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Thread: Non-Static variables

  1. #1
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    Smile Non-Static variables

    Right, I'm doing some university work, and I've got this message a few times but it just isn't going away with this program. Can someone please help with the static and non-static referencing for variables please? I have looked at the other posts in reference to this problem and it's still not helping with this piece of code
    import java.util.*;
     
    public class temperatureConverterMenu
    {
    	public Scanner sc = new Scanner(System.in);
     
    	char choice;
    	double centigrade, farenheit;
     
    	public void menu()
    	{
    		Scanner sc = new Scanner(System.in);
     
    		System.out.println("Please choose from the following menu...");
    		System.out.println("To enter a centigrade value to convert to farenheit enter 1");
    		System.out.println("To enter a farenheit value to convert to centigrade enter 2");
    		System.out.println("Please enter -1 to quit the program");	
    		System.out.println("------------- * -------------");
     
    		choice = sc.next().charAt(0);
     
    		do{
     
    			switch (choice)
    			{
    				case '1':
    				{
    					System.out.println("You have chosen centigrade to farenheit");
    					System.out.println("Please enter your centigrade value:");
     
    					centigrade = sc.nextDouble();
    					centigradeToFarenheit(centigrade);
    					break;
    				}
     
    				case '2':
    				{
    					System.out.println("You have chosen farenheit to centigrade");
    					System.out.println("Please enter your farenheit value:");
     
    					farenheit = sc.nextDouble();
    					farenheitToCentigrade(farenheit);
    					break;
    				}
     
    				default:
    					System.out.println("You did not enter a menu option...");
    					break;
    			}
     
    		} while(choice != -1);
     
    	}
     
    	// centigrade to farenheit
    	public void centigradeToFarenheit(double centigrade)
    	{
    		double Faren;
     
    		Faren = (centigrade*9)/5;
    		System.out.println(centigrade+"C is "+Faren+"F");
     
    		//return Faren;
    	}
     
    	//farenheit to centigrade
    	public void farenheitToCentigrade(double farenheit)
    	{
    		double Cent;
     
    		Cent = (farenheit*5)/9;
    		System.out.println(farenheit+"F is "+Cent+"C");	
     
    		//return Cent;
    	}
     
    	public static void main(String[] args) throws java.io.IOException
    	{
    		System.out.println("Welcome to the temperature converter");
     
    		menu();
    	}
    }

    Thank you
    Last edited by helloworld922; December 30th, 2010 at 02:00 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Non-Static variables

    In the future, please surround your code with highlight tags.

    See: Common Java mistakes - Referencing Non-static variables/methods in a static way

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    liloka (December 30th, 2010)

  4. #3
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    Default Re: Non-Static variables

    instantiate a new temperature object in your main(), and it should work.
        public static void main(String[] args) throws java.io.IOException
        {
            System.out.println("Welcome to the temperature converter");
            temperatureConverterMenu t = new temperatureConverterMenu();
            t.menu();
        }

  5. The Following User Says Thank You to JavaHater For This Useful Post:

    JavaPF (December 31st, 2010)

  6. #4
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    Smile Re: Non-Static variables

    u simply have to make instance of your class and use that class instance dot this method like..

    temperatureConverterMenu temp = new temperatureConverterMenu();
    temp.menu();

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