no main method found

[Tom Orr]

I am getting an error message stating I have no main when I run. It compiles OK. I have a main but it says I dont. Thanks ahead of time for any help.

import java.util.Scanner;
import java.util.Random;
public class Die 
{
	Scanner keyboard = new Scanner (System.in);
	Random generator = new Random();
	int faceValue;												
	int randomInteger;
	char repeat = 'y';
	
	
public void main (String [] args)    					// begin main method
{
 		Die myDie = new Die();
		int sides = myDie.setSide();
																		
	do{	randomInteger = myDie.roll(sides);
			System.out.print("You rolled a " + myDie.getFaceValue(randomInteger) + ".  Would you like to roll again? y or n?");
			String input = keyboard.next();
			repeat = input.charAt(0);						// goes back to the while statement if the user inputs y
		}while (repeat == 'y');
}

public int setSide()
{
System.out.print("How many sides does your die have?");
int sides = keyboard.nextInt();
return sides;
}

public int roll(int sides)
{
randomInteger = generator.nextInt(sides) + 1;
return randomInteger;
}

public int getFaceValue(int randomInteger)
{
faceValue = randomInteger;
return faceValue;
}
}

[Matthew Brown]

The JVM is looking for a method public static void main (String[]) - exactly. You're missing a word.

[Tom Orr]

OK so I have started over and this is what I have. I now need to know how to create an object of Dice with Die1 and Die2.
would I just start with
Dice Die1 = new Dice();
Dice Die2 = new Dice();

Here is where I would need to assign the value to Die1 and Die2 for the setUpperFace and Im not sure how to do that.

import java.util.*; 														// Imports scanner and random utilities
public class Die2 
{
public static void main (String [] args) 							// begin main method 
	{  
		int UpperFace = setUpperFace();
		System.out.println("your first die roll is " + Die1.getUpperFace + "your second die is a " + Die2.GetUpperFace);
	}	
																				
public static int Roll() 												// begins method to generate a random number
	{ 
		Random generator = new Random();								// initiates the random generator
		int number = generator.nextInt(6) + 1; 					// generates a random number between 1 and n
		return number;														// returns random number to the main method		
	}																			// ends method generating random number 
		
public static int setUpperFace()
	{
		int UpperFace = Roll();
		return UpperFace;
	}


public static int getUpperFace()
	{		
		return UpperFace;
	}

[Matthew Brown]

I must admit, I'm a bit confused as to exactly what you're trying to do here. Some issues:

- If you want to use new Dice(), you need a Dice class. Where is it?

- If the Die2 class is supposed to represent a die, so that you can create several of them, then why are all the methods static? The class should have a non-static state (a private int upperFace would be fine), and then I'd expect most of the methods to refer to that state.

- You have (twice) declared UpperFace as a method-local variable, but then you're trying to refer to it in getUpperCase(). It's not visible there.

- You aren't consistent with your use of capitalisation. Following Java conventions, methods and variables should start with a lower-case letter

Here's one way of defining a simple Die class that could be used by your main class:

class Die {
    private static Random generator = new Random();
    private int upperFace;
    
    public int getUpperFace() {
        return upperFace;
    }
    
    public void setUpperFace(int upperFace) {
        this.upperFace = upperFace;
    }
    
    public int roll() {
        int number = generator.nextInt(6) + 1;
        setUpperFace(number);
        return number;
    }
}

[Tom Orr]

Yes I realize I am not understanding this very well. Thanks for your help. I am hoping that things start clicking for me soon.

Here is what I have after the suggestions. Still now working as I expected. If you could point out my errors again I will keep trying.

import java.util.*; 									// Imports scanner and random utilities 
public class Dice
 {
public static void main (String [] args) 		// begin main method 
	{ 
		Dice Die1 = new Dice();
		Dice Die2 = new Dice();
		
		int UpperFace = setUpperFace(); 
		System.out.println("your first die roll is " + Die1.getUpperFace() + "your second die is a " + Die2.getUpperFace());
 	} 

public static int setUpperFace() 
 	{ 
		int random = Roll(); 
		return random; 
	} 

public static int Roll() 								// begins method to generate a random number 
 	{
  		Random generator = new Random(); 			// initiates the random generator 
 		int number = generator.nextInt(6) + 1; 	// generates a random number between 1 and n 
 		return number; 									// returns random number to the main method 
	 } 														// ends method generating random number 
 		
public static int getUpperFace() 
 	{		 
 		return UpperFace; 
	}
}

[marc weber]

I think the main method issue is resolved. Please continue the other logic questions in this parallel thread...

https://coderanch.com/t/533914/java/java/Variables-assigned-objects