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 :confused:

Code Java:

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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();
	}
}

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Thank you (*)

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

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

instantiate a new temperature object in your main(), and it should work.

Code :

---

    public static void main(String[] args) throws java.io.IOException
    {
        System.out.println("Welcome to the temperature converter");
        temperatureConverterMenu t = new temperatureConverterMenu();
        t.menu();
    }

---

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

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