Thread: Please help with method return statement!

Im having trouble with my method return. I am new to using methods and cant seem to grasp the idea on the return part. I have to write a method that tells if a number is prime or not. This is what I have so far and it wont compile because it is saying "missing return statement } "... Please help!

import javax.swing.JOptionPane;
 
public  class IsPrimeMethod
{
	public  static  void    main(String []args)
	{
		String primeNum;
		int number;
		int i = 2;
 
		primeNum =
			JOptionPane.showInputDialog("Please enter a number: ");
		number = Integer.parseInt(primeNum);
 
		if(isPrime(number))
		{
			JOptionPane.showMessageDialog(null, "Your number is not prime");
		}
		else
		{
			JOptionPane.showMessageDialog(null, "Your number is prime");
		}
	}
	public static boolean isPrime(int number)
	{
		for(int i = 2; i < number; i++)
		{
		if(number % i == 0)
			return true;
 
		else
			return false;
		}
	}
}

Not sure I follow you, Norm. So there should only be one return statement?

--- Update ---

Should there not be a for loop in the method?

So I need to just add a guaranteed return statement and it will be fine? My coding is okay?

--- Update ---

I keep trying to add another return statement and cant seem to figure it out. Can you show me how or at least show me an example?

I keep trying to add another return statement . . .

Show what you tried.

Okay I got it to compile and run. However, now it always returns not prime. I think its because i set boolean notPrime = true; but, if I dont set it to anything it says that notPrime needs to be initialized. HELP lol

import javax.swing.JOptionPane;
 
public  class IsPrimeMethod
{
	public  static  void    main(String []args)
	{
		String primeNum;
		int number;
 
		primeNum =
			JOptionPane.showInputDialog("Please enter a number: ");
		number = Integer.parseInt(primeNum);
 
		if(isPrime(number))
		{
			JOptionPane.showMessageDialog(null, "Your number is not prime");
		}
		else
		{
			JOptionPane.showMessageDialog(null, "Your number is prime");
		}
	}
	public static boolean isPrime(int number)
	{
		boolean notPrime = true;
 
		for(int i = 2; i < number / 2; i++)
		{
			if(number % i == 0)
				notPrime = true;
			else
				return false;
		}
		return notPrime;
	}
}

--- Update ---

Never mind I had notPrime = true when it should have been false, duh! All fixed. What do you think of the final program?

import javax.swing.JOptionPane;
 
public  class IsPrimeMethod
{
	public  static  void    main(String []args)
	{
		String primeNum;
		int number;
 
		primeNum =
			JOptionPane.showInputDialog("Please enter a number: ");
		number = Integer.parseInt(primeNum);
 
		if(isPrime(number))
		{
			JOptionPane.showMessageDialog(null, "Your number is not prime");
		}
		else
		{
			JOptionPane.showMessageDialog(null, "Your number is prime");
		}
	}
	public static boolean isPrime(int number)
	{
		boolean notPrime = false;
 
		for(int i = 2; i <= number / 2; i++)
		{
			if(number % i == 0)
				notPrime = true;
			else
				return false;
		}
		return notPrime;
	}
}

Is my updated version OK? It seems to do what I need it to do...