Times New Roman][SIZE=3]//lets display an attractive title to our program[/SIZE][/FONT][/INDENT]
[INDENT]  [FONT=Times New Roman][SIZE=3]        System.[I]out[/I].println("\t\t Currency Converter!");

[/SIZE][/FONT][/INDENT]
[INDENT=2] [FONT=Times New Roman][SIZE=3]//Display the menu for the user to choose from.[/SIZE][/FONT]
[/INDENT]
[INDENT]  [FONT=Times New Roman][SIZE=3]        System.[I]out[/I].print("1: \t Convert to US Dollar." +[/SIZE][/FONT][/INDENT]
[INDENT=3]             [FONT=Times New Roman][SIZE=3]"2: \t Convert to AUS Dollar." +[/SIZE][/FONT]
[/INDENT]
[INDENT=4]     [FONT=Times New Roman][SIZE=3]"3: \t Convert to STG. \n");

[/SIZE][/FONT]
[/INDENT]
[INDENT][FONT=Times New Roman][SIZE=3]}//end of main method[/SIZE][/FONT]
[/INDENT]
[FONT=Times New Roman][SIZE=3]}//end of class[/SIZE][/FONT]
[COLOR=#000000]
[/COLOR]

/* Author:   buckyaustin
    Date:      07/10/2013
    Purpose:    To present user with a menu. Respond to their choice accordingly
    Version:  Version 2
    Update Log: Added two variables, if else and switch statements.
*/


//importing the Scanner class from java/util folder.
import java.util.Scanner;


public classCurrencyConverterV2 
{//start of class
    public static void main(String[] args) 
    {//start of main method
        
        //creating a variable to store the users choice
        int choice = 0;


        //creating a variable of the amount the users wants converted
        double euroAmount = 0.0;


        //an instantiation of the Scanner class
        Scanner keyboardIn = newScanner(System.in);


        //lets display an attractive title to our program
        System.out.println("\t\tCurrency Converter!");


        
        //asking the user for the amount to convert
        System.out.print("How much do you want convert? ");


        //Storing this in euroamount using our new scanner class
        euroAmount =keyboardIn.nextDouble();


        
        //Display the menu for the user to choose from.
        System.out.print("1:\t Convert to US Dollar." +
                         "2: \tConvert to AUS Dollar." +
                         "3: \t Convertto STG. \n");


        //an if statement that looks at the users choice and acts dependent on that.
        if (choice == 1) 
        {//start of if
            System.out.println("USDollar conversion chosen");
        }//end of if
 

        else if(choice == 2) 
        {//start of else
            System.out.println("AUSDollar conversion chosen");
        }//end of else


        else if(choice == 3) 
        {//start of else
            System.out.println("STGconversion chosen");
        }//end of else


        else
        {//start of else
            System.out.println("Invalid Choice made");
        }//end of else



        
        //a switch statement that looks at the users choice and acts dependent on that
        switch (choice) 
        {//start of switch


        case1:    System.out.println("US Dollar conversion chosen");
            break;
        case 2:   System.out.println("AUS Dollar conversion chosen");
            break;
        case 3:   System.out.println("STG conversion chosen");
            break;

        default:  System.out.println("Invalid Choice made");
            break;
        }//end of switch


        
        /*notice how switches are smaller?
         * The switch and if else do the same thing.
         * They are called conditional statements.
         */


    }//end of main method
}//end of class