non-static and variable errors

[nabil1983]

Hello

Everytime i compile this i keep getting an error on non-static method can not bu passed to static method, i understand that. But how can i get around this, without making the non-static method static , because it has variable relating to otha methods ... i also keep getting an array error for the variables userTime & i .

Can neone help me one this one please its very vital im almost done here..

Thanks For Ne Help Given In Advance

import java.util.Vector;
import java.io.*;


public class Schedule
{
		Vector ch1Time  = new Vector();
		Vector ch2Time  = new Vector();
		
	public static void main (String args[])
	{
		mainMenu();
		
	}
	

	public void mainMenu()
	{
		int choice1 = 0;
	
		do
		{
		System.out.println("************* CHANNEL ONE MENU *************");
		System.out.println("ENTER 1 TO ADD PROGRAMMES TO CHANNEL ONE");
		System.out.println("ENTER 2 TO REMOVE PROGRAMMES FROM CHANNEL ONE");
		System.out.println("ENTER 3 TO FIND EMPTY SPACE IN CHANNEL ONE");
		System.out.println("ENTER 4 TO ADD PROGRAMMES TO CHANNEL TWO");
		System.out.println("ENTER 5 TO REMOVE PROGRAMMES FROM CHANNEL TWO");
		System.out.println("ENTER 6 TO FIND EMPTY SPACE IN CHANNEL TWO");
		System.out.println("ENTER 0 TO EXIT MENU");
		
		
			try
			{
				BufferedReader reader;
				reader = new BufferedReader(new InputStreamReader(System.in));
				String i = reader.readLine();
				choice1 = Integer.parseInt(i);
				
	
				if(choice1==1)
				{
					addProgrammesCH1();
				}
			
				else if (choice1==2)
				{
					removeProgrammesCH1();			
				}
				
				else if (choice1==3)
				{
				//	checkCH1();			
				}
				
				else if(choice1==4)
				{
				//	addProgrammesCH2();
				}
			
				else if (choice1==5)
				{
				//	removeProgrammesCH2();			
				}
				
				else if (choice1==6)
				{
				//	checkCH2();			
				}
				
				else if (choice1==0)
				{
					System.exit(0);			
				}
					
			}
	
			catch (IOException e)
			{
				System.out.println(e);
			}
		
		}while(choice1!=0);
	}

	
	public void addProgrammesCH1()
	{
		int choice2 =0;
		int userTime;
		do				
		{

			System.out.println("********** ADD TO CHANNEL ONE **********");
			System.out.println("ENTER 1 TO CHOOSE A DAY AND TIME");
		//	System.out.println("ENTER 2 TO CHOOSE A TIME");
			System.out.println("ENTER 3 TO CHOOSE A PROGRAM");
			System.out.println("ENTER 4 TO GO TO MAIN MENU");
			System.out.println("ENTER 0 TO EXIT MENU");

			
			try
			{
				
				BufferedReader reader;
				reader = new BufferedReader(new InputStreamReader(System.in));
	
				choice2 = Integer.parseInt(reader.readLine());
				
		
				if(choice2==1)
				{
					schDay();
				}
			
			/*	else if (choice2==2)
				{
					schTime();			
				}
					*/			
				else if (choice2==3)
				{
			//		schProgram();
				}
				
				else if (choice2==4)
				{
					mainMenu();
				}
				
				else if (choice2==0)
				{
					System.exit(0);			
				}
			}
			catch (Exception e)
			{
				System.out.println(e);
			}
		
		}while(choice2!=0);	
	}
	
	public void schDay()
	{
		int choice2 =0;

		do				
		{

			System.out.println("********** ADD TO CHANNEL ONE **********");
			System.out.println("ENTER 1 TO ADD TO SUNDAY");
			System.out.println("ENTER 2 TO ADD TO SUNDAY");
			System.out.println("ENTER 3 TO ADD TO SUNDAY");
			System.out.println("ENTER 4 TO ADD TO SUNDAY");
			System.out.println("ENTER 5 TO ADD TO SUNDAY");
			System.out.println("ENTER 6 TO ADD TO SUNDAY");
			System.out.println("ENTER 7 TO ADD TO SUNDAY");
			System.out.println("ENTER 0 TO EXIT MENU");



		ch1Time.insertElementAt(" 6:00",0);
		ch1Time.insertElementAt(" 6:30",1);
		ch1Time.insertElementAt(" 7:00",2);
		ch1Time.insertElementAt(" 7:30",3);
		ch1Time.insertElementAt(" 8:00",4);
		ch1Time.insertElementAt(" 8:30",5);
		ch1Time.insertElementAt(" 9:00",6);
		ch1Time.insertElementAt(" 9:30",7);
		ch1Time.insertElementAt(" 10:00",8);
		ch1Time.insertElementAt(" 10:30",9);
		ch1Time.insertElementAt(" 11:00",10);
		ch1Time.insertElementAt(" 11:30",11);
		ch1Time.insertElementAt(" 12:00",12);
		ch1Time.insertElementAt(" 12:30",13);
		ch1Time.insertElementAt(" 13:00",14);
		ch1Time.insertElementAt(" 13:30",15);
		ch1Time.insertElementAt(" 14:00",16);
		ch1Time.insertElementAt(" 14:30",17);
		ch1Time.insertElementAt(" 15:00",18);
		ch1Time.insertElementAt(" 15:30",19);
		ch1Time.insertElementAt(" 16:00",20);
		ch1Time.insertElementAt(" 16:30",21);
		ch1Time.insertElementAt(" 17:00",22);
		ch1Time.insertElementAt(" 17:30",23);
		ch1Time.insertElementAt(" 18:00",24);
		ch1Time.insertElementAt(" 18:30",25);
		ch1Time.insertElementAt(" 19:00",26);
		ch1Time.insertElementAt(" 19:30",27);
		ch1Time.insertElementAt(" 20:00",28);
		ch1Time.insertElementAt(" 20:30",29);
		ch1Time.insertElementAt(" 21:00",30);
		ch1Time.insertElementAt(" 21:30",31);
		ch1Time.insertElementAt(" 22:00",32);
		ch1Time.insertElementAt(" 22:00",33);
		ch1Time.insertElementAt(" 23:00",34);
		ch1Time.insertElementAt(" 23:00",35);	

			try
			{
				
				BufferedReader reader;
				reader = new BufferedReader(new InputStreamReader(System.in));
	
				choice2 = Integer.parseInt(reader.readLine());


				if(choice2==1)
			{

	/*	for(int i = 0; i<ch1Time.size(); i++)
		{
			if(userTime.equals(ch1Time.elementAt(i))
			{
				
				return i;
			}		
		}*/

				schTime();
				}
			
				else if (choice2==2)
				{
				//
				}
								
				else if (choice2==3)
				{
				//
				}
				
				else if (choice2==4)
				{
				//			
				}
								
				else if (choice2==5)
				{
			//		
				}
				else if (choice2==6)
				{
				//			
				}
								
				else if (choice2==7)
				{
			//		
				}
				else if (choice2==0)
				{
					System.exit(0);			
				}
			}
			catch (Exception e)
			{
				System.out.println(e);
			}
		
		}while(choice2!=0);			
	}
	
	public void schTime()
	{
		System.out.println("ENTER TIME : ");

		try
		{
				
			BufferedReader reader;
			reader = new BufferedReader(new InputStreamReader(System.in));

			userTime = Integer.parseInt(reader.readLine());
			
			if(userTime.equals(ch1Time.elementAt(i)))
			{
				ch1Time.elementAt(i)= "";
				ch1Time.remove(i);
				ch1Time.insertElementAt("",i);
			}
			else
			{
				System.out.println(" Time is not available");
			}
		}
	
			catch (Exception e)
			{
				System.out.println(e);
			}

	}
		

	public void removeProgrammesCH1()
	{
		
	}
	
}

[DeepZ]

The easiest way for this, and i think the most used, is to create an instance of your class and run the methods using that.

So it would be something like :

public class Schedule {

 Vector ch1Time  = new Vector();
 Vector ch2Time  = new Vector();
 
//Default constructor
public Schedule() {
}
  
	public static void main (String args[]) {
 
Schedule mySchedule = new Schedule();

mySchedule.mainMenu();
		
	}

etc.

Hope this helps.

[nabil1983]

Thanks.
i changed the code to this::

public class Schedule
{
		Vector ch1Time  = new Vector();
		Vector ch2Time  = new Vector();
                          int userTime;
		
	public static void main (String args[])
	{
		new Schedule().mainMenu();
		
	}
	

	public void mainMenu()
	{
		int choice1 = 0;

and it seemed to work, but now my only problem is the variable i problems that keep coming up..

Declaring it as a global variable does not seem to work..
Got ne ideas on this one...

[jwenting]

always use the absolute minimum scope for variables that you can. NEVER EVER use globals unless there's really no way around it (and if there isn't your design is likely flawed).

[DeepZ]

If your method2 needs to work on data in a variable defined/declared (or whatever) in method1 you need to pass it as a argument.

JWenting is right though, have a look at your design. It looks like the Schedule object is the heart. So decide which data values are making up that object (like time, day, film tec.) and make these data-elemenst instance variables (like ch1Time and ch2Time are now). This will make them available to all instance methods.

Then if method2 needs to work on variable i declared/initialised in method1 you need to do something like :

method2(i);

in your method1 and declare method2 as method2(int i) or whatever the variable type is.

Hope this helps,
Guido